Home Automation Domotica Forum Europe, Bwired Forum

As stated in my previous post, I report via MQTT directly from the NodeMCU on the Nodo-shop Opentherm Gateway to my Home Assistant installation. I use Tasmota (https://tasmota.github.io/docs/#/Home) on the NodeMCU which has all required functionality already built-in. All that was necessary was to c...

You are right again. My boiler seems to use 1's complement instead of 2's complement.
The settings of the upper bound is determined by two dials on the boiler. The hot water upper bound is the eco setting of the boiler.

While your at it, you might also change the representation of the lower bound of the DHW and CH setpoint boundaries. These values are specified as signed 8 bit integers in the OpenTherm protocol. My boiler (Bosch 42 HRC) reports both as 0x80 or -0. While a bit strange, this is a valid representation...

I cut the Opentherm Monitor out of the loop by running Tasmota on the NodeMCU as a serial to MQTT bridge. Which Tasmota can do out of the box. I cut down on communication overhead by issuing the PS=1 command to the OTGW every minute. The response to this command summarizes the status of all relevant...

I started this week with the OpenTherm Gateway from NoDoShop connected to my 12 year old Bosch central heating (TA30 thermostat en 42 HRC boiler). I connect the gateway via the onboard NodeMCU (with Tasmota installed using MQTT) to my Home assistant server. I don't want to use the standard ESPEasy S...