From 152abbfed004075715cf82fedbfbd7005510f6c9 Mon Sep 17 00:00:00 2001
From: Fernando Nunes <domusonline@gmail.com>
Date: Thu, 2 Apr 2026 12:43:25 +0100
Subject: [PATCH] Comment on SNR special values in RouteDiscovery to signal
 different hop types

---
 meshtastic/mesh.proto | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/meshtastic/mesh.proto b/meshtastic/mesh.proto
index 7206f4a..f0b0635 100644
--- a/meshtastic/mesh.proto
+++ b/meshtastic/mesh.proto
@@ -975,6 +975,10 @@ message RouteDiscovery {
 
   /*
    * The list of SNRs (in dB, scaled by 4) in the route towards the destination.
+   * Special values (ouside normal SNR range) are used as flags:
+   * -128 : Unknonw SNR
+   * -127 : MQTT hop
+   *  127 : UDP hop
    */
   repeated int32 snr_towards = 2;
 
@@ -985,6 +989,10 @@ message RouteDiscovery {
 
   /*
    * The list of SNRs (in dB, scaled by 4) in the route back from the destination.
+   * Special values (ouside normal SNR range) are used as flags:
+   * -128 : Unknonw SNR
+   * -127 : MQTT hop
+   *  127 : UDP hop
    */
   repeated int32 snr_back = 4;
 }