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Meshtasticator's requirements.txt pins meshtastic~=2.6.1, which predates the meshtastic/meshtasticd image it drives; with the old client the simulator never observed node TX packets (both e2e directions timed out). The official meshtastic firmware_harness uses the current client against the same simulator-mode meshtasticd, so install the sim deps with meshtastic floating instead of the pinned requirements file.