MQTT over I2C?

[Sandy Walsh]

Hey y'all,

I'd like to do MQTT over I2C, specifically for Arduino to RaspberryPi communications.

All the arduino MQTT libraries I can find are ethernet based, but I think a port would be pretty easy (with a proxy server on the RPi side). 

Does this exist already?

Does it sound feasible?

Thanks!

-S

[Nicholas O'Leary]

Hi Sandy,

I'm not aware of this already having been done. I think it would be pretty straightforward to do.

PubSubClient [1] expects an implementation of Client.h [2] to be passed in its constructor. This is why it Just Works with the ethernet hardware, as well as wifi shields and the Yun.

If you create an implementation of Client.h that talks i2c under the covers, you can just pass that to the PubSubClient as-is and it'll work.

[1] http://knolleary.net/arduino-client-for-mqtt/

[2] https://github.com/arduino/Arduino/blob/master/hardware/arduino/cores/arduino/Client.h

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[Sandy Walsh]

Thanks Nick ... I'll go that route. 

-S

[chat perlipopète]

Hi Sandy, 

did you succeeded in porting any mqtt thing to I2C ?

I'm thinking about doing analog work with Coap as it doesn't need any connection & authentication phases ... 

cheers 

Rico