Update ESP32 platform and LoRa batching

include/lora_transport.h

@@ -3,7 +3,7 @@
 #include <Arduino.h>
 #include "config.h"
 
-constexpr size_t LORA_MAX_PAYLOAD = 200;
+constexpr size_t LORA_MAX_PAYLOAD = 230;
 
 struct LoraPacket {
   uint8_t protocol_version;
@@ -20,3 +20,4 @@ void lora_init();
 bool lora_send(const LoraPacket &pkt);
 bool lora_receive(LoraPacket &pkt, uint32_t timeout_ms);
 void lora_sleep();
+uint32_t lora_airtime_ms(size_t packet_len);