Muhammed Zain
Published © MIT

P2P Communication using LoRa E5

In this documentation, I add some Errors that I face, code, and the diagram to setup LoRa p2p communication

BeginnerFull instructions provided1 hour3,594
P2P Communication using LoRa E5

Things used in this project

Hardware components

Wio Terminal
Seeed Studio Wio Terminal
×1
Seeed XIAO RP2040
Seeed Studio Seeed XIAO RP2040
×1
Grove Shield for Seeeduino XIAO - with embedded battery management chip
Seeed Studio Grove Shield for Seeeduino XIAO - with embedded battery management chip
×1
Seeed Studio Wio Terminal LoRaWan Chassis
×1
Seeed Studio Grove Wio-E5 LoRa
×1

Software apps and online services

Arduino IDE
Arduino IDE

Story

Read more

Schematics

Wio Terminal LoRaWan Chassis without enclosure

Code

Transmitter

C/C++
#include <Arduino.h>
#include<SoftwareSerial.h>

SoftwareSerial e5(D1, D2);

static char recv_buf[512];
int counter = 0;
static int at_send_check_response(char *p_ack, int timeout_ms, char *p_cmd, ...)
{
    int ch;
    int num = 0;
    int index = 0;
    int startMillis = 0;
    va_list args;
    memset(recv_buf, 0, sizeof(recv_buf));
    va_start(args, p_cmd);
    e5.print(p_cmd);
    Serial.print(p_cmd);
    va_end(args);
    delay(200);
    startMillis = millis();
 
    if (p_ack == NULL)
        return 0;
 
    do
    {
        while (e5.available() > 0)
        {
            ch = e5.read();
            recv_buf[index++] = ch;
            Serial.print((char)ch);
            delay(2);
        }
 
        if (strstr(recv_buf, p_ack) != NULL)
            return 1;
 
    } while (millis() - startMillis < timeout_ms);
    Serial.println();
    return 0;
}

void setup(void)
{
    Serial.begin(9600);
    
    e5.begin(9600);
    Serial.print("E5 LOCAL TEST\r\n");
   at_send_check_response("+TEST: RFCFG", 1000, "AT+TEST=RFCFG,866,SF12,125,12,15,14,ON,OFF,OFF\r\n");
    delay(200);
}
 
void loop(void)
{
      char cmd[128];
      counter=counter+1;
      
      sprintf(cmd, "AT+TEST=TXLRPKT,\"%d\"\r\n", counter);
      int ret = at_send_check_response("TX DONE", 5000, cmd);
}

Receiver

C/C++
#include <Arduino.h>
#include<SoftwareSerial.h>
SoftwareSerial e5(0, 1);

static char recv_buf[512];
static bool is_exist = false;

static int at_send_check_response(char *p_ack, int timeout_ms, char *p_cmd, ...)
{
    int ch = 0;
    int index = 0;
    int startMillis = 0;
    va_list args;
    memset(recv_buf, 0, sizeof(recv_buf));
    va_start(args, p_cmd);
    e5.printf(p_cmd, args);
    Serial.printf(p_cmd, args);
    va_end(args);
    delay(200);
    startMillis = millis();
 
    if (p_ack == NULL)
    {
        return 0;
    }
    do
    {
        while (e5.available() > 0)
        {
            ch = e5.read();
            recv_buf[index++] = ch;
            Serial.print((char)ch);
            delay(2);
        }
        if (strstr(recv_buf, p_ack) != NULL)
        {
            return 1;
        }
 
    } while (millis() - startMillis < timeout_ms);
    return 0;
}
static int recv_prase(void)
{
    char ch;
    int index = 0;
    memset(recv_buf, 0, sizeof(recv_buf));
    while (e5.available() > 0)
    {
        ch = e5.read();
        recv_buf[index++] = ch;
        Serial.print((char)ch);
        delay(2);
    }
 
    if (index)
    {
        char *p_start = NULL;
        char data[32] = {
            0,
        };
        int rssi = 0;
        int snr = 0;
            p_start = strstr(recv_buf, "RSSI:");
            if (p_start && (1 == sscanf(p_start, "RSSI:%d,", &rssi)))

            p_start = strstr(recv_buf, "SNR:");
            return 1; 
    }
    return 0;
}
static int node_recv(uint32_t timeout_ms)
{
    at_send_check_response("+TEST: RXLRPKT", 1000, "AT+TEST=RXLRPKT\r\n");
    int startMillis = millis();
    do
    {
        if (recv_prase())
        {
            return 1;
        }
    } while (millis() - startMillis < timeout_ms);
    return 0;
}
void setup(void)
{
    Serial.begin(115200);
    // while (!Serial);
 
    e5.begin(9600);
    Serial.print("Receiver\r\n");
    
  
    if (at_send_check_response("+AT: OK", 100, "AT\r\n"))
    {
        is_exist = true;
        at_send_check_response("+MODE: TEST", 1000, "AT+MODE=TEST\r\n");
        at_send_check_response("+TEST: RFCFG", 1000, "AT+TEST=RFCFG,866,SF12,125,12,15,14,ON,OFF,OFF\r\n");
        delay(500);
    }
    else
    {
        is_exist = false;
        Serial.print("No E5 module found.\r\n");
    }
}
void loop(void)
{
    if (is_exist)
    {
        node_recv(2000);
    }
}

Credits

Muhammed Zain

Muhammed Zain

12 projects • 31 followers
Maker | IoT DEV | Designer | Electronics researcher | Robotics

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