From 7ee8919d3912ea2e5376f3d4c2888e9f6134c70f Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 20:08:11 +0900
Subject: [PATCH 01/12] tested UDP and TCP -> It is better TCP on my
 environment

tested UDP and TCP -> It is better TCP on my environment
- case of UDP
Ok, Host -> Client communication
Broken, Client -> Host communication
- case of TCP
Ok, bi-direction, Host -> Client and Client <- Host
---
 .../ESP32-Serial-WiFi-Client.ino                     |  3 ++-
 ESP32-Serial-WiFi-Client/client_config.h             | 12 +++++++-----
 config.h                                             |  8 ++++----
 3 files changed, 13 insertions(+), 10 deletions(-)

diff --git a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
index c8c58bd..ceee4f6 100644
--- a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
+++ b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
@@ -152,7 +152,8 @@ void loop() {
 #ifdef PROTOCOL_TCP
     if (num > 0) client.write(buf, num);
 #elif defined(PROTOCOL_UDP)
-    udp.broadcastTo(buf, num, HOST_PORT + 1);
+    //udp.broadcastTo(buf, num, HOST_PORT + 1);
+    udp.broadcastTo(buf, num, HOST_PORT);
 #endif
     num = 0;
 }
diff --git a/ESP32-Serial-WiFi-Client/client_config.h b/ESP32-Serial-WiFi-Client/client_config.h
index 7c6220c..c61bc27 100644
--- a/ESP32-Serial-WiFi-Client/client_config.h
+++ b/ESP32-Serial-WiFi-Client/client_config.h
@@ -13,20 +13,22 @@
 
 #define OTA_HANDLER        // uncomment to enable OTA programming
 
-#define SSID   "ssid"      // SSID to join
-#define PASSWD "password"  // wiFi password
+#define SSID   "ssid_esp_uart_bridge"      // SSID to join
+#define PASSWD "password_esp_uart_bridgeAAAA"  // wiFi password
 
 #define BUFFERSIZE 1024
 
 #define VERSION "2.0-ESP32"
 
-#define PROTOCOL_UDP                       // PROTOCOL_TCP or PROTOCOL_UDP
+#define PROTOCOL_TCP                       // PROTOCOL_TCP or PROTOCOL_UDP
+//#define PROTOCOL_UDP                       // PROTOCOL_TCP or PROTOCOL_UDP
 #define HOST_IP IPAddress(192, 168, 4, 1)  // only used for PROTOCOL_TCP
-#define HOST_PORT 14550                    // TCP or UDP port
+//#define HOST_PORT 14550                    // UDP port
+#define HOST_PORT 8880                    // TCP port
 #define CLIENT_BAUD 115200
 #define CLIENT_PARAM SERIAL_8N1
 #define CLIENT_TXPIN 1
-#define CLIENT_RXPIN 3
+#define CLIENT_RXPIN 21
 
 /**************************  DO NOT EDIT BELOW HERE **************************/
 // perhaps a clever way to include/exclude serial debug messages...
diff --git a/config.h b/config.h
index 968644e..f981b41 100644
--- a/config.h
+++ b/config.h
@@ -19,8 +19,8 @@
 
 #define OTA_HANDLER          // uncomment to enable OTA programming
 
-#define SSID     "ssid"      // SSID to join (or broadcast)
-#define PASSWD   "password"  // wiFi password
+#define SSID     "ssid_esp_uart_bridge"      // SSID to join (or broadcast)
+#define PASSWD   "password_esp_uart_bridgeAAAA"  // wiFi password
 #define HOSTNAME "esp32"     // hostname for STA mode mDNS
 
 #define BUFFERSIZE 1024
@@ -31,10 +31,10 @@
 #define VERSION "2.0-ESP8266"
 #endif
 
-#define MODE_STA               // MODE_STA or MODE_AP
+#define MODE_AP               // MODE_STA or MODE_AP
 #define PROTOCOL_TCP           // uncomment to enable TCP server
 #define MAX_NMEA_CLIENTS 4     // max TCP clients
-#define PROTOCOL_UDP           // uncomment to enable UDP broadcast (ESP32 only)
+//#define PROTOCOL_UDP           // uncomment to enable UDP broadcast (ESP32 only)
 //#define BLUETOOTH 0          // uncomment to create a bluetooth serial bridge on the indicated serial port (ESP32 only)
 //#define BATTERY_SAVER        // uncomment to reduce wifi power
 

From fc1a8559848eadcc8b532518057acddaa88958a8 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 20:08:26 +0900
Subject: [PATCH 02/12] add speed test python code

add speed test python code
---
 speed_test_script/test1_receive_random.py | 18 ++++++++++++++++++
 speed_test_script/test1_send_random.py    |  9 +++++++++
 2 files changed, 27 insertions(+)
 create mode 100644 speed_test_script/test1_receive_random.py
 create mode 100644 speed_test_script/test1_send_random.py

diff --git a/speed_test_script/test1_receive_random.py b/speed_test_script/test1_receive_random.py
new file mode 100644
index 0000000..20a5b04
--- /dev/null
+++ b/speed_test_script/test1_receive_random.py
@@ -0,0 +1,18 @@
+import serial, time
+
+ser = serial.Serial("COM18", 115200)
+# ser = serial.Serial("COM17", 115200)
+
+count = 0
+start = time.time()
+
+while True:
+    data = ser.read(1024)
+    count += len(data)
+    elapsed = time.time() - start
+    if elapsed >= 1.0:
+        #print(f"{count/elapsed/1024:.2f} KB/s")
+        print(f"{count*8/elapsed:.2f} bps")
+        count = 0
+        start = time.time()
+
diff --git a/speed_test_script/test1_send_random.py b/speed_test_script/test1_send_random.py
new file mode 100644
index 0000000..34db538
--- /dev/null
+++ b/speed_test_script/test1_send_random.py
@@ -0,0 +1,9 @@
+import serial, os
+
+# COMポートを指定（例: COM3）
+ser = serial.Serial("COM17", 115200)
+# ser = serial.Serial("COM18", 115200)
+
+while True:
+    ser.write(os.urandom(1024))
+

From e51453a530b94978db1db3b551a253b3b182bd16 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 20:16:13 +0900
Subject: [PATCH 03/12] add result of speed test, Client -> Host, communication
 speed has limit?

add result of speed test, Client -> Host, communication speed has limit?

Client -> Host, communication speed has limitation? 80000 bps?

