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EMS-ESP32/src/mqtt.cpp
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2021-04-21 21:17:02 +02:00

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/*
* EMS-ESP - https://github.com/emsesp/EMS-ESP
* Copyright 2020 Paul Derbyshire
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "mqtt.h"
#include "emsesp.h"
#include "version.h"
namespace emsesp {
AsyncMqttClient * Mqtt::mqttClient_;
// static parameters we make global
std::string Mqtt::mqtt_base_;
uint8_t Mqtt::mqtt_qos_;
bool Mqtt::mqtt_retain_;
uint32_t Mqtt::publish_time_boiler_;
uint32_t Mqtt::publish_time_thermostat_;
uint32_t Mqtt::publish_time_solar_;
uint32_t Mqtt::publish_time_mixer_;
uint32_t Mqtt::publish_time_sensor_;
uint32_t Mqtt::publish_time_other_;
bool Mqtt::mqtt_enabled_;
uint8_t Mqtt::dallas_format_;
uint8_t Mqtt::bool_format_;
uint8_t Mqtt::ha_climate_format_;
bool Mqtt::ha_enabled_;
uint8_t Mqtt::nested_format_;
uint8_t Mqtt::subscribe_format_;
std::deque<Mqtt::QueuedMqttMessage> Mqtt::mqtt_messages_;
std::vector<Mqtt::MQTTSubFunction> Mqtt::mqtt_subfunctions_;
uint16_t Mqtt::mqtt_publish_fails_ = 0;
bool Mqtt::connecting_ = false;
bool Mqtt::initialized_ = false;
uint8_t Mqtt::connectcount_ = 0;
uint16_t Mqtt::mqtt_message_id_ = 0;
char will_topic_[Mqtt::MQTT_TOPIC_MAX_SIZE]; // because MQTT library keeps only char pointer
uuid::log::Logger Mqtt::logger_{F_(mqtt), uuid::log::Facility::DAEMON};
// subscribe to an MQTT topic, and store the associated callback function
// only if it already hasn't been added
void Mqtt::subscribe(const uint8_t device_type, const std::string & topic, mqtt_subfunction_p cb) {
if (!enabled()) {
return;
}
// check if we already have the topic subscribed, if so don't add it again
if (!mqtt_subfunctions_.empty()) {
for (auto & mqtt_subfunction : mqtt_subfunctions_) {
if ((mqtt_subfunction.device_type_ == device_type) && (strcmp(mqtt_subfunction.topic_.c_str(), topic.c_str()) == 0)) {
// add the function (in case its not there) and quit because it already exists
if (cb) {
mqtt_subfunction.mqtt_subfunction_ = cb;
}
return;
}
}
}
LOG_DEBUG(F("Subscribing MQTT topic %s for device type %s"), topic.c_str(), EMSdevice::device_type_2_device_name(device_type).c_str());
// add to MQTT queue as a subscribe operation
auto message = queue_subscribe_message(topic);
if (message == nullptr) {
return;
}
// register in our libary with the callback function.
// We store the original topic without base
mqtt_subfunctions_.emplace_back(device_type, std::move(topic), std::move(cb));
}
// subscribe to the command topic if it doesn't exist yet
void Mqtt::register_command(const uint8_t device_type, const __FlashStringHelper * cmd, cmdfunction_p cb, uint8_t flag) {
std::string cmd_topic = EMSdevice::device_type_2_device_name(device_type); // thermostat, boiler, etc...
