I have been working for some time now with Xbee 868lp DM products. Now I need very low power consumption so I have set up a network consisting in an indirect message coordinator (CE=1), and several end devices with polling functions (CE=6) and async sleep (20 seconds sleep - 1 second wake).
I have configured DH/DL of the end nodes to match the coordinator MAC address to make it work (Note that this is not anywhere on the user manual for the 868lp DM module).
The nodes wake up every 20 seconds to poll for data, and transmit 1 data packet to the coordinator every 75 seconds. This seems to work fine with 3 or 4 nodes. When I power up about 10 nodes, the coordinator stop receiving any data, It does not even appear on a network scan. The sleeping nodes reports MAC ACK Failure.
If I power down several nodes, after some time (one or two minutes) the coordinator begins to receive data again. Can anyone help with this problem or have better documentation about async sleep / indirect messaging?? I found the user manual very imprecise and lacking of information in this topic.
Thanks in advance for your help.