@bilbolodz Yes, then you lack the checksum and you should get a init-error from the security backend.

@mfalkvidd said in Return value of bool send(MyMessage &msg, const bool ack = false);: @bilbolodz just to check: are you sure there are no repeaters or other gateways within range? I've to check more thoroughly but rather not.

Sorry to hear that, but I understand... I've been there too

I know it's very good rule.

If you want to order PCB, maybe try -Removed by moderator-. They provide rapid prototyping. Their minimum order is at least one board, the board is of good quality. To Poland about four or five days. They now have activities. Can be paid on delivery.

@mfalkvidd said in Repeatrer level limit (NRF24L01 transport): Everything in MySensors started off in the development branch If you are using dev branch please test my sketch and check changing power mode with I_SIGNAL_REPORT_REQUEST message or transportGetSignalReport(const signalReport_t signalReport) function.

@bilbolodz said in Answering request command: "ack - Set this to true if you want destination node to send ack back to this node. Default is not to request any ack" Does it mean "ask Domoticz to confirm that received my presentation message"? I have not used an ack in presentation but yes i think you are correct. Not sure if the ack would be from domoticz or just from the gateway though. Great that you also found the problem for the ack flag in domoticz