// see if we have already a handler for the device type (boiler, thermostat). If not add it
bool exists = false;
if (!mqtt_subfunctions_.empty()) {
for (const auto & mqtt_subfunction : mqtt_subfunctions_) {
if ((mqtt_subfunction.device_type_ == device_type) && (strcmp(mqtt_subfunction.topic_.c_str(), cmd_topic.c_str()) == 0)) {
exists = true;
}
}
}
if (!exists) {
Mqtt::subscribe(device_type, cmd_topic, nullptr); // use an empty function handler to signal this is a command function only (e.g. ems-esp/boiler)
LOG_DEBUG(F("Registering MQTT cmd %s with topic %s"), uuid::read_flash_string(cmd).c_str(), EMSdevice::device_type_2_device_name(device_type).c_str());
}
// register the individual commands too (e.g. ems-esp/boiler/wwonetime)
// https://github.com/emsesp/EMS-ESP32/issues/31
std::string topic(MQTT_TOPIC_MAX_SIZE, '\0');
if (subscribe_format_ == 2 && flag == MqttSubFlag::FLAG_HC) {
topic = cmd_topic + "/hc1/" + uuid::read_flash_string(cmd);
queue_subscribe_message(topic);
topic = cmd_topic + "/hc2/" + uuid::read_flash_string(cmd);
queue_subscribe_message(topic);
topic = cmd_topic + "/hc3/" + uuid::read_flash_string(cmd);
queue_subscribe_message(topic);
topic = cmd_topic + "/hc4/" + uuid::read_flash_string(cmd);
queue_subscribe_message(topic);
} else if (subscribe_format_ && flag != MqttSubFlag::FLAG_NOSUB) {
topic = cmd_topic + "/" + uuid::read_flash_string(cmd);
queue_subscribe_message(topic);
}
}
// subscribe to an MQTT topic, and store the associated callback function
// For generic functions not tied to a specific device
void Mqtt::subscribe(const std::string & topic, mqtt_subfunction_p cb) {
subscribe(0, topic, cb); // no device_id needed if generic to EMS-ESP
}
// resubscribe to all MQTT topics
void Mqtt::resubscribe() {
if (mqtt_subfunctions_.empty()) {
return;
}
for (const auto & mqtt_subfunction : mqtt_subfunctions_) {
queue_subscribe_message(mqtt_subfunction.topic_);
}
for (const auto & cf : Command::commands()) {
std::string topic(MQTT_TOPIC_MAX_SIZE, '\0');
if (subscribe_format_ == 2 && cf.flag_ == MqttSubFlag::FLAG_HC) {
topic = EMSdevice::device_type_2_device_name(cf.device_type_) + "/hc1/" + uuid::read_flash_string(cf.cmd_);
queue_subscribe_message(topic);
topic = EMSdevice::device_type_2_device_name(cf.device_type_) + "/hc2/" + uuid::read_flash_string(cf.cmd_);
queue_subscribe_message(topic);
topic = EMSdevice::device_type_2_device_name(cf.device_type_) + "/hc3/" + uuid::read_flash_string(cf.cmd_);
queue_subscribe_message(topic);
topic = EMSdevice::device_type_2_device_name(cf.device_type_) + "/hc4/" + uuid::read_flash_string(cf.cmd_);
queue_subscribe_message(topic);
} else if (subscribe_format_ && cf.flag_ != MqttSubFlag::FLAG_NOSUB) {
topic = EMSdevice::device_type_2_device_name(cf.device_type_) + "/" + uuid::read_flash_string(cf.cmd_);
queue_subscribe_message(topic);
}
}
}
// Main MQTT loop - sends out top item on publish queue
void Mqtt::loop() {
// exit if MQTT is not enabled or if there is no network connection
if (!connected()) {
return;
}
uint32_t currentMillis = uuid::get_uptime();
// publish top item from MQTT queue to stop flooding
if ((uint32_t)(currentMillis - last_mqtt_poll_) > MQTT_PUBLISH_WAIT) {
last_mqtt_poll_ = currentMillis;
process_queue();
}
// dallas publish on change
if (!publish_time_sensor_) {
EMSESP::publish_sensor_values(false);
}
if (!mqtt_messages_.empty()) {
return;
}
// create publish messages for each of the EMS device values, adding to queue, only one device per loop
