Blynk protocol

nazmi1995 · November 12, 2019, 7:45pm

i have a problem in understanding the blynk protocol. i’ve read about the hardware side, mobile app side and also the websockets web side protocol but still dont understand about them. can i have the easier explanation about blnyk protocols?

PeteKnight · November 12, 2019, 7:58pm

Do you actually want to know the full communication protocol code structure, or are you just interested in understanding more about how the app, server hardware and API interact?

Pete.

nazmi1995 · November 13, 2019, 2:57am

Hi mr Pete…if u say so…can i know about the full communication protocol code structure ?

PeteKnight · November 13, 2019, 6:52am

It’s documented here:

github.com

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.