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The internal name was changed from "temperature" to "roomtemp" 6 years ago.

I did some experimenting and found the following: You mentioned you have a linux machine. Then you can sniff network traffic as root: tcpdump -n port 1500 Then, in another terminal window and as a regular user, run the following command: echo /wEBAg== | base64 -d | nc -u -b -w2 255.255.255.255 1500 ...

The USR-TCP232 should ping. If it doesn't, there was almost certainly something wrong with your IP configuration. Your PC needs to have an IP address in the 192.168.0.0/24 subnet (it doesn't have to be fixed). As you didn't provide details on what you did, I can't be more specific on what may be wro...

Sending "actual temp", "requested temp" (and "outside temp") does not suffice to replace a physical thermostat, because those parameters are not what a boiler is controlled by. You could instruct the OTGW to stop sending those parameters to the boiler and heating would ...

One thing doesn't rule out the other. The bit indicates Master low-off &pump control. This means that the thermostat is allowed to switch to a kind of on/off heating mode at the lowest power level, if that lowest power level is still too high for a continuous heating requirement. The thermostat ...

So the heat pump is neither controlled by MsgID 1 nor MsgID 16. Then it beats me how it determines when to heat and by how much. Maybe you can figure it out with more experimenting: Does the room temperature get adjusted when you change the room setpoint on the thermostat while the OTGW is still sen...

As I explained before, the TC command will only have effect if the thermostat requests MsgID 9. Yours doesn't. Whether the BS command has effect will only become clear by observing if the room temperature eventually goes to the value provided in the BS command, rather than the room setpoint from the...

That makes no sense. Standalone mode is when the OTGW works without a thermostat, so then it doesn't have the thermostat's temperature.

I don't understand why you think you have to write custom firmware for the OTGW. Did the BS command not do what you want? I don't see any BS commands in your log.

Your log shows the OTGW operating in stand-alone mode. You can tell from the "Thermostat disconnected" message and the fact that there are no T reports. So, this shows the OTGW sending MsgID 1, not the thermostat. See this explanation for more information about how heating regulation norma...

As the documentation for the TT and TC commands indicates: "These functions are only available if supported by the thermostat". In this case that means that the thermostat reads MsgID 9. The data in the equipment matrix, that was extracted from the logs you must have uploaded, shows that y...

The ID3 data has format flag8/u8. So the high byte is a set of bit flags. The low byte is an unsigned 8-bit integer. The value shown is 00001001/4, where 00001001 represents the bit flags and 4 is the value of the unsigned 8-bit integer. The flags are numbered starting at 0 for the least significant...

> As expected, Central heating enable is always checked Central heating enable always being checked is not what I expect. This may be done for boilers that do their own low-off and pump control function. But in the equipment matrix I see for your model boiler that ID3:HB4 = 0, meaning that it allows...

Thanks for the confirmation.

The other change (6.5.1) only has effect with boilers that support MsgIDs 93, 94, and 95. For those MsgIDs, the OTGW will read all characters following a PM command.

I already made a fix. I didn't realize it was that important to you. Please try the attached firmware and let me know if that works for you.

The troubleshooting instructions refer to open boiler connections. You must have been measuring with the Toon still connected. In that case the voltage should normally be below 8V, with periodic short bursts to 15 to 18V. But those burst will be too short for a regular multimeter to register.