0. same condition
1. TCP only without UDP waiting -> same speed
2. buffer size 1024 -> 2048, 80000 -> 77000 bps downed
---
 .../251007_speed_test_result-0.md             | 39 +++++++++++++++++++
 1 file changed, 39 insertions(+)
 create mode 100644 speed_test_script/251007_speed_test_result-0.md

diff --git a/speed_test_script/251007_speed_test_result-0.md b/speed_test_script/251007_speed_test_result-0.md
new file mode 100644
index 0000000..5b3a748
--- /dev/null
+++ b/speed_test_script/251007_speed_test_result-0.md
@@ -0,0 +1,39 @@
+# 251007_speed_test_result-0.md
+- Host -> Client: around 115200 bps, OK
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+9437.34 bps
+10642.07 bps
+6163.63 bps
+14873.13 bps
+11102.08 bps
+11005.70 bps
+5552.57 bps
+10833.07 bps
+11031.34 bps
+5211.61 bps
+5783.82 bps
+16435.98 bps
+10812.21 bps
+9828.91 bps
+12238.48 bps
+5398.71 bps
+11187.61 bps
+```
+- Client -> Host: around 80000 bps, it is strange
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+76537.87 bps
+80721.85 bps
+80845.42 bps
+80787.46 bps
+81025.16 bps
+80693.60 bps
+80843.86 bps
+80668.67 bps
+80694.41 bps
+80951.30 bps
+80942.55 bps
+80923.27 bps
+80717.47 bps
+```

From 19dbf8349a421d774aa1f5cca4a2bfe5f5ac1df7 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 21:18:52 +0900
Subject: [PATCH 04/12] checking fastest speed......

checking fastest speed......
---
 ESP-Serial-Bridge.ino                         | 17 ++++---
 config.h                                      |  5 ++-
 .../251007_speed_test_result-0.md             | 45 ++++++++++++++++++-
 speed_test_script/test1_receive_random.py     | 14 ++++--
 speed_test_script/test1_send_random.py        |  4 +-
 5 files changed, 68 insertions(+), 17 deletions(-)

diff --git a/ESP-Serial-Bridge.ino b/ESP-Serial-Bridge.ino
index 20f8814..0291310 100644
--- a/ESP-Serial-Bridge.ino
+++ b/ESP-Serial-Bridge.ino
@@ -56,7 +56,8 @@ BluetoothSerial SerialBT;
 
 HardwareSerial Serial_one(1);
 HardwareSerial Serial_two(2);
-HardwareSerial* COM[NUM_COM] = {&Serial, &Serial_one, &Serial_two};
+//HardwareSerial* COM[NUM_COM] = {&Serial, &Serial_one, &Serial_two};
+HardwareSerial* COM[NUM_COM] = {&Serial};
 #elif defined(ESP8266)
 SoftwareSerial Serial_zero(SERIAL0_RXPIN, SERIAL0_TXPIN);
 SoftwareSerial Serial_one(SERIAL1_RXPIN, SERIAL1_TXPIN);
@@ -66,11 +67,12 @@ SoftwareSerial* COM[NUM_COM] = {&Serial_zero, &Serial_one};
 #ifdef PROTOCOL_TCP
 #include <WiFiClient.h>
 WiFiServer server_0(SERIAL0_TCP_PORT);
-WiFiServer server_1(SERIAL1_TCP_PORT);
+//WiFiServer server_1(SERIAL1_TCP_PORT);
 
 #ifdef ESP32
-WiFiServer server_2(SERIAL2_TCP_PORT);
-WiFiServer* server[NUM_COM] = {&server_0, &server_1, &server_2};
+//WiFiServer server_2(SERIAL2_TCP_PORT);
+//WiFiServer* server[NUM_COM] = {&server_0, &server_1, &server_2};
+WiFiServer* server[NUM_COM] = {&server_0};
 #elif defined(ESP8266)
 WiFiServer* server[NUM_COM] = {&server_0, &server_1};
 #endif
@@ -81,7 +83,8 @@ uint8_t buf1[NUM_COM][BUFFERSIZE];
 uint8_t buf2[NUM_COM][BUFFERSIZE];
 
 #ifdef ESP32
-uint16_t i1[NUM_COM] = {0, 0, 0};
+//uint16_t i1[NUM_COM] = {0, 0, 0};
+uint16_t i1[NUM_COM] = {0};
 #elif defined(ESP8266)
 uint16_t i1[NUM_COM] = {0, 0};
 #endif
@@ -119,8 +122,8 @@ void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
 
 #ifdef ESP32
         COM[0]->begin(UART_BAUD0, SERIAL_PARAM0, SERIAL0_RXPIN, SERIAL0_TXPIN);
-        COM[1]->begin(UART_BAUD1, SERIAL_PARAM1, SERIAL1_RXPIN, SERIAL1_TXPIN);
-        COM[2]->begin(UART_BAUD2, SERIAL_PARAM2, SERIAL2_RXPIN, SERIAL2_TXPIN);
+        //COM[1]->begin(UART_BAUD1, SERIAL_PARAM1, SERIAL1_RXPIN, SERIAL1_TXPIN);
+        //COM[2]->begin(UART_BAUD2, SERIAL_PARAM2, SERIAL2_RXPIN, SERIAL2_TXPIN);
 #elif defined(ESP8266)
     COM[0]->begin(UART_BAUD0);
     COM[1]->begin(UART_BAUD1);
diff --git a/config.h b/config.h
index f981b41..8af09da 100644
--- a/config.h
+++ b/config.h
@@ -33,7 +33,7 @@
 
 #define MODE_AP               // MODE_STA or MODE_AP
 #define PROTOCOL_TCP           // uncomment to enable TCP server
-#define MAX_NMEA_CLIENTS 4     // max TCP clients
+#define MAX_NMEA_CLIENTS 1     // max TCP clients
 //#define PROTOCOL_UDP           // uncomment to enable UDP broadcast (ESP32 only)
 //#define BLUETOOTH 0          // uncomment to create a bluetooth serial bridge on the indicated serial port (ESP32 only)
 //#define BATTERY_SAVER        // uncomment to reduce wifi power
@@ -42,7 +42,8 @@
 #define NETMASK   IPAddress(255, 255, 255, 0)  // netmask for MODE_AP
 
 #ifdef ESP32
-#define NUM_COM   3    // 3 available on ESP32
+//#define NUM_COM   3    // 3 available on ESP32
+#define NUM_COM   1    // 3 available on ESP32
 #elif defined(ESP8266)
 #define NUM_COM   2    // we only use 2 on ESP8266
 #endif
diff --git a/speed_test_script/251007_speed_test_result-0.md b/speed_test_script/251007_speed_test_result-0.md
index 5b3a748..eb8f658 100644
--- a/speed_test_script/251007_speed_test_result-0.md
+++ b/speed_test_script/251007_speed_test_result-0.md
@@ -1,5 +1,11 @@
 # 251007_speed_test_result-0.md
-- Host -> Client: around 115200 bps, OK
+
+## test1
+- Host -> Client: around 11000 bps, 1/10
+- Client -> Host: around 80000 bps
+
+### test1 detail
+- Host -> Client: around 11000 bps, 1/10
 ```
 PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
 9437.34 bps
@@ -20,7 +26,7 @@ PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\t
 5398.71 bps
 11187.61 bps
 ```
-- Client -> Host: around 80000 bps, it is strange
+- Client -> Host: around 80000 bps
 ```
 PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
 76537.87 bps
@@ -37,3 +43,38 @@ PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\t
 80923.27 bps
 80717.47 bps
 ```
+
+## test2
+- Host -> Client, around 11000 bps, 1/10
+- Client -> Host, around 115200 bps, Ok
+
+### test2, detail
+- Host -> Client, around 11000 bps, 1/10
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+8613.45 bps
+7017.59 bps
+13569.80 bps
+6700.04 bps
+13826.51 bps
+14297.73 bps
+13348.43 bps
+13311.04 bps
+13815.43 bps
+6572.14 bps
+```
+- Client -> Host, around 115200 bps, Ok
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+2490.32 bps
+103051.81 bps
+101330.02 bps
+101190.01 bps
+101395.86 bps
+101285.53 bps
+101177.61 bps
+101078.65 bps
+101285.08 bps
+100570.91 bps
+100694.02 bps
+```
diff --git a/speed_test_script/test1_receive_random.py b/speed_test_script/test1_receive_random.py
index 20a5b04..d721f11 100644
--- a/speed_test_script/test1_receive_random.py
+++ b/speed_test_script/test1_receive_random.py
@@ -1,7 +1,7 @@
 import serial, time
 
