Blynk Protocol & state machine description docuements

ScanLabs · April 24, 2018, 6:13pm

Hello ,

I would like to add Blynk client support on a working project fully C written and based on an MSP432 + CC3120 platform.
My target is to implement the minimum subset of features to have the minimum footprint as possible.
I tried to search for documents that describe how blynk works but I wasn’t lucky .

Is such documentation available ?

Thanks,
Paolo

PeteKnight · April 24, 2018, 6:44pm

Pete.

ScanLabs · April 25, 2018, 7:44am

Thank you Pete for your fast reply .
I already dig into the forum looking for good and complete source of tech info but I’m stuck with a broken link that point to https://github.com/blynkkk/blynk-library/blob/ …

If you have a working link to share this is really appreciated .

Tnx Paolo

Gunner · April 25, 2018, 7:54am

Apparently you didn’t follow the link above…

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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ScanLabs · April 25, 2018, 8:04am

Thanks Gunner,

indeed the link you provided refers to \blik-server\ while the link I found on the forum points to the broken \blink-library\ .
That said , the info reported on the link you provided are a subset of what I’m looking for but are a good starting point .

Thank you,
Paolo