Add LoRa telemetry, fault counters, and time sync status

src/lora_transport.cpp

@@ -50,8 +50,8 @@ bool lora_send(const LoraPacket &pkt) {
 
   LoRa.beginPacket();
   LoRa.write(buffer, idx);
-  LoRa.endPacket();
-  return true;
+  int result = LoRa.endPacket();
+  return result == 1;
 }
 
 bool lora_receive(LoraPacket &pkt, uint32_t timeout_ms) {
@@ -91,6 +91,8 @@ bool lora_receive(LoraPacket &pkt, uint32_t timeout_ms) {
         return false;
       }
       memcpy(pkt.payload, &buffer[5], pkt.payload_len);
+      pkt.rssi_dbm = static_cast<int16_t>(LoRa.packetRssi());
+      pkt.snr_db = LoRa.packetSnr();
       return true;
     }