-ser = serial.Serial("COM18", 115200)
-# ser = serial.Serial("COM17", 115200)
+# ser = serial.Serial("COM18", 115200)
+ser = serial.Serial("COM17", 115200)
 
 count = 0
 start = time.time()
@@ -11,8 +11,14 @@
     count += len(data)
     elapsed = time.time() - start
     if elapsed >= 1.0:
-        #print(f"{count/elapsed/1024:.2f} KB/s")
-        print(f"{count*8/elapsed:.2f} bps")
+        # kbps = (count / elapsed) / 1024.0   # KB/s
+        byte_per_sec = (count / elapsed)
+        kbps = byte_per_sec/ 1024.0   # KB/s
+        data_bps = byte_per_sec * 8          # データ部のみ（8bit換算）
+        total_bps = byte_per_sec * 10        # UART全体（8N1の場合）
+        # print(f"{kbps:.2f} KB/s")
+        # print(f"{data_bps:.2f} bps")
+        print(f"{total_bps:.2f} bps")
         count = 0
         start = time.time()
 
diff --git a/speed_test_script/test1_send_random.py b/speed_test_script/test1_send_random.py
index 34db538..4434774 100644
--- a/speed_test_script/test1_send_random.py
+++ b/speed_test_script/test1_send_random.py
@@ -1,8 +1,8 @@
 import serial, os
 
 # COMポートを指定（例: COM3）
-ser = serial.Serial("COM17", 115200)
-# ser = serial.Serial("COM18", 115200)
+# ser = serial.Serial("COM17", 115200)
+ser = serial.Serial("COM18", 115200)
 
 while True:
     ser.write(os.urandom(1024))

From 2ce3d521f093ba461dc632a6b5882299b41e8dcd Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 21:30:57 +0900
Subject: [PATCH 05/12] =?UTF-8?q?config.h=E3=82=92=E5=A4=89=E3=81=88?=
 =?UTF-8?q?=E3=81=A6=E3=81=BF=E3=81=9F=E3=82=8A=E3=81=97=E3=81=9F=E3=81=8C?=
 =?UTF-8?q?=E5=A4=89=E3=82=8F=E3=82=89=E3=81=AA=E3=81=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

config.hを変えてみたりしたが変わらない
- Host -> Client, around 13000 bps, 1/10
- Client -> Host, around 115200 bps
---
 ESP-Serial-Bridge.ino                         | 20 +++++------
 config.h                                      |  4 +--
 .../251007_speed_test_result-0.md             | 34 +++++++++++++++++++
 speed_test_script/test1_receive_random.py     |  4 +--
 speed_test_script/test1_send_random.py        |  4 +--
 5 files changed, 50 insertions(+), 16 deletions(-)

diff --git a/ESP-Serial-Bridge.ino b/ESP-Serial-Bridge.ino
index 0291310..b80672c 100644
--- a/ESP-Serial-Bridge.ino
+++ b/ESP-Serial-Bridge.ino
@@ -56,8 +56,8 @@ BluetoothSerial SerialBT;
 
 HardwareSerial Serial_one(1);
 HardwareSerial Serial_two(2);
-//HardwareSerial* COM[NUM_COM] = {&Serial, &Serial_one, &Serial_two};
-HardwareSerial* COM[NUM_COM] = {&Serial};
+HardwareSerial* COM[NUM_COM] = {&Serial, &Serial_one, &Serial_two};
+//HardwareSerial* COM[NUM_COM] = {&Serial};
 #elif defined(ESP8266)
 SoftwareSerial Serial_zero(SERIAL0_RXPIN, SERIAL0_TXPIN);
 SoftwareSerial Serial_one(SERIAL1_RXPIN, SERIAL1_TXPIN);
@@ -67,12 +67,12 @@ SoftwareSerial* COM[NUM_COM] = {&Serial_zero, &Serial_one};
 #ifdef PROTOCOL_TCP
 #include <WiFiClient.h>
 WiFiServer server_0(SERIAL0_TCP_PORT);
-//WiFiServer server_1(SERIAL1_TCP_PORT);
+WiFiServer server_1(SERIAL1_TCP_PORT);
 
 #ifdef ESP32
-//WiFiServer server_2(SERIAL2_TCP_PORT);
-//WiFiServer* server[NUM_COM] = {&server_0, &server_1, &server_2};
-WiFiServer* server[NUM_COM] = {&server_0};
+WiFiServer server_2(SERIAL2_TCP_PORT);
+WiFiServer* server[NUM_COM] = {&server_0, &server_1, &server_2};
+//WiFiServer* server[NUM_COM] = {&server_0};
 #elif defined(ESP8266)
 WiFiServer* server[NUM_COM] = {&server_0, &server_1};
 #endif
@@ -83,8 +83,8 @@ uint8_t buf1[NUM_COM][BUFFERSIZE];
 uint8_t buf2[NUM_COM][BUFFERSIZE];
 
 #ifdef ESP32
-//uint16_t i1[NUM_COM] = {0, 0, 0};
-uint16_t i1[NUM_COM] = {0};
+uint16_t i1[NUM_COM] = {0, 0, 0};
+//uint16_t i1[NUM_COM] = {0};
 #elif defined(ESP8266)
 uint16_t i1[NUM_COM] = {0, 0};
 #endif
@@ -122,8 +122,8 @@ void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
 
 #ifdef ESP32
         COM[0]->begin(UART_BAUD0, SERIAL_PARAM0, SERIAL0_RXPIN, SERIAL0_TXPIN);
-        //COM[1]->begin(UART_BAUD1, SERIAL_PARAM1, SERIAL1_RXPIN, SERIAL1_TXPIN);
-        //COM[2]->begin(UART_BAUD2, SERIAL_PARAM2, SERIAL2_RXPIN, SERIAL2_TXPIN);
+        COM[1]->begin(UART_BAUD1, SERIAL_PARAM1, SERIAL1_RXPIN, SERIAL1_TXPIN);
+        COM[2]->begin(UART_BAUD2, SERIAL_PARAM2, SERIAL2_RXPIN, SERIAL2_TXPIN);
 #elif defined(ESP8266)
     COM[0]->begin(UART_BAUD0);
     COM[1]->begin(UART_BAUD1);
diff --git a/config.h b/config.h
index 8af09da..0be1919 100644
--- a/config.h
+++ b/config.h
@@ -42,8 +42,8 @@
 #define NETMASK   IPAddress(255, 255, 255, 0)  // netmask for MODE_AP
 
