Here is a tutorial to show you how to use M5Stack core2 with their W5500 Lan Modules.

This is the link that you can buy it;)

https://shop.m5stack.com/products/lan-module?variant=16804778803290

Note

if Core2 or Core2-for-aws is your main controller to plug with this module, DC power input must be used and set the input mode as power mode.

(otherwise the module will not start normally)

Note: When using the CORE2 or CORE2-FOR-AWS main control to drive the module, please use the DC power input of the base and set the power mode to input mode (refer to the code below), otherwise it will not start normally

You can easily find this type of power supply from Amazon;).

Example to power mode

Here is the Example Code to show you how to set the M5Stack as Power Mode.

//mbus_mode_t:
//kMBusModeOutput: Use USB or battery power
//kMBusModeInput: Use external power supply 5V, or DC interface

M5.begin(true, true, true, false, kMBusModeInput);

//Initialize Serial according to the actual connected pins
Serial2.begin(115200, SERIAL_8N1, 13, 14);

Configuration

Here is the configuration in this tutorial. I will use M5Stack W5500 LAN Module to connect with Raspberry, and publish the message by using MQTT.

Reference Link

MQTT#Broker Setup

MQTT#Connection is refuesd solution

MQTT#using Python Library as a Subscriber and Publisher

Code

#include <M5Core2.h>
#include <SPI.h>
#include <Ethernet2.h>
#include <PubSubClient.h>

#define SCK 18
#define MISO 19
#define MOSI 23
#define CS 26

byte mac[] = { 0x90, 0xA2, 0xDA, 0x0F, 0x08, 0xE1 };
IPAddress Local(192, 168, 1, 211);
EthernetClient ethClient;
PubSubClient mqttClient(ethClient);

//MQTT Broker
const char *ENDPOINT=”192.168.001.050″;
const int PORT=1883;
char *MYID=”M5Stack”;
char *PUBLISHTOPIC=”M5Stack/pub”;
char *SUBTOPIC=”RoboDK/Station/s1/#”;

void setup(){

//If LAN Modules is used,Please use this operation mode
M5.begin(true, true, true, false, kMBusModeInput);
Serial2.begin(115200, SERIAL_8N1, 13, 14);

// START
M5.Lcd.fillScreen(BLACK);
M5.Lcd.setCursor(10, 10);
M5.Lcd.setTextColor(WHITE);
M5.Lcd.setTextSize(3);
M5.Lcd.printf(“Inited..\n”);
M5.Lcd.printf(“IP:192.168.1.211\n”);
M5.Lcd.printf(“Mac:90-A2-DA-x0F-08-E1\n”);

mqttClient.setServer(ENDPOINT, PORT);
SPI.begin(18, 19, 23, -1);
Ethernet.init(26);
Ethernet.begin(mac, Local);

connectMQTT();
}

void mqttLoop() {
if (!mqttClient.connected()) {
connectMQTT();
}
mqttClient.loop();

}

void connectMQTT() {
while (!mqttClient.connected()) {
Serial.print(“Connection Loop..”);
if (mqttClient.connect(MYID)) {
Serial.println(“Connected.”);
int qos = 0;
mqttClient.subscribe(SUBTOPIC, qos);
Serial.println(“Subscribed.”);
} else {
Serial.print(“Failed. Error state=”);
Serial.print(mqttClient.state());

// Wait 5 seconds before retrying
delay(1000);
}
}
}

long messageSentAt = 0;
int count = 0;
char pubMessage[128];
int led,red,green,blue;
int status=0;
void loop() {
mqttLoop();
M5.update();
long now = millis();
if (now – messageSentAt > 1000) {
if (status ==0){
M5.Lcd.fillScreen(BLACK);
M5.Lcd.fillCircle(80, 120, 30, GREEN);
M5.Lcd.fillCircle(160, 120, 30, YELLOW);
M5.Lcd.fillCircle(240, 120, 30, RED);
status=1;
}else{
M5.Lcd.fillScreen(BLACK);
M5.Lcd.drawCircle(80, 120, 30, GREEN);
M5.Lcd.drawCircle(160, 120, 30, YELLOW);
M5.Lcd.drawCircle(240, 120, 30, RED);
status=0;
}
messageSentAt = now;
sprintf(pubMessage, “{\”count\”: %d}”, count++);
Serial.print(“Publishing message to topic “);
Serial.println(PUBLISHTOPIC);
Serial.println(pubMessage);
mqttClient.publish(PUBLISHTOPIC, pubMessage);
Serial.println(“Published.”);
}
}

Result

The message is Published to the MQTT Broker if connection is established.

Publishing message to topic M5Stack/pub
{“count”: 9}
Published.
Publishing message to topic M5Stack/pub
{“count”: 10}
Published.
Publishing message to topic M5Stack/pub
{“count”: 11}
Published.
Publishing message to topic M5Stack/pub
{“count”: 12}
Published.
Publishing message to topic M5Stack/pub
{“count”: 13}
Published.
Publishing message to topic M5Stack/pub
{“count”: 14}
Published.
Publishing message to topic M5Stack/pub
{“count”: 15}
Published.