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206 lines
5.3 KiB
206 lines
5.3 KiB
/*
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MQTT MODULE
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Copyright (C) 2016-2017 by Xose Pérez <xose dot perez at gmail dot com>
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*/
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#include <ESP8266WiFi.h>
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#include <AsyncMqttClient.h>
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#include <vector>
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AsyncMqttClient mqtt;
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String mqttTopic;
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std::vector<void (*)(unsigned int, const char *, const char *)> _mqtt_callbacks;
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#if MQTT_SKIP_RETAINED
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unsigned long mqttConnectedAt = 0;
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#endif
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// -----------------------------------------------------------------------------
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// MQTT
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// -----------------------------------------------------------------------------
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bool mqttConnected() {
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return mqtt.connected();
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}
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void mqttDisconnect() {
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mqtt.disconnect();
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}
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void buildTopics() {
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// Replace identifier
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mqttTopic = getSetting("mqttTopic", MQTT_TOPIC);
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mqttTopic.replace("{identifier}", getSetting("hostname"));
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}
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char * mqttSubtopic(char * topic) {
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int pos = min(mqttTopic.length(), strlen(topic));
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return topic + pos;
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}
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void mqttSendRaw(const char * topic, const char * message) {
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if (mqtt.connected()) {
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DEBUG_MSG("[MQTT] Sending %s => %s\n", topic, message);
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mqtt.publish(topic, MQTT_QOS, MQTT_RETAIN, message);
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}
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}
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void mqttSend(const char * topic, const char * message) {
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String path = mqttTopic + String(topic);
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mqttSendRaw(path.c_str(), message);
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}
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void mqttSubscribeRaw(const char * topic) {
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if (mqtt.connected()) {
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DEBUG_MSG("[MQTT] Subscribing to %s\n", topic);
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mqtt.subscribe(topic, MQTT_QOS);
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}
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}
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void mqttSubscribe(const char * topic) {
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String path = mqttTopic + String(topic);
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mqttSubscribeRaw(path.c_str());
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}
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void mqttRegister(void (*callback)(unsigned int, const char *, const char *)) {
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_mqtt_callbacks.push_back(callback);
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}
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void _mqttOnConnect(bool sessionPresent) {
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DEBUG_MSG("[MQTT] Connected!\n");
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#if MQTT_SKIP_RETAINED
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mqttConnectedAt = millis();
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#endif
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// Build MQTT topics
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buildTopics();
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// Say hello and report our IP and VERSION
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mqttSend(MQTT_IP_TOPIC, getIP().c_str());
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mqttSend(MQTT_VERSION_TOPIC, APP_VERSION);
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// Subscribe to system topics
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mqttSubscribe(MQTT_ACTION_TOPIC);
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// Send connect event to subscribers
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for (unsigned char i = 0; i < _mqtt_callbacks.size(); i++) {
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(*_mqtt_callbacks[i])(MQTT_CONNECT_EVENT, NULL, NULL);
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}
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}
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void _mqttOnDisconnect(AsyncMqttClientDisconnectReason reason) {
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DEBUG_MSG("[MQTT] Disconnected!\n");
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// Send disconnect event to subscribers
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for (unsigned char i = 0; i < _mqtt_callbacks.size(); i++) {
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(*_mqtt_callbacks[i])(MQTT_DISCONNECT_EVENT, NULL, NULL);
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}
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}
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void _mqttOnMessage(char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
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char message[len+1];
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strlcpy(message, payload, len+1);
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DEBUG_MSG("[MQTT] Received %s => %s", topic, message);
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#if MQTT_SKIP_RETAINED
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if (millis() - mqttConnectedAt < MQTT_SKIP_TIME) {
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DEBUG_MSG(" - SKIPPED\n");
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return;
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}
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#endif
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DEBUG_MSG("\n");
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// Check system topics
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char * p = mqttSubtopic(topic);
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if (strcmp(p, MQTT_ACTION_TOPIC) == 0) {
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if (strcmp(payload, MQTT_ACTION_RESET) == 0) {
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ESP.reset();
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}
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}
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// Send message event to subscribers
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// Topic is set to the specific part each one might be checking
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for (unsigned char i = 0; i < _mqtt_callbacks.size(); i++) {
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(*_mqtt_callbacks[i])(MQTT_MESSAGE_EVENT, topic, message);
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}
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}
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void mqttConnect() {
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if (!mqtt.connected()) {
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// Last option: reconnect to wifi after MQTT_MAX_TRIES attemps in a row
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#if MQTT_MAX_TRIES > 0
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static unsigned int tries = 0;
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static unsigned long last_try = millis();
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if (millis() - last_try < MQTT_TRY_INTERVAL) {
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if (++tries > MQTT_MAX_TRIES) {
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wifiDisconnect();
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tries = 0;
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return;
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}
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} else {
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tries = 0;
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}
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last_try = millis();
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#endif
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mqtt.disconnect();
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char * host = strdup(getSetting("mqttServer", MQTT_SERVER).c_str());
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if (strlen(host) == 0) return;
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unsigned int port = getSetting("mqttPort", MQTT_PORT).toInt();
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char * user = strdup(getSetting("mqttUser").c_str());
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char * pass = strdup(getSetting("mqttPassword").c_str());
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DEBUG_MSG("[MQTT] Connecting to broker at %s", host);
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mqtt.setServer(host, port);
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mqtt.setKeepAlive(MQTT_KEEPALIVE).setCleanSession(false);
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mqtt.setWill((mqttTopic + MQTT_HEARTBEAT_TOPIC).c_str(), MQTT_QOS, MQTT_RETAIN, "0");
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if ((strlen(user) > 0) && (strlen(pass) > 0)) {
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DEBUG_MSG(" as user '%s'.", user);
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mqtt.setCredentials(user, pass);
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}
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DEBUG_MSG("\n");
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mqtt.connect();
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}
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}
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void mqttSetup() {
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mqtt.onConnect(_mqttOnConnect);
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mqtt.onDisconnect(_mqttOnDisconnect);
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mqtt.onMessage(_mqttOnMessage);
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buildTopics();
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}
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void mqttLoop() {
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static unsigned long lastPeriod = 0;
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if (WiFi.status() == WL_CONNECTED) {
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if (!mqtt.connected()) {
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unsigned long currPeriod = millis() / MQTT_RECONNECT_DELAY;
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if (currPeriod != lastPeriod) {
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lastPeriod = currPeriod;
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mqttConnect();
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}
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}
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}
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}
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