Solved problems

General:

sending multiple Tuya messages without waiting for responses did lead to message overwrite inside the MCU. This is resolved by always waiting for a response.

Athom EU dimmer:

My original issue with the Athom EU Dimmer was that the MCU would stop controlling the light completely, effectively inactive until a power-off reboot. This would happen every time it was controlled via Alexa/Node-Red (and maybe HA involved, not sure). Buttons and WebUI control seemed fine. What I found was that if the MCU received an 'off' command whilst it was in an 'off' state, it stopped controlling the light. It still responded to commands, and acted like it was working, but just no longer controlled the SCR.

This is resolved by the updated driver only setting DPs if they are different to the last rxed value.