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Hello,

I am trying to use OT GW on a remeha calenta 28 mi (or rather the French version called dedietrich 28 mi) where the thermostat is connected through wireless (DIEMATIC CDR D. iSystem), so I cannot connect it through the GW.
I would like to use the GW connected to domotciz to monitor the temperatures, water pressure etc. Maybe to modify temperature through scripts, but nothing more.
I have connected the GW to the boiler, at this stage OpenTherm Monitor seams to detect the boiler when I turn it on, then a few incorrect data are received, then nothing more.
When I try to change the setpoint or date/time, the boiler does not react.

Any idea how I can use the GW without wired thermostat ?

thanks for your help

Below the logs

19:02:39.662894 PR: A=OpenTherm Gateway 4.2.3
19:02:40.543021 R80190000 Read-Data Boiler water temperature: 0.00
19:02:40.632005 BC01918E6 Read-Ack Boiler water temperature: 24.90
19:02:41.567129 R10015A00 Write-Data Control setpoint: 90.00
19:02:41.707086 BD0015A00 Write-Ack Control setpoint: 90.00
19:02:42.593214 R00060000 Read-Data Remote parameter flags: 00000000 00000000
19:02:42.706276 BC0060303 Read-Ack Remote parameter flags: 00000011 00000011
19:02:43.619274 R00110000 Read-Data Relative modulation level: 0.00
19:02:43.717239 BC0110000 Read-Ack Relative modulation level: 0.00
19:02:44.647555 R001B0000 Read-Data Outside temperature: 0.00
19:02:44.797367 B601B0000 Data-Inv Outside temperature: 0.00
19:02:45.670395 R801C0000 Read-Data Return water temperature: 0.00
19:02:46.668346 R801C0000 Read-Data Return water temperature: 0.00
19:02:47.661476 R801C0000 Read-Data Return water temperature: 0.00
19:02:48.650587 R801C0000 Read-Data Return water temperature: 0.00
19:02:49.650558 R801C0000 Read-Data Return water temperature: 0.00
19:02:50.626575 R801C0000 Read-Data Return water temperature: 0.00
19:02:51.627747 R801C0000 Read-Data Return water temperature: 0.00
19:02:52.615808 R801C0000 Read-Data Return water temperature: 0.00
19:02:53.606814 R801C0000 Read-Data Return water temperature: 0.00
19:02:54.596831 R801C0000 Read-Data Return water temperature: 0.00

I couldn't find much information on the hardware you mention. I get the impression that the wireless interface connects to a special set of terminals on the boiler, different from where you would connect an Opentherm thermostat. If you connect both, the boiler seems to have a preference for the wireless device and simply ignores the Opentherm thermostat as soon as it receives information from the wireless receiver. I can't think of any way you can use the gateway in this configuration.