if (publish_time_boiler_ && (currentMillis - last_publish_boiler_ > publish_time_boiler_)) {
last_publish_boiler_ = (currentMillis / publish_time_boiler_) * publish_time_boiler_;
EMSESP::publish_device_values(EMSdevice::DeviceType::BOILER);
} else
if (publish_time_thermostat_ && (currentMillis - last_publish_thermostat_ > publish_time_thermostat_)) {
last_publish_thermostat_ = (currentMillis / publish_time_thermostat_) * publish_time_thermostat_;
EMSESP::publish_device_values(EMSdevice::DeviceType::THERMOSTAT);
} else
if (publish_time_solar_ && (currentMillis - last_publish_solar_ > publish_time_solar_)) {
last_publish_solar_ = (currentMillis / publish_time_solar_) * publish_time_solar_;
EMSESP::publish_device_values(EMSdevice::DeviceType::SOLAR);
} else
if (publish_time_mixer_ && (currentMillis - last_publish_mixer_ > publish_time_mixer_)) {
last_publish_mixer_ = (currentMillis / publish_time_mixer_) * publish_time_mixer_;
EMSESP::publish_device_values(EMSdevice::DeviceType::MIXER);
} else
if (publish_time_other_ && (currentMillis - last_publish_other_ > publish_time_other_)) {
last_publish_other_ = (currentMillis / publish_time_other_) * publish_time_other_;
EMSESP::publish_other_values();
} else
if (publish_time_sensor_ && (currentMillis - last_publish_sensor_ > publish_time_sensor_)) {
last_publish_sensor_ = (currentMillis / publish_time_sensor_) * publish_time_sensor_;
EMSESP::publish_sensor_values(true);
}
}
// print MQTT log and other stuff to console
void Mqtt::show_mqtt(uuid::console::Shell & shell) {
shell.printfln(F("MQTT is %s"), connected() ? uuid::read_flash_string(F_(connected)).c_str() : uuid::read_flash_string(F_(disconnected)).c_str());
shell.printfln(F("MQTT publish fails count: %lu"), mqtt_publish_fails_);
shell.println();
// show subscriptions
shell.printfln(F("MQTT topic subscriptions:"));
for (const auto & mqtt_subfunction : mqtt_subfunctions_) {
shell.printfln(F(" %s/%s"), mqtt_base_.c_str(), mqtt_subfunction.topic_.c_str());
}
for (const auto & cf : Command::commands()) {
if (subscribe_format_ == 2 && cf.flag_ == MqttSubFlag::FLAG_HC) {
shell.printfln(F(" %s/%s/hc1/%s"), mqtt_base_.c_str(), EMSdevice::device_type_2_device_name(cf.device_type_).c_str(), uuid::read_flash_string(cf.cmd_).c_str());
shell.printfln(F(" %s/%s/hc2/%s"), mqtt_base_.c_str(), EMSdevice::device_type_2_device_name(cf.device_type_).c_str(), uuid::read_flash_string(cf.cmd_).c_str());
shell.printfln(F(" %s/%s/hc3/%s"), mqtt_base_.c_str(), EMSdevice::device_type_2_device_name(cf.device_type_).c_str(), uuid::read_flash_string(cf.cmd_).c_str());
shell.printfln(F(" %s/%s/hc4/%s"), mqtt_base_.c_str(), EMSdevice::device_type_2_device_name(cf.device_type_).c_str(), uuid::read_flash_string(cf.cmd_).c_str());
} else if (subscribe_format_ && cf.flag_ != MqttSubFlag::FLAG_NOSUB) {
shell.printfln(F(" %s/%s/%s"), mqtt_base_.c_str(), EMSdevice::device_type_2_device_name(cf.device_type_).c_str(), uuid::read_flash_string(cf.cmd_).c_str());
}
}
shell.println();
// show queues
if (mqtt_messages_.empty()) {
shell.printfln(F("MQTT queue is empty"));
shell.println();
return;
}
shell.printfln(F("MQTT queue (%d/%d messages):"), mqtt_messages_.size(), MAX_MQTT_MESSAGES);
for (const auto & message : mqtt_messages_) {
auto content = message.content_;
char topic[MQTT_TOPIC_MAX_SIZE];
if ((strncmp(content->topic.c_str(), "homeassistant/", 13) != 0)) {
snprintf_P(topic, sizeof(topic), PSTR("%s/%s"), Mqtt::base().c_str(), content->topic.c_str());
