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Hello again, the root cause for the problem was pre-soldered SMD optocoupler PC827 - most probably overheated while soldering. To fix it I exchanged the SMD PC827 with SMD precision DIP socket adapter and used TTH variant of the optocoupler. Hope this will help to someone who may observe similar iss...

Hello, HW from Nodo Shop. PIC16F88P with FW gateway_v4.2.5.hex OTGW in Gateway mode Boiler: TERMET WINDSOR 25 Thermostat: Honeywell CT11011 Issue: As presented on the attached waveform (OTGW425_to_Boiler_Tx_feedback.png), pulses are not as specified in the "Opentherm Protocol v2.2", chapte...

Hello, HW from Nodo Shop. PIC16F88P with FW gateway_v4.2.5.hex OTGW in Gateway mode Boiler: TERMET WINDSOR 25 Thermostat: Honeywell CT11011 Issue: After the OTGW board is stressed with temperature about 50C the OTGW does not forward messages from Boiler to Thermostat. After cooling down below 40C co...