Hi,
I am using the nb-iot module with m5stack. The program is https://github.com/m5stack/M5-ProductExampleCodes/blob/master/Module/NB_IOT/Arduino/NB_IOT.ino

But I can't understand the mistake.
Can someone help me?

To start understanding the functioning of the sim800l module I used the following example:

//Reset resistance is not soldered. If necessary, weld it yourself.

#include <M5Stack.h>
#define RX_PIN 16
#define TX_PIN 17
#define RESET_PIN 5

void header(const char *string, uint16_t color){
M5.Lcd.fillScreen(color);
M5.Lcd.setTextSize(1);
M5.Lcd.setTextColor(TFT_MAGENTA, TFT_BLUE);
M5.Lcd.fillRect(0, 0, 320, 30, TFT_BLUE);
M5.Lcd.setTextDatum(TC_DATUM);
M5.Lcd.drawString(string, 160, 3, 4);
}

void setup() {
M5.begin();

header("SIM800L AT command", TFT_BLACK);
M5.Lcd.setTextFont(2);
M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
M5.Lcd.drawString("Please use serial port to Test AT command.",0, 35, 2);
// Host serial communication
Serial.begin(115200);

// SIM800L serial communication
Serial2.begin(115200, SERIAL_8N1, RX_PIN, TX_PIN);
pinMode(RESET_PIN, OUTPUT);
}

void loop() {

//AT instruction write
if(Serial.available()){
Serial2.write(Serial.read());
}

//AT instruction result
if(Serial2.available()){
Serial.write(Serial2.read());
}

delay(10);

}

I sent some at command to understand if the module worked but apparently it doesn't work. Any suggestions?

@lukasmaximus said in m5stack + sim800l:

Hi @Nicolaf899 I cannot help you here as I was not able to get the sim800l working myself, please refer to the recent topic http://forum.m5stack.com/topic/1785/sim800l-gprs-mqtt I pasted some links there with information about sim800l. Where possible please check if there is a discussion going on about this module and ask your questions there instead of duplicating a thread, thanks

okk thank you

To start understanding the functioning of the sim800l module I used the following example:

//Reset resistance is not soldered. If necessary, weld it yourself.

#include <M5Stack.h>
#define RX_PIN 16
#define TX_PIN 17
#define RESET_PIN 5

void header(const char *string, uint16_t color){
M5.Lcd.fillScreen(color);
M5.Lcd.setTextSize(1);
M5.Lcd.setTextColor(TFT_MAGENTA, TFT_BLUE);
M5.Lcd.fillRect(0, 0, 320, 30, TFT_BLUE);
M5.Lcd.setTextDatum(TC_DATUM);
M5.Lcd.drawString(string, 160, 3, 4);
}

void setup() {
M5.begin();

header("SIM800L AT command", TFT_BLACK);
M5.Lcd.setTextFont(2);
M5.Lcd.setTextColor(TFT_WHITE, TFT_BLACK);
M5.Lcd.drawString("Please use serial port to Test AT command.",0, 35, 2);
// Host serial communication
Serial.begin(115200);

// SIM800L serial communication
Serial2.begin(115200, SERIAL_8N1, RX_PIN, TX_PIN);
pinMode(RESET_PIN, OUTPUT);
}

void loop() {

//AT instruction write
if(Serial.available()){
Serial2.write(Serial.read());
}

//AT instruction result
if(Serial2.available()){
Serial.write(Serial2.read());
}

delay(10);

}

I sent some at command to understand if the module worked but apparently it doesn't work. Any suggestions?

Is there an example to use the m5stack with the sim800l module and to use the mqtt protocol?