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424 lines
12 KiB
424 lines
12 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 <ArduinoJson.h>
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#include <vector>
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#include <Ticker.h>
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const char *mqtt_user = 0;
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const char *mqtt_pass = 0;
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#if MQTT_USE_ASYNC
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#include <AsyncMqttClient.h>
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AsyncMqttClient mqtt;
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#else
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#include <PubSubClient.h>
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WiFiClient mqttWiFiClient;
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PubSubClient mqtt(mqttWiFiClient);
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bool _mqttConnected = false;
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#endif
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String mqttTopic;
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bool _mqttForward;
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char *_mqttUser = 0;
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char *_mqttPass = 0;
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char *_mqttWill;
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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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typedef struct {
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char * topic;
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char * message;
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} mqtt_message_t;
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std::vector<mqtt_message_t> _mqtt_queue;
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Ticker mqttFlushTicker;
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// -----------------------------------------------------------------------------
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// Public API
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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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if (!mqttTopic.endsWith("/")) mqttTopic = mqttTopic + "/";
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}
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bool mqttForward() {
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return _mqttForward;
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}
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String mqttSubtopic(char * topic) {
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String response;
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String t = String(topic);
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String mqttSetter = getSetting("mqttSetter", MQTT_USE_SETTER);
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if (t.startsWith(mqttTopic) && t.endsWith(mqttSetter)) {
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response = t.substring(mqttTopic.length(), t.length() - mqttSetter.length());
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}
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return response;
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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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#if MQTT_USE_ASYNC
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unsigned int packetId = mqtt.publish(topic, MQTT_QOS, MQTT_RETAIN, message);
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DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s (PID %d)\n"), topic, message, packetId);
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#else
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mqtt.publish(topic, message, MQTT_RETAIN);
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DEBUG_MSG_P(PSTR("[MQTT] Sending %s => %s\n"), topic, message);
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#endif
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}
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}
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void _mqttFlush() {
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if (_mqtt_queue.size() == 0) return;
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DynamicJsonBuffer jsonBuffer;
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JsonObject& root = jsonBuffer.createObject();
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for (unsigned char i=0; i<_mqtt_queue.size(); i++) {
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mqtt_message_t element = _mqtt_queue[i];
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root[element.topic] = element.message;
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}
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if (ntpConnected()) root[MQTT_TOPIC_TIME] = ntpDateTime();
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root[MQTT_TOPIC_HOSTNAME] = getSetting("hostname", HOSTNAME);
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root[MQTT_TOPIC_IP] = getIP();
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String output;
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root.printTo(output);
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String path = mqttTopic + String(MQTT_TOPIC_JSON);
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mqttSendRaw(path.c_str(), output.c_str());
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for (unsigned char i = 0; i < _mqtt_queue.size(); i++) {
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mqtt_message_t element = _mqtt_queue[i];
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free(element.topic);
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free(element.message);
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}
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_mqtt_queue.clear();
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}
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void mqttSend(const char * topic, const char * message, bool force) {
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bool useJson = force ? false : getSetting("mqttUseJson", MQTT_USE_JSON).toInt() == 1;
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if (useJson) {
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mqtt_message_t element;
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element.topic = strdup(topic);
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element.message = strdup(message);
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_mqtt_queue.push_back(element);
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mqttFlushTicker.once_ms(MQTT_USE_JSON_DELAY, _mqttFlush);
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} else {
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String mqttGetter = getSetting("mqttGetter", MQTT_USE_GETTER);
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String path = mqttTopic + String(topic) + mqttGetter;
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mqttSendRaw(path.c_str(), 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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mqttSend(topic, message, false);
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}
