Mega polls ESP32 for cached notifications on idle#15
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When the 5-minute idle timeout fires, the Mega sends a single 'P' byte to the ESP32 over Serial1 instead of clearing the display. The ESP32 caches the last received MQTT batch and re-sends it on demand, so the display always shows the most recent notifications. Memory cost on ESP32: one String (~6KB max) against 177KB free heap. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Summary
Replaces the 5-minute idle screen with an on-demand poll. When the idle timeout fires, the Mega sends a single
'P'byte to the ESP32 over Serial1. The ESP32 caches its last received MQTT batch and re-sends it — the display always shows real notifications.Changes
main.cpp: addsString lastBatchglobal, populated inmessageHandler().loop()checksSerial1.available()for'P'and re-sendslastBatchwhen received.Communication: addssendPollRequest()— writes'P'to Serial1LCD:checkIdle()now returnsbool, firestrueonly once per idle cycle (not every 100ms loop). RemoveddrawIdleScreen()entirely.main.cpp: callssendPollRequest()whencheckIdle()returns trueMemory
String lastBatchon ESP32 holds up to ~6KB. ESP32 has 177KB free heap — negligible cost.Test plan
POST /weather/fetch— weather row appears on TFT🤖 Generated with Claude Code