@Jasper-van-Winden the wait has helped in many cases. Nobody is 100% sure why. Maybe it gives the capacitors and the power supply time to recover from the power used when sending. Maybe it is somethong else. But it often helps :)

@Jasper-van-Winden if your sketch uses gw.begin(); the nodes will get nodeID from Domoticz (. They should be visible in Setup>Devices in Domoticz. If you have a quite new version of Domoticz (not sure when this was added but it is available in 3.4834) you can also see them if you click "Setup" on your Gateway on the Hardware page. See pictures below. Note: Sensors will need to both present themselves AND send the first value before they show up in Domoticz. [image: 1467745899037-domoticz_devices.png] [image: 1467745898907-domoticz_hardware1.png] [image: 1467745898955-domoticz_hardware2.png] Seeing st=fail in your log means that the node was unable to successfully send the message. That is usually a power or range issue. See https://forum.mysensors.org/topic/666/debug-faq-and-how-ask-for-help for information on how to read the serial debug log and how to troubleshoot power and range issues. See starting up the library on https://www.mysensors.org/download/sensor_api_15 for information on how to manually set node ID if you prefer that. I let Domoticz hand out nodeID for all my sensors.

@Jasper-van-Winden well I was wrong. I had 13m CAT 5e cable laying around and just tested it with one DHT22 and it seems to be working: [image: qot0js.jpg] [image: 2nlwnqs.jpg] To consider: The Arduino Nano is powerd with a stable DC supply and it is only one DHT22, could be different outcome when you connect 5 of them all with long wires.