 #ifdef ESP32
-//#define NUM_COM   3    // 3 available on ESP32
-#define NUM_COM   1    // 3 available on ESP32
+#define NUM_COM   3    // 3 available on ESP32
+//#define NUM_COM   1    // 3 available on ESP32
 #elif defined(ESP8266)
 #define NUM_COM   2    // we only use 2 on ESP8266
 #endif
diff --git a/speed_test_script/251007_speed_test_result-0.md b/speed_test_script/251007_speed_test_result-0.md
index eb8f658..e673607 100644
--- a/speed_test_script/251007_speed_test_result-0.md
+++ b/speed_test_script/251007_speed_test_result-0.md
@@ -78,3 +78,37 @@ PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\t
 100570.91 bps
 100694.02 bps
 ```
+
+## test3
+- Host -> Client, around 115200 bps
+- Client -> Host, around 13000 bps, 1/10
+
+### test3, detail
+- Host -> Client, around 115200 bps
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+825.76 bps
+101699.98 bps
+101086.60 bps
+100784.28 bps
+101176.80 bps
+101184.19 bps
+101181.45 bps
+100977.22 bps
+101200.93 bps
+101220.15 bps
+```
+- Client -> Host, around 13000 bps, 1/10
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+8643.42 bps
+13705.61 bps
+7663.88 bps
+13088.96 bps
+12960.40 bps
+13315.06 bps
+14086.15 bps
+13497.89 bps
+14034.07 bps
+13409.55 bps
+```
diff --git a/speed_test_script/test1_receive_random.py b/speed_test_script/test1_receive_random.py
index d721f11..d7552bd 100644
--- a/speed_test_script/test1_receive_random.py
+++ b/speed_test_script/test1_receive_random.py
@@ -1,7 +1,7 @@
 import serial, time
 
-# ser = serial.Serial("COM18", 115200)
-ser = serial.Serial("COM17", 115200)
+ser = serial.Serial("COM18", 115200)
+# ser = serial.Serial("COM17", 115200)
 
 count = 0
 start = time.time()
diff --git a/speed_test_script/test1_send_random.py b/speed_test_script/test1_send_random.py
index 4434774..34db538 100644
--- a/speed_test_script/test1_send_random.py
+++ b/speed_test_script/test1_send_random.py
@@ -1,8 +1,8 @@
 import serial, os
 
 # COMポートを指定（例: COM3）
-# ser = serial.Serial("COM17", 115200)
-ser = serial.Serial("COM18", 115200)
+ser = serial.Serial("COM17", 115200)
+# ser = serial.Serial("COM18", 115200)
 
 while True:
     ser.write(os.urandom(1024))

From 12bf00b00c7ec16923dd7f90667783aa1d19194f Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Tue, 7 Oct 2025 21:33:11 +0900
Subject: [PATCH 06/12] =?UTF-8?q?config.h=E3=82=92=E5=A4=89=E3=81=88?=
 =?UTF-8?q?=E3=81=A6=E3=81=BF=E3=81=9F=E3=82=8A=E3=81=97=E3=81=9F=E3=81=8C?=
 =?UTF-8?q?=E5=A4=89=E3=82=8F=E3=82=89=E3=81=AA=E3=81=84?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

config.hを変えてみたりしたが変わらない
- Host -> Client, around 13000 bps, 1/10
- Client -> Host, around 115200 bps
---
 .../251007_speed_test_result-0.md             | 36 ++++++++++---------
 1 file changed, 19 insertions(+), 17 deletions(-)

diff --git a/speed_test_script/251007_speed_test_result-0.md b/speed_test_script/251007_speed_test_result-0.md
index e673607..08cf9c9 100644
--- a/speed_test_script/251007_speed_test_result-0.md
+++ b/speed_test_script/251007_speed_test_result-0.md
@@ -80,25 +80,11 @@ PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\t
 ```
 
 ## test3
-- Host -> Client, around 115200 bps
-- Client -> Host, around 13000 bps, 1/10
+- Host -> Client, around 13000 bps, 1/10
+- Client -> Host, around 115200 bps
 
 ### test3, detail
-- Host -> Client, around 115200 bps
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-825.76 bps
-101699.98 bps
-101086.60 bps
-100784.28 bps
-101176.80 bps
-101184.19 bps
-101181.45 bps
-100977.22 bps
-101200.93 bps
-101220.15 bps
-```
-- Client -> Host, around 13000 bps, 1/10
+- Host -> Client, around 13000 bps, 1/10
 ```
 PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
 8643.42 bps
@@ -112,3 +98,19 @@ PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\t
 14034.07 bps
 13409.55 bps
 ```
+
+- Client -> Host, around 115200 bps
+```
+PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
+825.76 bps
+101699.98 bps
+101086.60 bps
+100784.28 bps
+101176.80 bps
+101184.19 bps
+101181.45 bps
+100977.22 bps
+101200.93 bps
+101220.15 bps
+```
+

From 18c63b2bb91739cab935dc2135923eac188114b0 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 8 Oct 2025 15:49:49 +0900
Subject: [PATCH 07/12] test adding watch dog timer, wdt

test adding watch dog timer, wdt
---
 .../251008_error_message_for_adding_wdt.md    | 52 +++++++++++++++++++
 .../ESP32-Serial-WiFi-Client.ino              | 17 ++++++
 2 files changed, 69 insertions(+)
 create mode 100644 ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md

diff --git a/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md b/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md
new file mode 100644
index 0000000..82c70bc
--- /dev/null
+++ b/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md
@@ -0,0 +1,52 @@
+# 251008_error_message_for_adding_wdt.md
+
+## cycle 1
+```
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void setup()':
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:80:23: error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'
+   80 |     timer = timerBegin(0, 80, true);                  //timer 0, div 80
+      |             ~~~~~~~~~~^~~~~~~~~~~~~
+In file included from C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal.h:98,
+                 from C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/Arduino.h:44,
+                 from C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:12:
+C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal-timer.h:35:13: note: declared here
+   35 | hw_timer_t *timerBegin(uint32_t frequency);
+      |             ^~~~~~~~~~
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:81:25: error: too many arguments to function 'void timerAttachInterrupt(hw_timer_t*, void (*)())'
+   81 |     timerAttachInterrupt(timer, &resetModule, true);  //attach callback
+      |     ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
+C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal-timer.h:50:6: note: declared here
+   50 | void timerAttachInterrupt(hw_timer_t *timer, void (*userFunc)(void));
+      |      ^~~~~~~~~~~~~~~~~~~~
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:82:5: error: 'timerAlarmWrite' was not declared in this scope; did you mean 'timerWrite'?
+   82 |     timerAlarmWrite(timer, TIMEOUT * 1000, false);    //set time in us
+      |     ^~~~~~~~~~~~~~~
+      |     timerWrite
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:83:5: error: 'timerAlarmEnable' was not declared in this scope; did you mean 'timerAlarm'?
+   83 |     timerAlarmEnable(timer);                          //enable interrupt
+      |     ^~~~~~~~~~~~~~~~
+      |     timerAlarm
+exit status 1
+
+Compilation error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'
+```
+
+## cycle 2
+```
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:34:1: error: expected ',' or ';' before 'hw_timer_t'
+   34 | hw_timer_t *timer = NULL;
+      | ^~~~~~~~~~
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void setup()':
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:80:5: error: 'timer' was not declared in this scope; did you mean 'time'?
+   80 |     timer = timerBegin(1000000);                       //timer 1MHz
+      |     ^~~~~
+      |     time
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void loop()':
+C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:150:16: error: 'timer' was not declared in this scope; did you mean 'time'?
+  150 |     timerWrite(timer, 0); //reset timer (feed watchdog)
+      |                ^~~~~
+      |                time
+exit status 1
+
+Compilation error: expected ',' or ';' before 'hw_timer_t'
+```
\ No newline at end of file
diff --git a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
index ceee4f6..ce3d5e4 100644
--- a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
+++ b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
@@ -13,6 +13,7 @@
 #include <ESPmDNS.h>
 #include <WiFi.h>
 #include <esp_wifi.h>
+#include "esp_system.h"
 
 #include "client_config.h"
 
@@ -29,6 +30,14 @@
 uint8_t buf[BUFFERSIZE];
 uint16_t num = 0;
 
