I'm sorry this is going to be a rant with few specifics about the my Xbee issues. The new 3DR radio is on order but it would be lovely if the $$$ Xbee investment would actually be worth it too. Any help will be greatly appreciated.
When I first got the Xbee it worked fine for a few flights. Then it stopped working. Following the unbrick procedures did not really help. But once in a blue moon it works, but usually only once.
The very frustrating part is that we (me and Mark) have seen this behavior on 3 different sets of Xbees. Trying different permutations of PC Xbee and APM Xbee did not really lead to success either (got two different sets to work once, but then never again).
Example of that I tried yesterday:
1) Plug in PC Xbee
2) Launch Planner
3) Powerup APM
4) Connect APM Xbee
5) Mav link connect -> Success (I'm happy for 60 seconds....)
6) Disconnect in Planner
7) Disconnect and reconnect APM Xbee
8) Impossible to connect again, even after shutting everything down and starting at #1
I'm not 100% certain about this but it looks like the red light is not always on on the APM Xbee. I think this was not the case when it worked. Now as soon as I power the APM Xbee up, it has a solid red light (even if PC Xbee is not even running).
Video of the lights while trying to connect from planner: