Socket

Brawl Stars uses TCP for the client to communicate with the server and vice-versa (excluding battles; that uses UDP). A socket is an endpoint for communication between two devices. Use the socket library, or the equivelent for your programming language of choice, for lobby, team, friends, shop etc.

What’s a packet

Packets are data sent over a network that is divided into smaller segments.

Client vs Server packets

A client packet is a packet where the client sends the data and a server packet is the same, but the server sends the data.

Packet ID

The packet ID tells the server what to do with the data (eg. read token). You can find packet ID list here. The packet ID is the first 2 bytes of the packets then the next 3 bytes is the length of the packet, and finally the next 2 bytes are packet version.