Hi, I have a problem with transmitting and receiving data in my xbee network. The network consists of 1 coordinator (mains powered) and 8 End devices battery powered. The modules that I use are 868 xbee LP S2 series with the latest firmware. The configuration is: Coordinator sleep options 0, encryption enabled End device is a indirect message poller also with no sleeping options (bedause the uC turns the power to the xbee module off/on). The goal that Im trying to achieve is: - uC wakes up, powers xbee, does some sensors measurements, sends data to the coordinator using API frame 0x10 in unicast. - coordinator processes the frame and sends a replay in 0x10 frame that all is ok and sais "you can go to sleep". - after receiving that confirmation frame the ED goes to sleep for about 2 minutes. The problem is that the frame is not received by the End Device in unicast mode. And in multicast the module goes to sleep to early because the multicast frame was read by him but was to be meant for the other module. Is there something missing? Does sending a 0x10 frame take care of route discovery and joining the network? Or do I have to do something prior from sending the 0x10 frame after power reset of the end device?