Best way for inter-unit communication

[ewaldharmsen]

Hi all,

Currently I send data between 2 units with the sendto command.
But I never know if this command arrives, so I just keep sending it every 5 seconds.

Is there another way to communicate in such a way that the receiving unit send a return message?

[grovkillen]

In that case you should really consider MQTT, that protocol is doing just that - communication from 1 to MANY or MANY to MANY or MANY to 1. Super fast acknowledgement even in 10 000+ clients environment.

[ewaldharmsen]

thanks, so I believe I need to use publish instead of sendto in that case.
But how do I know the publish action succeeds?

[grovkillen]

One way is use MQTT import or have the other unit(s) to publish something when they receive a call.

[TD-er]

Note that you will need a separate computer running a broker, to use MQTT.