+const int wdtTimeout = 30000;  // reboot after 30 seconds of no clients
+hw_timer_t *timer = NULL;
+
+void ARDUINO_ISR_ATTR resetModule() {
+  debug.println("Rebooting...");
+  esp_restart();
+}
+
 #ifdef PROTOCOL_TCP
 WiFiClient client;
 void connect_to_host() {
@@ -68,6 +77,11 @@ void setup() {
     debug.print("\n\nWiFi serial bridge client ");
     debug.println(VERSION);
 
+    timer = timerBegin(1000000);                       //timer 1MHz
+    timerAttachInterrupt(timer, &resetModule);         //attach callback
+    timerAlarm(timer, wdtTimeout * 1000, false, 0);    //set time in us
+    debug.println("Watch dog timer Setup done");
+
     debug.println("Open ESP Station Mode");
     WiFi.mode(WIFI_STA);
     WiFi.onEvent(WiFiStationDisconnected, ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
@@ -79,6 +93,7 @@ void setup() {
         delay(500);
         debug.print(".");
     }
+    timerWrite(timer, 0); //reset timer (feed watchdog)
     debug.println("connected");
     debug.print("IP address: ");
     debug.println(WiFi.localIP());
@@ -131,6 +146,8 @@ void loop() {
 #ifdef OTA_HANDLER
     ArduinoOTA.handle();
 #endif
+    
+    timerWrite(timer, 0); //reset timer (feed watchdog)
 
 #ifdef PROTOCOL_TCP
     if (!client.connected()) connect_to_host();

From 6f866e229968b1be3c4e6cea1c3f325df7647af0 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 17 Dec 2025 19:07:40 +0900
Subject: [PATCH 08/12] =?UTF-8?q?Host=E5=81=B4=E3=81=8C=E8=90=BD=E3=81=A1?=
 =?UTF-8?q?=E3=81=9F=E6=99=82=E3=81=AB=E7=84=A1=E9=99=90=E3=83=AB=E3=83=BC?=
 =?UTF-8?q?=E3=83=97=E3=81=8B=E3=81=A4Watch=20dog=20timer=E3=81=8C?=
 =?UTF-8?q?=E5=8A=B9=E3=81=8B=E3=81=AA=E3=81=8B=E3=81=A3=E3=81=9F=E3=82=A8?=
 =?UTF-8?q?=E3=83=A9=E3=83=BC=E3=82=92=E4=BF=AE=E6=AD=A3?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Host側が落ちた時に無限ループかつWatch dog timerが効かなかったエラーを修正
1. Client側が落ちた場合（ClientのReset）→Host側からの入力で回復
2. Host側が落ちてすぐ回復した場合（HostのReset）→OK
3. Host側が落ちて回復しない場合（HostのOFF）→30sごとにWatch dog TimerでClientをReset
の3ケースに対応した
---
 .../ESP32-Serial-WiFi-Client.ino              | 229 ++++++++++--------
 1 file changed, 127 insertions(+), 102 deletions(-)

diff --git a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
index ce3d5e4..5e2ffa4 100644
--- a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
+++ b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
@@ -30,7 +30,7 @@
 uint8_t buf[BUFFERSIZE];
 uint16_t num = 0;
 
-const int wdtTimeout = 30000;  // reboot after 30 seconds of no clients
+const int wdtTimeout = 30000;  // reboot after 30 seconds of no host
 hw_timer_t *timer = NULL;
 
 void ARDUINO_ISR_ATTR resetModule() {
@@ -41,13 +41,21 @@ void ARDUINO_ISR_ATTR resetModule() {
 #ifdef PROTOCOL_TCP
 WiFiClient client;
 void connect_to_host() {
-    debug.printf("Connecting to %s:%d...", HOST_IP.toString(), HOST_PORT);
-    while (!client.connect(HOST_IP, HOST_PORT)) {
-        delay(500);
-        debug.print('.');
-    }
-    debug.println("connected\n");
-    delay(1000);
+  debug.printf("Connecting to %s:%d...", HOST_IP.toString(), HOST_PORT);
+
+  //timer = timerBegin(1000000);                     //timer 1MHz
+  //timerAttachInterrupt(timer, &resetModule);       //attach callback
+  //timerAlarm(timer, wdtTimeout * 1000, false, 0);  //set time in us
+  //debug.println("Watch dog timer Setup done");
+
+  debug.println("while, connect_to_host");
+  while (!client.connect(HOST_IP, HOST_PORT)) {
+    delay(500);
+    debug.print('.');
+  }
+  //timerWrite(timer, 0);  //reset timer (feed watchdog)
+  debug.println("connected, connect_to_host\n");
+  delay(1000);
 }
 #endif
 
@@ -56,121 +64,138 @@ AsyncUDP udp;
 #endif
 
 void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
-    debug.print("WiFi disconnected: ");
-    debug.println(info.wifi_sta_disconnected.reason);
-    debug.println("Trying to reconnect..");
-    WiFi.begin(SSID, PASSWD);
-    while (WiFi.status() != WL_CONNECTED) {
-        delay(500);
-        debug.print(".");
+  debug.print("WiFi disconnected: ");
+  debug.println(info.wifi_sta_disconnected.reason);
+  debug.println("Trying to reconnect..");
+  WiFi.begin(SSID, PASSWD);
+
+  //timer = timerBegin(1000000);                     //timer 1MHz
+  //timerAttachInterrupt(timer, &resetModule);       //attach callback
+  //timerAlarm(timer, wdtTimeout * 1000, false, 0);  //set time in us
+  //debug.println("Watch dog timer Setup done");
+
+  debug.println("while, WiFiStationDisconnected");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    debug.print(".");
+    if(client.connect(HOST_IP, HOST_PORT)) {
+        break;
     }
-    debug.println("connected");
-    debug.print("IP address: ");
-    debug.println(WiFi.localIP());
+  }
+  //timerWrite(timer, 0);  //reset timer (feed watchdog)
+  debug.println("connected, WiFiStationDisconnected");
+  debug.print("IP address: ");
+  debug.println(WiFi.localIP());
 }
 
 void setup() {
-    delay(500);
+  delay(500);
 
-    Serial.begin(CLIENT_BAUD, CLIENT_PARAM, CLIENT_RXPIN, CLIENT_TXPIN);
-
-    debug.print("\n\nWiFi serial bridge client ");
-    debug.println(VERSION);
-
-    timer = timerBegin(1000000);                       //timer 1MHz
-    timerAttachInterrupt(timer, &resetModule);         //attach callback
-    timerAlarm(timer, wdtTimeout * 1000, false, 0);    //set time in us
-    debug.println("Watch dog timer Setup done");
-
-    debug.println("Open ESP Station Mode");
-    WiFi.mode(WIFI_STA);
-    WiFi.onEvent(WiFiStationDisconnected, ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
-    WiFi.begin(SSID, PASSWD);
-    debug.print("Connecting to: ");
-    debug.print(SSID);
-    debug.print("..");
-    while (WiFi.status() != WL_CONNECTED) {
-        delay(500);
-        debug.print(".");
-    }
-    timerWrite(timer, 0); //reset timer (feed watchdog)
-    debug.println("connected");
-    debug.print("IP address: ");
-    debug.println(WiFi.localIP());
+  Serial.begin(CLIENT_BAUD, CLIENT_PARAM, CLIENT_RXPIN, CLIENT_TXPIN);
 
