#if defined(ARDUINO_ARCH_ESP32)
　#define M0_PIN              32    // to LoRa Module M0
　#define M1_PIN              33    // to LoRa Module M1
　#define AUX_PIN             23    // to LoRa module AUX (not used)
　#define RXD_PIN             16    // to LoRa module TX
　#define TXD_PIN             17    // to LoRa module RX
　#define MASTER_ADDRESS   64762    //  address; 0 - 65535
　#define SLAVE_ADDRESS    19042    //  address; 0 - 65535
#elif defined (ARDUINO_ARCH_RP2040)
　#define M0_PIN              10
　#define M1_PIN              11
　#define AUX_PIN             12
　#define RXD_PIN              9
　#define TXD_PIN              8
　#define MASTER_ADDRESS   19042
　#define SLAVE_ADDRESS    64762
#endif

#define BIND_CHANNEL   25  //  channel: 0 - 30

#include "E220_900T22S.h"
E220_900T22S e220(M0_PIN,M1_PIN,AUX_PIN);

void setup() {

　Serial.begin(115200);

　// payload size 1X:197 2X:200
　e220.setFirmwareVer(E220_FIRMWAREVER_2X);
　e220.debug(&Serial);

#if defined(ARDUINO_ARCH_ESP32)
　Serial2.begin(9600, SERIAL_8N1, RXD_PIN, TXD_PIN);
#elif defined (ARDUINO_ARCH_RP2040)
　Serial2.setTX(TXD_PIN);
　Serial2.setRX(RXD_PIN);
　Serial2.begin(9600, SERIAL_8N1);
#endif
　delay(800);   // wait 800m sec

　if (!e220.setConfig(&Serial2,SLAVE_ADDRESS,
　　　　　　　　　MASTER_ADDRESS,BIND_CHANNEL)) while(1);
}

void send() {

　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　//_/ for example...                        /_/
　//_/   send data entered from the console. /_/
　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　if (Serial.available()) {
　　memset(&post,0x0,e220.packet_size);

　　// read from the console. termination CR+LF or LF
　　int len = 0;
　　while (len < e220.packet_size) {
　　　if (Serial.available()) {
　　　　post.data[len] = Serial.read();
　　　　if (post.data[len] == 0x0a) {
　　　　　post.data[len] = 0x0;
　　　　　if ((len>0)&&(post.data[len-1]==0x0d)) post.data[len-1] = 0x0;
　　　　　break;
　　　　}
　　　　len++;
　　　}
　　　delay(1);
　　}

　　e220.sendPacket(&post);
　　delay(1);
　}
}

typedef struct {
　uint16_t  address;
　uint8_t   channel;
　uint8_t   data[200];  // actually 197 bytes
} E220_PACKET;

void receive() {

　if(e220.receivePacket(&recv)) {
　　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　　//_/ custemized code here! /_/
　　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　}
}

void receive() {

　if(e220.receivePacket(&recv)) {
　　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　　//_/ custemized code here! /_/
　　//_/_/_/_/_/_/_/_/_/_/_/_/_/_/
　}
}

(E220_900T22S.cpp)
if (len < packet_size) {
　err_no = E220_ERR_PACKET_IRREGULAR;
　if (serialMon) serialMon->printf("PACKET IRREGULAR : %d bytes\n", len);
　return false;
}

(E220_900T22S.h)
#define E220_RECV_TIMEOUT     (500)  // timeout interval 500ms

(E220_900T22S.cpp)
	config.own_address              = master;                          // 1 own_address 0  (<= 65535)
	config.baud_rate                = E220_BAUDRATE_9600;              // 2 baud_rate 9600 bps
	config.air_data_rate            = E220_SF_VAL_9;                   // 3 air_data_rate (case SF:9 BW:125)
	config.subpacket_size           = E220_SUBPACKET_SIZE_200;         // 4 subpacket_size 200
	config.rssi_ambient_noise_flag  = 0x01;                            // 5 rssi_ambient_noise_flag 0:invalid 1:valid
	config.transmitting_power       = E220_TRANSMITTING_POWER_13;      // 6 transmitting_power 13 dBm
	config.own_channel              = channel;                         // 7 own_channel 0
	config.rssi_byte_flag           = 0x0;                             // 8 rssi_byte_flag 0:invalid 1:valid
	config.transmission_method_type = E220_TRANSMISSION_METHOD_TYPE_1; // 9 transmission_method_type (Destination specification mode)
	config.wor_cycle                = E220_WOR_CYCLE_500;              //10 wor_cycle 2000 ms
	config.encryption_key           = 0x0000;                          //11 encryption_key 0  (<= 65535)
	config.target_address           = slave;                           //12 target_address 0  (<= 65535)
	config.target_channel           = channel;                         //13 target_channel 0
	config.strict_mode              = 0b1;                             // strict_mode
	config.Lowvoltage_operation     = 0b0;                             // Lowvoltage_operation enable = 0
	config.recv_target_address      = 0b0;                             // recv_target_address disable
	config.send_data_checksum       = 0b0;                             // send_data_checksum disable
	config.recv_data_checksum       = 0b0;                             // recv_data_checksum disable
	config.recv_data_packetsize     = 0b0;                             // recv_data_packetsize disable
	config.aux_low_holdtime         = 0b10;                            // aux_low_holdtime 00 default:2-3msec
	config.carriresense_timeout     = 0x00;                            // carriresense_timeout 00 (default)