add Routastic hardware model

Author: Jorropo

meshtastic/mesh.proto

@@ -656,6 +656,14 @@ enum HardwareModel {
    */
   WISMESH_TAP = 84;
 
+  /*
+   * Similar to PORTDUINO but used by Routastic devices, this is not any
+   * particular device and does not run Meshtastic's code but supports
+   * the same frame format.
+   * Runs on linux, see https://github.com/Jorropo/routastic
+   */
+  ROUTASTIC = 85;
+
   /*
    * ------------------------------------------------------------------------------------------------------------------------------------------
    * Reserved ID For developing private Ports. These will show up in live traffic sparsely, so we can use a high number. Keep it within 8 bits.