Blynk protocol

PeteKnight · November 13, 2019, 6:52am

It’s documented here:

blynkkk/blynk-server/blob/master/docs/README_FOR_APP_DEVS.md#protocol-messages

# Protocol messages

Every message consists of 2 parts.

+ Header :
    + Protocol command (1 byte);
    + MessageId (2 bytes);
    + Body message length (2 bytes);

+ Body : string (could be up to 2^15 bytes).

Blynk transfers binary messages with the following structure:

| Command       | Message Id    | Length/Status   | Body     |
|:-------------:|:-------------:|:---------------:|:--------:|
| 1 byte        | 2 bytes       | 2 bytes         | Variable |

So, message is always "1 byte + 2 bytes + 2 bytes + messageBody.length".

### Command field

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Pete.