ESP32 Forum

Posted: **Thu Mar 05, 2026 3:52 pm**

Hi,
I'm currently trying to use an EBYTE E220-900T22D LoRa Module with an ESP32 P4 from Waveshare but I can't get a response from the module and only get a Timeout Error.

Wiring:
TX (E220) → RX GPIO38
RX (E220) → TX GPIO37
AUX → GPIO45
M0 → GPIO32
M1 → GPIO27
VCC → 3.3V
GND → GND

Library: LoRa_E220 library by Renzo Mischianti.

Code (I am using Arduino IDE):

Code: Select all

#include "LoRa_E220.h"
#include <HardwareSerial.h>

HardwareSerial mySerial(2);

#define RX_PIN 38
#define TX_PIN 37
#define AUX_PIN 45
#define M0_PIN 32
#define M1_PIN 27

LoRa_E220 e220(
  TX_PIN, RX_PIN,
  &mySerial,
  AUX_PIN, M0_PIN, M1_PIN,
  UART_BPS_RATE_9600,
  SERIAL_8N1
  );

struct SensorData {
  float temperature;
  float humidity;
};

void setup() {
  Serial.begin(115200);
  while (!Serial) delay(10);
  Serial.println("START");

  e220.begin();
  Serial.println("e220 start");

  ResponseStructContainer c = e220.getConfiguration();
  Serial.println("getConfiguration");

  if (c.status.code == 1) {
    Configuration config = *(Configuration*)c.data;
    config.CHAN = 18;
    config.OPTION.transmissionPower = POWER_13;
    ResponseStatus rs = e220.setConfiguration(config, WRITE_CFG_PWR_DWN_SAVE);
    Serial.println(rs.getResponseDescription());
  } else {
    Serial.print("Error: ");
    Serial.println(c.status.getResponseDescription());

  }
      c.close();

}

void loop() {
  SensorData data;
  data.temperature = 23.56;
  data.humidity = 51.2;
  ResponseStatus rs = e220.sendMessage((uint8_t*)&data, sizeof(data));
  delay(5000);
}

Problem: I want to send 2 values via the E220 Module, but every time when I upload the code, the serial monitor always prints

"START
e220 start
getConfiguration
Error: Timeout!!"

The Error seems to come from here somewhere. When I remove the lines, the error message in the serial monitor also disappears:

Code: Select all

  ResponseStructContainer c = e220.getConfiguration();
  Serial.println("getConfiguration");

  if (c.status.code == 1) {
    Configuration config = *(Configuration*)c.data;
    config.CHAN = 18;
    config.OPTION.transmissionPower = POWER_13;
    ResponseStatus rs = e220.setConfiguration(config, WRITE_CFG_PWR_DWN_SAVE);
    Serial.println(rs.getResponseDescription());
  } else {
    Serial.print("Error: ");
    Serial.println(c.status.getResponseDescription());

  }
      c.close();

I have not made a receiver yet because I want this code to work before.

Earlier, instead of "Timeout" the serial monitor also printed
"assert failed: heap_caps_free heap_caps_base.c:80 (heap != NULL && "free() target pointer is outside heap areas")"

Questions:

* Is there anything wrong with my wiring or UART configuration?
* Do M0/M1 have to be set differently when reading the configuration?
* Is there anything specific required when using this module with an ESP32 P4 that I might have missed?

Any ideas would be greatly appeciated!
Thanks.

Posted: **Sat Mar 07, 2026 8:43 am**

It now works. There were a few small things that didn't work, but now everything works fine.

ESP32 Forum

TIMEOUT Error when using the EBYTE E220 LoRa Module

TIMEOUT Error when using the EBYTE E220 LoRa Module

Re: TIMEOUT Error when using the EBYTE E220 LoRa Module