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void mqttSend(const char * topic, unsigned int index, const char * message, bool force) {
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char buffer[strlen(topic)+5];
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sprintf(buffer, "%s/%d", topic, index);
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mqttSend(buffer, message, force);
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}
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void mqttSend(const char * topic, unsigned int index, const char * message) {
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mqttSend(topic, index, message, false);
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}
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void mqttSubscribeRaw(const char * topic) {
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if (mqtt.connected() && (strlen(topic) > 0)) {
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#if MQTT_USE_ASYNC
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unsigned int packetId = mqtt.subscribe(topic, MQTT_QOS);
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DEBUG_MSG_P(PSTR("[MQTT] Subscribing to %s (PID %d)\n"), topic, packetId);
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#else
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mqtt.subscribe(topic, MQTT_QOS);
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DEBUG_MSG_P(PSTR("[MQTT] Subscribing to %s\n"), topic);
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#endif
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}
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}
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void mqttSubscribe(const char * topic) {
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String mqttSetter = getSetting("mqttSetter", MQTT_USE_SETTER);
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String path = mqttTopic + String(topic) + mqttSetter;
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mqttSubscribeRaw(path.c_str());
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}
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// -----------------------------------------------------------------------------
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// Callbacks
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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() {
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DEBUG_MSG_P(PSTR("[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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// Send first Heartbeat
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heartbeat();
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// Subscribe to system topics
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mqttSubscribe(MQTT_TOPIC_ACTION);
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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() {
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DEBUG_MSG_P(PSTR("[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, unsigned int len) {
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char message[len + 1];
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strlcpy(message, (char *) payload, len + 1);
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DEBUG_MSG_P(PSTR("[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_P(PSTR(" - SKIPPED\n"));
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return;
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}
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#endif
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DEBUG_MSG_P(PSTR("\n"));
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// Check system topics
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String t = mqttSubtopic((char *) topic);
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if (t.equals(MQTT_TOPIC_ACTION)) {
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if (strcmp(message, MQTT_ACTION_RESET) == 0) {
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customReset(CUSTOM_RESET_MQTT);
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ESP.restart();
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}
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}
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// Send message 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_MESSAGE_EVENT, topic, message);
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}
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}
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bool fp2array(const char * fingerprint, unsigned char * bytearray) {
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// check length (20 2-character digits ':'-separated => 20*2+19 = 59)
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if (strlen(fingerprint) != 59) return false;
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DEBUG_MSG_P(PSTR("[MQTT] Fingerprint %s\n"), fingerprint);
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// walk the fingerprint
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for (unsigned int i=0; i<20; i++) {
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bytearray[i] = strtol(fingerprint + 3*i, NULL, 16);
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}
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return true;
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}
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void mqttConnect() {
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if (!mqtt.connected()) {
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if (getSetting("mqttServer", MQTT_SERVER).length() == 0) return;
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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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DEBUG_MSG_P(PSTR("[MQTT] MQTT_MAX_TRIES met, disconnecting from WiFi\n"));
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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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if (_mqttUser) free(_mqttUser);
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if (_mqttPass) free(_mqttPass);
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char * host = strdup(getSetting("mqttServer", MQTT_SERVER).c_str());
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unsigned int port = getSetting("mqttPort", MQTT_PORT).toInt();
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_mqttUser = strdup(getSetting("mqttUser").c_str());
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_mqttPass = strdup(getSetting("mqttPassword").c_str());
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if (_mqttWill) free(_mqttWill);
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_mqttWill = strdup((mqttTopic + MQTT_TOPIC_STATUS).c_str());
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DEBUG_MSG_P(PSTR("[MQTT] Connecting to broker at %s:%d"), host, port);
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mqtt.setServer(host, port);
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#if MQTT_USE_ASYNC
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mqtt.setKeepAlive(MQTT_KEEPALIVE).setCleanSession(false);
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mqtt.setWill(_mqttWill, MQTT_QOS, MQTT_RETAIN, "0");
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if ((strlen(_mqttUser) > 0) && (strlen(_mqttPass) > 0)) {
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DEBUG_MSG_P(PSTR(" as user '%s'."), _mqttUser);