-#ifdef OTA_HANDLER
-    ArduinoOTA.onStart([]() {
-        String type;
-        if (ArduinoOTA.getCommand() == U_FLASH)
-            type = "sketch";
-        else  // U_SPIFFS
-            type = "filesystem";
-
-        // NOTE: if updating SPIFFS this would be the place to unmount SPIFFS
-        // using SPIFFS.end()
-        Serial.println("Start updating " + type);
-    });
-    ArduinoOTA.onEnd([]() { Serial.println("\nEnd"); });
-    ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
-        Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
-    });
-    ArduinoOTA.onError([](ota_error_t error) {
-        Serial.printf("Error[%u]: ", error);
-        if (error == OTA_AUTH_ERROR)
-            Serial.println("Auth Failed");
-        else if (error == OTA_BEGIN_ERROR)
-            Serial.println("Begin Failed");
-        else if (error == OTA_CONNECT_ERROR)
-            Serial.println("Connect Failed");
-        else if (error == OTA_RECEIVE_ERROR)
-            Serial.println("Receive Failed");
-        else if (error == OTA_END_ERROR)
-            Serial.println("End Failed");
-    });
+  debug.print("\n\nWiFi serial bridge client ");
+  debug.println(VERSION);
 
-    ArduinoOTA.begin();
+  debug.println("Open ESP Station Mode");
+  WiFi.mode(WIFI_STA);
+  WiFi.onEvent(WiFiStationDisconnected, ARDUINO_EVENT_WIFI_STA_DISCONNECTED);
+  WiFi.begin(SSID, PASSWD);
+  debug.print("Connecting to: ");
+  debug.print(SSID);
+  debug.print("..");
+
+  timer = timerBegin(1000000);                     //timer 1MHz
+  timerAttachInterrupt(timer, &resetModule);       //attach callback
+  timerAlarm(timer, wdtTimeout * 1000, false, 0);  //set time in us
+  debug.println("Watch dog timer Setup done");
+
+  debug.println("while, setup");
+  while (WiFi.status() != WL_CONNECTED) {
+    delay(500);
+    debug.print(".");
+  }
+  timerWrite(timer, 0);  //reset timer (feed watchdog)
+  debug.println("connected, setup");
+  debug.print("IP address: ");
+  debug.println(WiFi.localIP());
+
+#ifdef OTA_HANDLER
+  ArduinoOTA.onStart([]() {
+    String type;
+    if (ArduinoOTA.getCommand() == U_FLASH)
+      type = "sketch";
+    else  // U_SPIFFS
+      type = "filesystem";
+
+    // NOTE: if updating SPIFFS this would be the place to unmount SPIFFS
+    // using SPIFFS.end()
+    Serial.println("Start updating " + type);
+  });
+  ArduinoOTA.onEnd([]() {
+    Serial.println("\nEnd");
+  });
+  ArduinoOTA.onProgress([](unsigned int progress, unsigned int total) {
+    Serial.printf("Progress: %u%%\r", (progress / (total / 100)));
+  });
+  ArduinoOTA.onError([](ota_error_t error) {
+    Serial.printf("Error[%u]: ", error);
+    if (error == OTA_AUTH_ERROR)
+      Serial.println("Auth Failed");
+    else if (error == OTA_BEGIN_ERROR)
+      Serial.println("Begin Failed");
+    else if (error == OTA_CONNECT_ERROR)
+      Serial.println("Connect Failed");
+    else if (error == OTA_RECEIVE_ERROR)
+      Serial.println("Receive Failed");
+    else if (error == OTA_END_ERROR)
+      Serial.println("End Failed");
+  });
+
+  ArduinoOTA.begin();
 #endif
 
 #ifdef PROTOCOL_UDP
-    if (udp.listen(HOST_PORT)) {
-        debug.printf("Listening on UDP port %d\n", HOST_PORT);
-        udp.onPacket([](AsyncUDPPacket packet) {
-            if (packet.localPort() == HOST_PORT)
-                Serial.write(packet.data(), packet.length());
-        });
-    }
+  if (udp.listen(HOST_PORT)) {
+    debug.printf("Listening on UDP port %d\n", HOST_PORT);
+    udp.onPacket([](AsyncUDPPacket packet) {
+      if (packet.localPort() == HOST_PORT)
+        Serial.write(packet.data(), packet.length());
+    });
+  }
 #endif
 }
 
 void loop() {
 #ifdef OTA_HANDLER
-    ArduinoOTA.handle();
+  ArduinoOTA.handle();
 #endif
-    
-    timerWrite(timer, 0); //reset timer (feed watchdog)
 
-#ifdef PROTOCOL_TCP
-    if (!client.connected()) connect_to_host();
+  timerWrite(timer, 0);  //reset timer (feed watchdog)
 
-    while (client.available()) {
-        buf[num] = client.read();
-        num++;
-        if (num == BUFFERSIZE - 1) break;
-    }
-    if (num > 0) Serial.write(buf, num);
-    num = 0;
+#ifdef PROTOCOL_TCP
+  if (!client.connected()) {
+    connect_to_host();
+  }
+
+  while (client.available()) {
+    buf[num] = client.read();
+    num++;
+    if (num == BUFFERSIZE - 1) break;
+  }
+  if (num > 0) Serial.write(buf, num);
+  num = 0;
 #endif
 
-    while (Serial.available()) {
-        buf[num] = Serial.read();
-        num++;
-        if (num == BUFFERSIZE - 1) break;
-    }
+  while (Serial.available()) {
+    buf[num] = Serial.read();
+    num++;
+    if (num == BUFFERSIZE - 1) break;
+  }
 #ifdef PROTOCOL_TCP
-    if (num > 0) client.write(buf, num);
+  if (num > 0) client.write(buf, num);
 #elif defined(PROTOCOL_UDP)
-    //udp.broadcastTo(buf, num, HOST_PORT + 1);
-    udp.broadcastTo(buf, num, HOST_PORT);
+  //udp.broadcastTo(buf, num, HOST_PORT + 1);
+  udp.broadcastTo(buf, num, HOST_PORT);
 #endif
-    num = 0;
+  num = 0;
 }

From 6ecf0973cb5ca50ff8208fe1b04f0f26723bad24 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 17 Dec 2025 19:09:01 +0900
Subject: [PATCH 09/12] delete commented line

delete commented line
---
 .../ESP32-Serial-WiFi-Client.ino                   | 14 --------------
 1 file changed, 14 deletions(-)

diff --git a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
index 5e2ffa4..f3abe14 100644
--- a/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
+++ b/ESP32-Serial-WiFi-Client/ESP32-Serial-WiFi-Client.ino
@@ -42,18 +42,11 @@ void ARDUINO_ISR_ATTR resetModule() {
 WiFiClient client;
 void connect_to_host() {
   debug.printf("Connecting to %s:%d...", HOST_IP.toString(), HOST_PORT);
-
-  //timer = timerBegin(1000000);                     //timer 1MHz
-  //timerAttachInterrupt(timer, &resetModule);       //attach callback
-  //timerAlarm(timer, wdtTimeout * 1000, false, 0);  //set time in us
-  //debug.println("Watch dog timer Setup done");
-
   debug.println("while, connect_to_host");
   while (!client.connect(HOST_IP, HOST_PORT)) {
     delay(500);
     debug.print('.');
   }
-  //timerWrite(timer, 0);  //reset timer (feed watchdog)
   debug.println("connected, connect_to_host\n");
   delay(1000);
 }
@@ -68,12 +61,6 @@ void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
   debug.println(info.wifi_sta_disconnected.reason);
   debug.println("Trying to reconnect..");
   WiFi.begin(SSID, PASSWD);
-
-  //timer = timerBegin(1000000);                     //timer 1MHz
-  //timerAttachInterrupt(timer, &resetModule);       //attach callback
-  //timerAlarm(timer, wdtTimeout * 1000, false, 0);  //set time in us
-  //debug.println("Watch dog timer Setup done");
-
   debug.println("while, WiFiStationDisconnected");
   while (WiFi.status() != WL_CONNECTED) {
     delay(500);
@@ -82,7 +69,6 @@ void WiFiStationDisconnected(WiFiEvent_t event, WiFiEventInfo_t info) {
         break;
     }
   }
-  //timerWrite(timer, 0);  //reset timer (feed watchdog)
   debug.println("connected, WiFiStationDisconnected");
   debug.print("IP address: ");
   debug.println(WiFi.localIP());

