Sleep LoRa before sender deep sleep

include/lora_transport.h

@@ -17,3 +17,4 @@ struct LoraPacket {
 void lora_init();
 bool lora_send(const LoraPacket &pkt);
 bool lora_receive(LoraPacket &pkt, uint32_t timeout_ms);
+void lora_sleep();

src/lora_transport.cpp

@@ -100,3 +100,7 @@ bool lora_receive(LoraPacket &pkt, uint32_t timeout_ms) {
     delay(5);
   }
 }
+
+void lora_sleep() {
+  LoRa.sleep();
+}

src/main.cpp

@@ -121,6 +121,7 @@ static void sender_cycle() {
   }
 
   delay(50);
+  lora_sleep();
   go_to_deep_sleep(SENDER_WAKE_INTERVAL_SEC);
 }