Michael, Thanks for your reply.
Yes. For creating a Unleashed Network DHCP is needed. This is true.
But there is also the Option to give an AP a static IP. After setting up everything i think it should not a Problem to work with static IPs.
But think about this in my case:
The Mesh AP has a Switch connected to his LAN Interface. This is needed to provide Network connectivity to some LAN Devices.
Of course it can be possible, that the Mesh-AP has some connectivity issues (Interference, DFS Channel, etc.).
Maybe there is an issue that the AP loosing his Mesh Link (DFS Channel, Interference). After that he can't reach the Default Gateway. AP tries to reach GW over LAN (where only a Switch and some LAN Devices are connected) and can't also reach the GW.
Like you say the AP should/will restart after that because for him it seems there is no GW reachable anymore.
What happends then?
Clears the AP his Config because he want's to re-download it from Master, like Jeronimo says?
If yes, this behaviour is not really good for a Mesh AP. Without Mesh-Link-Information that AP will never be able to reach the Master to get his config.
So i always have to unmount the AP, enable DHCP, connect AP to cabled Network to reach Master and get Mesh-Info, disable DHCP, mount AP back at Pole?
Maybe my case is a little bit special but this are setups which are used in "wild-life".