From ed6678f79bf8a6a4311bd5253a4d66870902517d Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 17 Dec 2025 19:15:13 +0900
Subject: [PATCH 10/12] delete development memo

delete development memo
---
 .../251008_error_message_for_adding_wdt.md    | 52 -------------------
 1 file changed, 52 deletions(-)
 delete mode 100644 ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md

diff --git a/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md b/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md
deleted file mode 100644
index 82c70bc..0000000
--- a/ESP32-Serial-WiFi-Client/251008_error_message_for_adding_wdt.md
+++ /dev/null
@@ -1,52 +0,0 @@
-# 251008_error_message_for_adding_wdt.md
-
-## cycle 1
-```
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void setup()':
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:80:23: error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'
-   80 |     timer = timerBegin(0, 80, true);                  //timer 0, div 80
-      |             ~~~~~~~~~~^~~~~~~~~~~~~
-In file included from C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal.h:98,
-                 from C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/Arduino.h:44,
-                 from C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:12:
-C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal-timer.h:35:13: note: declared here
-   35 | hw_timer_t *timerBegin(uint32_t frequency);
-      |             ^~~~~~~~~~
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:81:25: error: too many arguments to function 'void timerAttachInterrupt(hw_timer_t*, void (*)())'
-   81 |     timerAttachInterrupt(timer, &resetModule, true);  //attach callback
-      |     ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
-C:\Users\YoshihiroNakagawa\AppData\Local\Arduino15\packages\esp32\hardware\esp32\3.3.0\cores\esp32/esp32-hal-timer.h:50:6: note: declared here
-   50 | void timerAttachInterrupt(hw_timer_t *timer, void (*userFunc)(void));
-      |      ^~~~~~~~~~~~~~~~~~~~
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:82:5: error: 'timerAlarmWrite' was not declared in this scope; did you mean 'timerWrite'?
-   82 |     timerAlarmWrite(timer, TIMEOUT * 1000, false);    //set time in us
-      |     ^~~~~~~~~~~~~~~
-      |     timerWrite
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:83:5: error: 'timerAlarmEnable' was not declared in this scope; did you mean 'timerAlarm'?
-   83 |     timerAlarmEnable(timer);                          //enable interrupt
-      |     ^~~~~~~~~~~~~~~~
-      |     timerAlarm
-exit status 1
-
-Compilation error: too many arguments to function 'hw_timer_t* timerBegin(uint32_t)'
-```
-
-## cycle 2
-```
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:34:1: error: expected ',' or ';' before 'hw_timer_t'
-   34 | hw_timer_t *timer = NULL;
-      | ^~~~~~~~~~
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void setup()':
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:80:5: error: 'timer' was not declared in this scope; did you mean 'time'?
-   80 |     timer = timerBegin(1000000);                       //timer 1MHz
-      |     ^~~~~
-      |     time
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino: In function 'void loop()':
-C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\ESP32-Serial-WiFi-Client\ESP32-Serial-WiFi-Client.ino:150:16: error: 'timer' was not declared in this scope; did you mean 'time'?
-  150 |     timerWrite(timer, 0); //reset timer (feed watchdog)
-      |                ^~~~~
-      |                time
-exit status 1
-
-Compilation error: expected ',' or ';' before 'hw_timer_t'
-```
\ No newline at end of file

From 2fb6ec9fcaf21b37044f058755603b3a1951bbb8 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 17 Dec 2025 19:32:00 +0900
Subject: [PATCH 11/12] undo for pull request

undo for pull request
---
 ESP32-Serial-WiFi-Client/client_config.h      |   4 +-
 config.h                                      |   4 +-
 .../251007_speed_test_result-0.md             | 116 ------------------
 speed_test_script/test1_receive_random.py     |  24 ----
 speed_test_script/test1_send_random.py        |   9 --
 5 files changed, 4 insertions(+), 153 deletions(-)
 delete mode 100644 speed_test_script/251007_speed_test_result-0.md
 delete mode 100644 speed_test_script/test1_receive_random.py
 delete mode 100644 speed_test_script/test1_send_random.py

diff --git a/ESP32-Serial-WiFi-Client/client_config.h b/ESP32-Serial-WiFi-Client/client_config.h
index c61bc27..a277dc8 100644
--- a/ESP32-Serial-WiFi-Client/client_config.h
+++ b/ESP32-Serial-WiFi-Client/client_config.h
@@ -13,8 +13,8 @@
 
 #define OTA_HANDLER        // uncomment to enable OTA programming
 
-#define SSID   "ssid_esp_uart_bridge"      // SSID to join
-#define PASSWD "password_esp_uart_bridgeAAAA"  // wiFi password
+#define SSID   "ssid"      // SSID to join
+#define PASSWD "password"  // wiFi password
 
 #define BUFFERSIZE 1024
 
diff --git a/config.h b/config.h
index 0be1919..6a440e3 100644
--- a/config.h
+++ b/config.h
@@ -19,8 +19,8 @@
 
 #define OTA_HANDLER          // uncomment to enable OTA programming
 
-#define SSID     "ssid_esp_uart_bridge"      // SSID to join (or broadcast)
-#define PASSWD   "password_esp_uart_bridgeAAAA"  // wiFi password
+#define SSID     "ssid"      // SSID to join (or broadcast)
+#define PASSWD   "password"  // wiFi password
 #define HOSTNAME "esp32"     // hostname for STA mode mDNS
 
