Allow changing low/med/high via MQTT

[wimb0]

Add MQTT topic to allow changing the speed to low/med/high as set in the web interface setting.
For example something like "itho/speed" and then (off,) low, med or high as values.
This also gives better integration with the Home Assistant Fan component.

[arjenhiemstra]

Hi Wim, this has already been implemented in the last firmware version, see this piece of code:

  else {
    if (strcmp(s_payload, "low") == 0) {
      val = systemConfig.itho_low;
    }
    else if (strcmp(s_payload, "medium") == 0) {
      val = systemConfig.itho_medium;
    }
    else if (strcmp(s_payload, "high") == 0) {
      val = systemConfig.itho_high;
    }
    else {
      val = strtoul (s_payload, NULL, 10);
    }

So if the MQTT command is not low, medium or high then it will try to translate the input to a number. If that also fails nothing gets processed.

update: formatting was kinda bad, hopefully better readable now

[wimb0]

Nice! Didn't see that, sorry.
I'll update my HA code to work with those values, thanks!
This issue can be closed then.

[arjenhiemstra]

No problem! Documentation also needs to be updated on this point. Furthermore I'm working on implementing timer commands and the possibility to queue commands with a time2live on the queue.