SHAC and MQTT Scripts

Moving this thread public to share . . .

Yes, at this point I'm not handling the ramp timing since I'm not sure that's something that Home Assistant can handle, its more of a C-Bus quirk I thought. In any case you would currently send ramp messages like:

cbus/write/254/56/20/ramp 89
cbus/write/254/56/20/switch OFF
cbus/write/254/56/20/switch ON

You would set up your switch yaml like the following . . .

Code:

  - platform: mqtt
    name: 'Kitchen'
    command_topic: 'cbus/write/254/56/20/switch' # Topic to publish commands
    state_topic: 'cbus/read/254/56/20/state' # Topic to read the current state
    brightness_state_topic: 'cbus/read/254/56/20/level' # Topic to read the current state
    brightness_command_topic: 'cbus/write/254/56/20/ramp' # Topic to publish commands
    brightness_scale: 255
    on_command_type: brightness
    retain: false # or false if you want to wait for changes
    payload_off: 'OFF' # or "off", depending on your MQTT device
    payload_on: 'ON' # or "on", depending on your MQTT device

 

So no ramp timing in the payload. Would be nice to add it if possible as not everyone is using Home Assistant to communicate with C-bus.

I would hope that scripting could accept just the ramp value and if present the ramp rate as well. That way is HA cant use it, its not needed and for others that can use it , its an option

Thanks for the script though

 

Getting the ramp rate data and including that as part of a payload with MQTT would be reasonably easy to do, but is there a method at the other end to interpret this data?

My scripts that I have here create a JSON model that include values such as timestamp and the topic but I had code sitting in AWS which interpretted these values.

 

If you want to pass the ramp rate, you can use event.datahex from the event script, the last 2 bytes are the ramp rate so if datahex was EFEF0008 ramp rate rate would be 0008, 8 sec

require('socket').udp():sendto(event.dst .. "/" .. event.getvalue()..”/”..event.datahex, '127.0.0.1', 5432)

then process it in cbus2mqtt script to send to MQTT topic.

 

The conversion to extract the ramp rate in sec

rrate = tonumber(string.sub(event.datahex, 5 , 8), 16 )
log(rrate)

 

There is also a dedicated function in Lua for this as well

rrate = GetCBusRampRate(0, 56, 1)