} else {
snprintf_P(topic, sizeof(topic), PSTR("%s"), content->topic.c_str());
}
if (content->operation == Operation::PUBLISH) {
// Publish messages
if (message.retry_count_ == 0) {
if (message.packet_id_ == 0) {
shell.printfln(F(" [%02d] (Pub) topic=%s payload=%s"), message.id_, topic, content->payload.c_str());
} else {
shell.printfln(F(" [%02d] (Pub) topic=%s payload=%s (pid %d)"), message.id_, topic, content->payload.c_str(), message.packet_id_);
}
} else {
shell.printfln(F(" [%02d] (Pub) topic=%s payload=%s (pid %d, retry #%d)"), message.id_, topic, content->payload.c_str(), message.packet_id_, message.retry_count_);
}
} else {
// Subscribe messages
shell.printfln(F(" [%02d] (Sub) topic=%s"), message.id_, topic);
}
}
shell.println();
}
// simulate receiving a MQTT message, used only for testing
void Mqtt::incoming(const char * topic, const char * payload) {
on_message(topic, payload, strlen(payload));
}
// received an MQTT message that we subscribed too
void Mqtt::on_message(const char * fulltopic, const char * payload, size_t len) {
if (len == 0) {
LOG_DEBUG(F("Received empty message %s"), fulltopic);
return; // ignore empty payloads
}
if (strncmp(fulltopic, mqtt_base_.c_str(), strlen(mqtt_base_.c_str())) != 0) {
LOG_DEBUG(F("Received unknown message %s - %s"), fulltopic, payload);
return; // not for us
}
char topic[100];
strlcpy(topic, &fulltopic[1 + strlen(mqtt_base_.c_str())], 100);
// strip the topic substrings
char * topic_end = strchr(topic, '/');
if (topic_end != nullptr) {
topic_end[0] = '\0';
}
// convert payload to a null-terminated char string
char message[len + 2];
strlcpy(message, payload, len + 1);
LOG_DEBUG(F("Received %s => %s (length %d)"), topic, message, len);
// see if we have this topic in our subscription list, then call its callback handler
for (const auto & mf : mqtt_subfunctions_) {
if (strcmp(topic, mf.topic_.c_str()) == 0) {
// if we have callback function then call it
// otherwise proceed as process as a command
if (mf.mqtt_subfunction_) {
if (!(mf.mqtt_subfunction_)(message)) {
LOG_ERROR(F("MQTT error: invalid payload %s for this topic %s"), message, topic);
}
return;
}
// check if it's not json, then try and extract the command from the topic name
if (message[0] != '{') {
// get topic with substrings again
strlcpy(topic, &fulltopic[1 + strlen(mqtt_base_.c_str())], 100);
char * cmd_only = strchr(topic, '/');
if (cmd_only == NULL) {
return; // invalid topic name
}
cmd_only++; // skip the /
int8_t id = -1;
// check for hcx/ prefix
if (cmd_only[0] == 'h' && cmd_only[1] == 'c' && cmd_only[3] == '/') {
id = cmd_only[2] - '0';
cmd_only += 4;
}
// LOG_INFO(F("devicetype= %d, topic = %s, cmd = %s, message = %s, id = %d"), mf.device_type_, topic, cmd_only, message, id);
if (!Command::call(mf.device_type_, cmd_only, message, id)) {
LOG_ERROR(F("No matching cmd (%s) in topic %s, id %d, or invalid data"), cmd_only, topic, id);
}
return;
}
// It's a command then with the payload being JSON like {"cmd":"<cmd>", "data":<data>, "id":<n>}
// Find the command from the json and call it directly
StaticJsonDocument<EMSESP_JSON_SIZE_SMALL> doc;
DeserializationError error = deserializeJson(doc, message);
if (error) {
LOG_ERROR(F("MQTT error: payload %s, error %s"), message, error.c_str());
return;
}
const char * command = doc["cmd"];
if (command == nullptr) {
LOG_ERROR(F("MQTT error: invalid payload cmd format. message=%s"), message);
return;
}
// check for hc and id, and convert to int