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mqtt.setCredentials(_mqttUser, _mqttPass);
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}
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DEBUG_MSG_P(PSTR("\n"));
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#if ASYNC_TCP_SSL_ENABLED
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bool secure = getSetting("mqttUseSSL", MQTT_USE_SSL).toInt() == 1;
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mqtt.setSecure(secure);
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if (secure) {
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DEBUG_MSG_P(PSTR("[MQTT] Using SSL\n"));
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unsigned char fp[20];
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if (fp2array(getSetting("mqttFP").c_str(), fp)) {
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mqtt.addServerFingerprint(fp);
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}
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}
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#endif
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mqtt.connect();
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#else
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bool response;
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if ((strlen(_mqttUser) > 0) && (strlen(_mqttPass) > 0)) {
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DEBUG_MSG_P(PSTR(" as user '%s'\n"), _mqttUser);
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response = mqtt.connect(getIdentifier().c_str(), _mqttUser, _mqttPass, _mqttWill, MQTT_QOS, MQTT_RETAIN, "0");
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} else {
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DEBUG_MSG_P(PSTR("\n"));
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response = mqtt.connect(getIdentifier().c_str(), _mqttWill, MQTT_QOS, MQTT_RETAIN, "0");
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}
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if (response) {
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_mqttOnConnect();
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_mqttConnected = true;
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} else {
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DEBUG_MSG_P(PSTR("[MQTT] Connection failed\n"));
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}
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#endif
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free(host);
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String mqttSetter = getSetting("mqttSetter", MQTT_USE_SETTER);
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String mqttGetter = getSetting("mqttGetter", MQTT_USE_GETTER);
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_mqttForward = !mqttGetter.equals(mqttSetter);
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}
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}
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void mqttSetup() {
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#if MQTT_USE_ASYNC
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mqtt.onConnect([](bool sessionPresent) {
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_mqttOnConnect();
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});
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mqtt.onDisconnect([](AsyncMqttClientDisconnectReason reason) {
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if (reason == AsyncMqttClientDisconnectReason::TCP_DISCONNECTED) {
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DEBUG_MSG_P(PSTR("[MQTT] TCP Disconnected\n"));
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}
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if (reason == AsyncMqttClientDisconnectReason::MQTT_IDENTIFIER_REJECTED) {
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DEBUG_MSG_P(PSTR("[MQTT] Identifier Rejected\n"));
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}
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if (reason == AsyncMqttClientDisconnectReason::MQTT_SERVER_UNAVAILABLE) {
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DEBUG_MSG_P(PSTR("[MQTT] Server unavailable\n"));
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}
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if (reason == AsyncMqttClientDisconnectReason::MQTT_MALFORMED_CREDENTIALS) {
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DEBUG_MSG_P(PSTR("[MQTT] Malformed credentials\n"));
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}
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if (reason == AsyncMqttClientDisconnectReason::MQTT_NOT_AUTHORIZED) {
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DEBUG_MSG_P(PSTR("[MQTT] Not authorized\n"));
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}
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if (reason == AsyncMqttClientDisconnectReason::TLS_BAD_FINGERPRINT) {
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DEBUG_MSG_P(PSTR("[MQTT] Bad fingerprint\n"));
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}
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_mqttOnDisconnect();
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});
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mqtt.onMessage([](char* topic, char* payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
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_mqttOnMessage(topic, payload, len);
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});
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mqtt.onSubscribe([](uint16_t packetId, uint8_t qos) {
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DEBUG_MSG_P(PSTR("[MQTT] Subscribe ACK for PID %d\n"), packetId);
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});
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mqtt.onPublish([](uint16_t packetId) {
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DEBUG_MSG_P(PSTR("[MQTT] Publish ACK for PID %d\n"), packetId);
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});
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#else
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mqtt.setCallback([](char* topic, byte* payload, unsigned int length) {
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_mqttOnMessage(topic, (char *) payload, length);
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});
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#endif
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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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#if not MQTT_USE_ASYNC
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if (_mqttConnected) {
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_mqttOnDisconnect();
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_mqttConnected = false;
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}
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#endif
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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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#if not MQTT_USE_ASYNC
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} else {
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mqtt.loop();
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#endif
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}
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}
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}
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