 #define BUFFERSIZE 1024
diff --git a/speed_test_script/251007_speed_test_result-0.md b/speed_test_script/251007_speed_test_result-0.md
deleted file mode 100644
index 08cf9c9..0000000
--- a/speed_test_script/251007_speed_test_result-0.md
+++ /dev/null
@@ -1,116 +0,0 @@
-# 251007_speed_test_result-0.md
-
-## test1
-- Host -> Client: around 11000 bps, 1/10
-- Client -> Host: around 80000 bps
-
-### test1 detail
-- Host -> Client: around 11000 bps, 1/10
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-9437.34 bps
-10642.07 bps
-6163.63 bps
-14873.13 bps
-11102.08 bps
-11005.70 bps
-5552.57 bps
-10833.07 bps
-11031.34 bps
-5211.61 bps
-5783.82 bps
-16435.98 bps
-10812.21 bps
-9828.91 bps
-12238.48 bps
-5398.71 bps
-11187.61 bps
-```
-- Client -> Host: around 80000 bps
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-76537.87 bps
-80721.85 bps
-80845.42 bps
-80787.46 bps
-81025.16 bps
-80693.60 bps
-80843.86 bps
-80668.67 bps
-80694.41 bps
-80951.30 bps
-80942.55 bps
-80923.27 bps
-80717.47 bps
-```
-
-## test2
-- Host -> Client, around 11000 bps, 1/10
-- Client -> Host, around 115200 bps, Ok
-
-### test2, detail
-- Host -> Client, around 11000 bps, 1/10
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-8613.45 bps
-7017.59 bps
-13569.80 bps
-6700.04 bps
-13826.51 bps
-14297.73 bps
-13348.43 bps
-13311.04 bps
-13815.43 bps
-6572.14 bps
-```
-- Client -> Host, around 115200 bps, Ok
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-2490.32 bps
-103051.81 bps
-101330.02 bps
-101190.01 bps
-101395.86 bps
-101285.53 bps
-101177.61 bps
-101078.65 bps
-101285.08 bps
-100570.91 bps
-100694.02 bps
-```
-
-## test3
-- Host -> Client, around 13000 bps, 1/10
-- Client -> Host, around 115200 bps
-
-### test3, detail
-- Host -> Client, around 13000 bps, 1/10
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-8643.42 bps
-13705.61 bps
-7663.88 bps
-13088.96 bps
-12960.40 bps
-13315.06 bps
-14086.15 bps
-13497.89 bps
-14034.07 bps
-13409.55 bps
-```
-
-- Client -> Host, around 115200 bps
-```
-PS C:\250602_Works\250602_GitLab\ESP-Serial-Bridge\speed_test_script> python .\test1_receive_random.py
-825.76 bps
-101699.98 bps
-101086.60 bps
-100784.28 bps
-101176.80 bps
-101184.19 bps
-101181.45 bps
-100977.22 bps
-101200.93 bps
-101220.15 bps
-```
-
diff --git a/speed_test_script/test1_receive_random.py b/speed_test_script/test1_receive_random.py
deleted file mode 100644
index d7552bd..0000000
--- a/speed_test_script/test1_receive_random.py
+++ /dev/null
@@ -1,24 +0,0 @@
-import serial, time
-
-ser = serial.Serial("COM18", 115200)
-# ser = serial.Serial("COM17", 115200)
-
-count = 0
-start = time.time()
-
-while True:
-    data = ser.read(1024)
-    count += len(data)
-    elapsed = time.time() - start
-    if elapsed >= 1.0:
-        # kbps = (count / elapsed) / 1024.0   # KB/s
-        byte_per_sec = (count / elapsed)
-        kbps = byte_per_sec/ 1024.0   # KB/s
-        data_bps = byte_per_sec * 8          # データ部のみ（8bit換算）
-        total_bps = byte_per_sec * 10        # UART全体（8N1の場合）
-        # print(f"{kbps:.2f} KB/s")
-        # print(f"{data_bps:.2f} bps")
-        print(f"{total_bps:.2f} bps")
-        count = 0
-        start = time.time()
-
diff --git a/speed_test_script/test1_send_random.py b/speed_test_script/test1_send_random.py
deleted file mode 100644
index 34db538..0000000
--- a/speed_test_script/test1_send_random.py
+++ /dev/null
@@ -1,9 +0,0 @@
-import serial, os
-
-# COMポートを指定（例: COM3）
-ser = serial.Serial("COM17", 115200)
-# ser = serial.Serial("COM18", 115200)
-
-while True:
-    ser.write(os.urandom(1024))
-

From d966a6e0253c0e94f85106c91f163326beb40481 Mon Sep 17 00:00:00 2001
From: Yoshihiro Nakagawa <taku3wzr@gmail.com>
Date: Wed, 17 Dec 2025 19:36:36 +0900
Subject: [PATCH 12/12] undo for pull request 2

undo for pull request 2
---
 ESP-Serial-Bridge.ino                    | 3 ---
 ESP32-Serial-WiFi-Client/client_config.h | 2 +-
 config.h                                 | 3 +--
 3 files changed, 2 insertions(+), 6 deletions(-)

diff --git a/ESP-Serial-Bridge.ino b/ESP-Serial-Bridge.ino
index b80672c..20f8814 100644
--- a/ESP-Serial-Bridge.ino
+++ b/ESP-Serial-Bridge.ino
@@ -57,7 +57,6 @@ BluetoothSerial SerialBT;
 HardwareSerial Serial_one(1);
 HardwareSerial Serial_two(2);
 HardwareSerial* COM[NUM_COM] = {&Serial, &Serial_one, &Serial_two};
-//HardwareSerial* COM[NUM_COM] = {&Serial};
 #elif defined(ESP8266)
 SoftwareSerial Serial_zero(SERIAL0_RXPIN, SERIAL0_TXPIN);
 SoftwareSerial Serial_one(SERIAL1_RXPIN, SERIAL1_TXPIN);
@@ -72,7 +71,6 @@ WiFiServer server_1(SERIAL1_TCP_PORT);
 #ifdef ESP32
 WiFiServer server_2(SERIAL2_TCP_PORT);
 WiFiServer* server[NUM_COM] = {&server_0, &server_1, &server_2};
-//WiFiServer* server[NUM_COM] = {&server_0};
 #elif defined(ESP8266)
 WiFiServer* server[NUM_COM] = {&server_0, &server_1};
 #endif
@@ -84,7 +82,6 @@ uint8_t buf2[NUM_COM][BUFFERSIZE];
 
 #ifdef ESP32
 uint16_t i1[NUM_COM] = {0, 0, 0};
-//uint16_t i1[NUM_COM] = {0};
 #elif defined(ESP8266)
 uint16_t i1[NUM_COM] = {0, 0};
 #endif
diff --git a/ESP32-Serial-WiFi-Client/client_config.h b/ESP32-Serial-WiFi-Client/client_config.h
index a277dc8..7083b77 100644
--- a/ESP32-Serial-WiFi-Client/client_config.h
+++ b/ESP32-Serial-WiFi-Client/client_config.h
@@ -28,7 +28,7 @@
 #define CLIENT_BAUD 115200
 #define CLIENT_PARAM SERIAL_8N1
 #define CLIENT_TXPIN 1
-#define CLIENT_RXPIN 21
+#define CLIENT_RXPIN 3
 
 /**************************  DO NOT EDIT BELOW HERE **************************/
 // perhaps a clever way to include/exclude serial debug messages...
diff --git a/config.h b/config.h
index 6a440e3..b8aed6a 100644
--- a/config.h
+++ b/config.h
@@ -33,7 +33,7 @@
 
 #define MODE_AP               // MODE_STA or MODE_AP
 #define PROTOCOL_TCP           // uncomment to enable TCP server
-#define MAX_NMEA_CLIENTS 1     // max TCP clients
+#define MAX_NMEA_CLIENTS 4     // max TCP clients
 //#define PROTOCOL_UDP           // uncomment to enable UDP broadcast (ESP32 only)
 //#define BLUETOOTH 0          // uncomment to create a bluetooth serial bridge on the indicated serial port (ESP32 only)
 //#define BATTERY_SAVER        // uncomment to reduce wifi power
@@ -43,7 +43,6 @@
 
 #ifdef ESP32
 #define NUM_COM   3    // 3 available on ESP32
-//#define NUM_COM   1    // 3 available on ESP32
 #elif defined(ESP8266)
 #define NUM_COM   2    // we only use 2 on ESP8266
 #endif