meshtastic
[Feature Request]: Show two-way traceroute with SNR per hop if available
Description
Since 2.5, when performing a traceroute, nodes will record the SNR per hop, as well as the route back. It would be nice to show this if available. For example, it could show:
1 Hop towards, 2 Hops back
Route towards: You --> Node 1 (-10.75dB) --> Node 2 (-5.25dB)
Route back: Node 2 --> Node 3 (-2dB) --> Node 1 (-1.5dB) --> You (-8dB)
Since old firmware won’t add the SNR and the route back, there is some validation needed. For the SNR to be valid, the SNR list should be one longer than the route list (because the destination adds SNR as well). For the route back to be valid, also hopStart needs to be populated, because only then nodes can add unknown nodes and SNR. Unknown SNR is represented by the value -128 and unknown nodes by 0xFFFFFFFF (4294967295). The SNR values are in dB, but they are scaled by 4, so it has to be divided by 4 before showing it. A reference implementation in Python can be found here.