int8_t n = -1; // no value
if (doc.containsKey("hc")) {
n = doc["hc"];
} else if (doc.containsKey("id")) {
n = doc["id"];
}
bool cmd_known = false;
JsonVariant data = doc["data"];
if (data.is<char *>()) {
cmd_known = Command::call(mf.device_type_, command, data.as<char *>(), n);
} else if (data.is<int>()) {
char data_str[10];
cmd_known = Command::call(mf.device_type_, command, Helpers::itoa(data_str, (int16_t)data.as<int>()), n);
} else if (data.is<float>()) {
char data_str[10];
cmd_known = Command::call(mf.device_type_, command, Helpers::render_value(data_str, (float)data.as<float>(), 2), n);
} else if (data.isNull()) {
DynamicJsonDocument resp(EMSESP_JSON_SIZE_XLARGE_DYN);
JsonObject json = resp.to<JsonObject>();
cmd_known = Command::call(mf.device_type_, command, "", n, json);
if (cmd_known && json.size()) {
Mqtt::publish(F("response"), resp.as<JsonObject>());
}
}
if (!cmd_known) {
LOG_ERROR(F("No matching cmd (%s) or invalid data"), command);
}
return;
}
}
// if we got here we didn't find a topic match
LOG_ERROR(F("No MQTT handler found for topic %s and payload %s"), topic, message);
}
// print all the topics related to a specific device type
void Mqtt::show_topic_handlers(uuid::console::Shell & shell, const uint8_t device_type) {
if (std::count_if(mqtt_subfunctions_.cbegin(), mqtt_subfunctions_.cend(), [=](MQTTSubFunction const & mqtt_subfunction) { return device_type == mqtt_subfunction.device_type_; }) == 0) {
return;
}
shell.print(F(" Subscribed MQTT topics: "));
for (const auto & mqtt_subfunction : mqtt_subfunctions_) {
if (mqtt_subfunction.device_type_ == device_type) {
shell.printf(F("%s/%s "), mqtt_base_.c_str(), mqtt_subfunction.topic_.c_str());
}
}
shell.println();
}
// called when an MQTT Publish ACK is received
// its a poor man's QOS we assume the ACK represents the last Publish sent
// check if ACK matches the last Publish we sent, if not report an error. Only if qos is 1 or 2
// and always remove from queue
void Mqtt::on_publish(uint16_t packetId) {
// find the MQTT message in the queue and remove it
if (mqtt_messages_.empty()) {
#if defined(EMSESP_DEBUG)
LOG_DEBUG(F("[DEBUG] No message stored for ACK pid %d"), packetId);
#endif
return;
}
auto mqtt_message = mqtt_messages_.front();
// if the last published failed, don't bother checking it. wait for the next retry
if (mqtt_message.packet_id_ == 0) {
#if defined(EMSESP_DEBUG)
LOG_DEBUG(F("[DEBUG] ACK for failed message pid 0"));
#endif
return;
}
if (mqtt_message.packet_id_ != packetId) {
LOG_ERROR(F("Mismatch, expecting PID %d, got %d"), mqtt_message.packet_id_, packetId);
mqtt_publish_fails_++; // increment error count
}
#if defined(EMSESP_DEBUG)
LOG_DEBUG(F("[DEBUG] ACK pid %d"), packetId);
#endif
mqtt_messages_.pop_front(); // always remove from queue, regardless if there was a successful ACK
}
// called when MQTT settings have changed via the Web forms
void Mqtt::reset_mqtt() {
if (!mqttClient_) {
return;
}
if (mqttClient_->connected()) {
mqttClient_->disconnect(true); // force a disconnect
}
}
void Mqtt::load_settings() {
EMSESP::esp8266React.getMqttSettingsService()->read([&](MqttSettings & mqttSettings) {
mqtt_base_ = mqttSettings.base.c_str(); // Convert String to std::string
mqtt_qos_ = mqttSettings.mqtt_qos;
mqtt_retain_ = mqttSettings.mqtt_retain;
mqtt_enabled_ = mqttSettings.enabled;
ha_enabled_ = mqttSettings.ha_enabled;
ha_climate_format_ = mqttSettings.ha_climate_format;
dallas_format_ = mqttSettings.dallas_format;
