Thermostat not showing

[zampan0]

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[zampan0]

I have a Buderus boiler GB172 and a RC35 thermostat connected. I am running version 1.9.0, using bbqkees' board.
The boiler is shown correctly, the gateway connects nicely to my MQTT broker, but the thermostat is not shown. In a telnet session, there is a message
"These 1 EMS devices were detected:
Buderus GB172/Nefit Trendline/Junkers Cerapur (DeviceID:0x08 ProductID:123 Version:04.08)", but there is thermostat showing up. Any idea what could be the isue ?
Thank you