Packets type

There are required fields at the beginning of each package.

• 1 byte contains the packet type
• 2-5 bytes contain the length of the packet

CONNECT PACKET

---

This is the first packet sent to the server to add a new user/contact.

0	0	0	1	0	0	0	X
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	2
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the eighth bit of the first byte contains an indication. if equal to 1, then this is a packet from the contact, if equal to 0, then the packet is from the user

• 6-7 bytes contain id of user/contact

CONNACK PACKET

---

This packet is sent by the server in response to a connect packet.

0	0	1	0	0	0	0	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the eighth bit of the first byte indicates if the server has added a new user/contact. 1 - didn't add, maybe this id is already used, 0 - everything is ok
• 6-n bytes are used only for users. They store the ids of all contacts that are currently active.

INTERCEPT PACKET

---

This packet is sent by the user to notify the server that he wants to connect to a specific contact.

0	0	1	1	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	1	0
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• 6-7 bytes store the contact id that the user wants to connect to

INTERCAPT PACKET

---

This is the server's response to the INTERCEPT packet

0	1	0	0	0	0	0	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the eighth bit of the first byte indicates whether the requested contact exists with that id. 1 - does not exist, 0 - everything is ok
• 6-n bytes store the ip address of the requested contact

SCREEN PACKET

---

This package stores a portion of the compressed contact screen image

0	1	0	1	0	0	0	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the eighth bit of the first byte indicates the packet number. 2 - the last part of the screenshot, 1 - in other cases
• 6-n bytes is part of the screenshot

PUBLISH PACKET

---

This package notifies the user of new or disconnected contacts

0	1	1	0	0	0	0	X
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	1	0
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the eighth bit of the first byte indicates whether to add a new contact or remove it. 1 - delete, 0 - do not delete
• 6-7 bytes - contact id

DISCONNECT PACKET

---

this packet is sent to the server to notify it that a user/contact has been disconnected

0	1	1	1	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0
0	0	0	0	0	0	0	0

COMMAND PACKET

---

This packet is sent by the user directly to the contact in order to perform some action on his side

1	0	0	0	0	0	0	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X
X	X	X	X	X	X	X	X

• the fourth - eighth bit of the first byte indicates what the command is. 0 - move the mouse, 1 - press a key on the keyboard, 3 - press a key on the mouse, 4 - release a key on the mouse
• 6-n bytes carry extra. information. Mouse coordinates, key number on the keyboard, left or right button on the mouse