Troobleshooting HelloDoor controlling an IP Relay

HelloDoor can control an IP-relay, and this relay can open a door, gate, or control about any device which can be activated from a simple switch. For this to work, the whole setup of the HelloDoor, IP relay and networking needs to work. Rather than setting everything up and keep your fingers crossed, here is a step by step procedure to do a clean installation, or to troubleshoot one that’s not working.