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	#include <Arduino.h>
	#include <Wire.h>
	#include <Ethernet.h>
	#include <MQTT.h>
	#include "credentials.h"

	#define VERSION "1.0"

	#define MQTT_MONTOPIC "admin/monitoring/client/%s/state"
	#define MQTT_VERTOPIC "admin/monitoring/client/%s/version"
	#define MQTT_IPTOPIC "admin/monitoring/client/%s/ipaddr"
	#define MQTT_BROKER "mqttbroker.scimonshouse.net"
	#define MQTT_PORT 1883

	#define MQTT_BASETOPIC "sandbox/automation/attic/sensor/%s"

	void(* resetFunc) (void) = 0;

	EthernetClient net;
	byte mac[] = { 0x0E, 0xBB, 0x00, 0x00, 0x00, 0x03 };

	MQTTClient client;

	String data = "";
	bool dataAvailable = false;

	void mqttInit() {
	client.begin(MQTT_BROKER, MQTT_PORT, net);

	if (mqttConnect() != 0) {
	resetFunc();
	}

	int verTopicLen = strlen(MQTT_VERTOPIC) - 1 + strlen(MQTT_USERNAME);
	char verTopic[verTopicLen];
	sprintf(verTopic, MQTT_VERTOPIC, MQTT_USERNAME);
	verTopic[verTopicLen - 1] = 0;
	client.publish(verTopic, VERSION, true, 1);
	}

	int mqttConnect() {
	digitalWrite(2, HIGH);

	int monTopicLen = strlen(MQTT_MONTOPIC) - 1 + strlen(MQTT_USERNAME);
	char monTopic[monTopicLen];
	sprintf(monTopic, MQTT_MONTOPIC, MQTT_USERNAME);
	monTopic[monTopicLen - 1] = 0;

	Serial.println(monTopic);
	client.setWill(monTopic, "missing", true, 1);

	int attempts = 10;

	while (!client.connect(MQTT_USERNAME, MQTT_USERNAME, MQTT_PASSWORD) && attempts > 0) {
	delay(1500);
	attempts--;
	}

	if (attempts == 0 && !client.connected()) {
	delay(500);
	resetFunc();
	}

	client.publish(monTopic, "connected", true, 1);
	digitalWrite(2, LOW);

	int ipTopicLen = strlen(MQTT_IPTOPIC) - 1 + strlen(MQTT_USERNAME);
	char ipTopic[ipTopicLen];
	sprintf(ipTopic, MQTT_IPTOPIC, MQTT_USERNAME);
	ipTopic[ipTopicLen - 1] = 0;

	IPAddress ip = Ethernet.localIP();
	client.publish(ipTopic, String(ip[0]) + "." + String(ip[1]) + "." + String(ip[2]) + "." + String(ip[3]), true, 1);
	}

	String getToken(String data, char separator, int index) {
	int found = 0;
	int strIndex[] = {0, -1};
	int maxIndex = data.length() - 1;

	for(int i = 0; i <= maxIndex && found <= index; i++){
	if(data.charAt(i) == separator \|\| i == maxIndex) {
	found++;
	strIndex[0] = strIndex[1] + 1;
	strIndex[1] = (i == maxIndex) ? i + 1 : i;
	}
	}

	return found > index ? data.substring(strIndex[0], strIndex[1]) : "";
	}

	void receiveEvent(int dataLength) {
	char localData[dataLength];
	int i;
	for(i = 0; Wire.available() > 0; i++) {
	localData[i] = Wire.read();
	}

	data = String(localData).substring(0, i);
	dataAvailable = true;
	}

	void setup() {
	pinMode(2, OUTPUT);
	digitalWrite(2, HIGH);

	// connect to ethernet
	delay(250);
	if (Ethernet.begin(mac) == 0) {
	delay(5000);
	resetFunc();
	}

	// connect to MQTT broker
	mqttInit();

	Wire.begin(8);
	Wire.onReceive(receiveEvent);
	}

	void loop() {
	if (!client.connected()) {
	mqttConnect();
	}

	Ethernet.maintain();
	client.loop();

	if (dataAvailable) {
	String localData = data;
	dataAvailable = false;

	String temp = getToken(localData, '/', 0);
	String humid = getToken(localData, '/', 1);
	String pressure = getToken(localData, '/', 2);

	int topicLen = strlen(MQTT_BASETOPIC) - 1 + strlen("temperature");
	char topicTemp[topicLen];
	sprintf(topicTemp, MQTT_BASETOPIC, "temperature");
	topicTemp[topicLen - 1] = 0;
	client.publish(topicTemp, temp, false, 1);

	topicLen = strlen(MQTT_BASETOPIC) - 1 + strlen("humidity");
	char topicHumid[topicLen];
	sprintf(topicHumid, MQTT_BASETOPIC, "humidity");
	topicHumid[topicLen - 1] = 0;
	client.publish(topicHumid, humid, false, 1);

	topicLen = strlen(MQTT_BASETOPIC) - 1 + strlen("pressure");
	char topicPressure[topicLen];
	sprintf(topicPressure, MQTT_BASETOPIC, "pressure");
	client.publish(topicPressure, pressure, false, 1);
	}
	}

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	stwalkerster
	Aug 29 2020, 4:13 PM

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