RE: nRF52840 relay LPN data over Friend node

Hung Bui — Wed, 04 Mar 2020 10:38:57 GMT

Hi Brocc,

Q1. Each LPN has to establish a friendship with a friend node. If the LPNs have friendship with FN[2] it doesn't matter where FN[1] is if it's still in the network range, it's can receive the data from LPNs. However, if the LPNs have the friendship with FN[1] and FN[1] move out of range of the LPNs. Then the LPNs will be disconnected from the network. Until it establish a new friendship with FN[2] (the friendship with FN[1] will timed out after a while)

In our stack this re-initialize friendship is not done automatically you need to do it in the application.

Q2. You can check the function generic_onoff_state_set_cb(). It's the function that call onoff_state_value_update() to print the log. Inside generic_onoff_state_set_cb() you can find p_meta that contain the src - source address of the packet. It will show which LPN sends the data.

Q3. You can configure the LPN to send the data to a group address which your gateway subscribe to. It doesn't matter which FN it connect to, as long as it has established a friendship with a FN in range, it can send data to the whole network.