I have network with one coordinator and many routers in API mode. All modules are set to the same PAN id (431) and everything works great. Coordinator is connected to PC and routers are standalone devices.
But if I take another S2 module and configure it exactly the same as coordinator (with all the same settings), it cannot discover other modules in network or send data to them (tested with X-CTU). The module works if configured as router.
I need to have backup coordinator module in case something goes wrong but it's just not working.