As your installation includes similar components, may I ask what your gateway looks like?
Currently an Uno with W5100 ethernet shield, running as an MQTT client
@Kokosnoot great to hear you solved it!
Crappy design module once more...
Usually I always start googling schematics of any new modules I buy, just to prevent surprises like this!
@Jan-Gatzke Perform following tests (in this order):
Do you see a difference between 1.8 and 2.1.1 Molgans?
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