My topology is:
T1 - T2 - T4
- T3 -
Thread MTD devices (T4) have assigned it's IPv6 address randomly.
How to address packets to T4 from T1 (FTD via NCP, wpan0 interface), if I don't know that address. How to resolve it?
I tried with Service API, but no success. Can service be registered on MTD and if yes, will the thread network assign service RLOC16 to
The simplest way -I think- is to send a broadcast request message (using a multicast address e.g. ff03::2), on which every device has to reply.
As soon as you get the response message from a device, you should be able to get the IPv6 address of the sender as well. The sender address info is located in the otMessageInfo.
See example on cli_udp_example.cpp on git.
void UdpExample::HandleUdpReceive(otMessage *aMessage, const otMessageInfo *aMessageInfo)