RFXCom and new device

Configuration
1

Still waiting on the new RFXCOM (DHL has lost it)...

I was looking into the old RFXCOM 433XL, that I have, to see if I could make a backup of it's settings. I don't think there is such possibillity, but that's for later....

But now I found out that another device I've had at home for quite a while is available in RFXmngr, I did not know that, but it would mean a lot to me to have it in Homeassistant.

In RFXmngr the device is detected as:

23/05/2026 11:51:30:108= 084201080344E70061
Packettype    = Thermostat3
subtype       = Mertik G6R-H4TB, G6R-H4T5, G6R-H4T, G6R-H4TV21-Z22
Sequence nbr  = 8
ID            = 0x344E7 decimal:214247
Command       = Off
Signal level  = 6  -72dBm
================================================

And I can send commands like:

23/05/2026 11:54:34:727= Thermostat3 command: 08 42 01 08 03 44 E7 00 00  HA code:084201080344E70000
================================================
Packettype    = Thermostat3
subtype       = Mertik G6R-H4TB, G6R-H4T5, G6R-H4T, G6R-H4TV21-Z22
Sequence nbr  = 8
ID            = 0x344E7 decimal:214247
Command       = Off
Signal level  = +10 dBm
------------------------------------------------
23/05/2026 11:54:35:434= 0402010800
Packettype        = Receiver/Transmitter Message
subtype           = Transmitter Response
Sequence nbr      = 8
response          = ACK, data correct transmitted

But although I have set the toggle to add devices automatically, this one does not show up.

Does someone know a solution to this?

2

I kind of got it working:

id: "1779567035293"
alias: Kachel uit
description: "Kachel uit"
triggers:
  - domain: mqtt
    device_id: 8672beb2121e1709e0fd0254ef4cbc9c
    type: action
    subtype: button_4_single
    trigger: device
conditions: []
actions:
  - action: rfxtrx.send
    data:
      event: 0842012C0344E70061
mode: single

But if it is the correct event for the long term?

Now I need to figure out how to create a group of controls that let me turn the fireplace on and off, but also to decrease the flames....

But that has no hurry, I hope I don't need the fireplace for 4 months.... :crossed_fingers: