fix: harden CLI and GPS handling

examples/simple_sensor/SensorMesh.cpp

@@ -784,6 +784,7 @@ void SensorMesh::onPeerDataRecv(mesh::Packet* packet, uint8_t type, int sender_i
         uint8_t temp[166];
         char *command = (char *) &data[5];
         char *reply = (char *) &temp[5];
+        *reply = 0;
         handleCommand(sender_timestamp, command, reply, i,
                       packet->getPathHashSize());