bool_format_ = mqttSettings.bool_format;
nested_format_ = mqttSettings.nested_format;
subscribe_format_ = mqttSettings.subscribe_format;
// convert to milliseconds
publish_time_boiler_ = mqttSettings.publish_time_boiler * 1000;
publish_time_thermostat_ = mqttSettings.publish_time_thermostat * 1000;
publish_time_solar_ = mqttSettings.publish_time_solar * 1000;
publish_time_mixer_ = mqttSettings.publish_time_mixer * 1000;
publish_time_other_ = mqttSettings.publish_time_other * 1000;
publish_time_sensor_ = mqttSettings.publish_time_sensor * 1000;
});
}
void Mqtt::start() {
mqttClient_ = EMSESP::esp8266React.getMqttClient();
load_settings(); // fetch MQTT settings
if (!mqtt_enabled_) {
return; // quit, not using MQTT
}
// if already initialized, don't do it again
if (initialized_) {
return;
}
initialized_ = true;
mqttClient_->onConnect([this](bool sessionPresent) { on_connect(); });
mqttClient_->onDisconnect([this](AsyncMqttClientDisconnectReason reason) {
if (!connecting_) {
return;
}
connecting_ = false;
if (reason == AsyncMqttClientDisconnectReason::TCP_DISCONNECTED) {
LOG_INFO(F("MQTT disconnected: TCP"));
}
if (reason == AsyncMqttClientDisconnectReason::MQTT_IDENTIFIER_REJECTED) {
LOG_INFO(F("MQTT disconnected: Identifier Rejected"));
}
if (reason == AsyncMqttClientDisconnectReason::MQTT_SERVER_UNAVAILABLE) {
LOG_INFO(F("MQTT disconnected: Server unavailable"));
}
if (reason == AsyncMqttClientDisconnectReason::MQTT_MALFORMED_CREDENTIALS) {
LOG_INFO(F("MQTT disconnected: Malformed credentials"));
}
if (reason == AsyncMqttClientDisconnectReason::MQTT_NOT_AUTHORIZED) {
LOG_INFO(F("MQTT disconnected: Not authorized"));
}
// remove message with pending ack
if (!mqtt_messages_.empty()) {
auto mqtt_message = mqtt_messages_.front();
if (mqtt_message.packet_id_ != 0) {
mqtt_messages_.pop_front();
}
}
// mqtt_messages_.clear();
});
// create will_topic with the base prefixed. It has to be static because asyncmqttclient destroys the reference
static char will_topic[MQTT_TOPIC_MAX_SIZE];
snprintf_P(will_topic, MQTT_TOPIC_MAX_SIZE, PSTR("%s/status"), mqtt_base_.c_str());
mqttClient_->setWill(will_topic, 1, true, "offline"); // with qos 1, retain true
mqttClient_->onMessage([this](char * topic, char * payload, AsyncMqttClientMessageProperties properties, size_t len, size_t index, size_t total) {
// receiving mqtt
on_message(topic, payload, len);
});
mqttClient_->onPublish([this](uint16_t packetId) {
// publish
on_publish(packetId);
});
// create space for command buffer, to avoid heap memory fragmentation
mqtt_subfunctions_.reserve(5);
}
void Mqtt::set_publish_time_boiler(uint16_t publish_time) {
publish_time_boiler_ = publish_time * 1000; // convert to milliseconds
}
void Mqtt::set_publish_time_thermostat(uint16_t publish_time) {
publish_time_thermostat_ = publish_time * 1000; // convert to milliseconds
}
void Mqtt::set_publish_time_solar(uint16_t publish_time) {
publish_time_solar_ = publish_time * 1000; // convert to milliseconds
}
void Mqtt::set_publish_time_mixer(uint16_t publish_time) {
publish_time_mixer_ = publish_time * 1000; // convert to milliseconds
}
void Mqtt::set_publish_time_other(uint16_t publish_time) {
publish_time_other_ = publish_time * 1000; // convert to milliseconds
}
void Mqtt::set_publish_time_sensor(uint16_t publish_time) {
publish_time_sensor_ = publish_time * 1000; // convert to milliseconds
}
bool Mqtt::get_publish_onchange(uint8_t device_type) {
if (device_type == EMSdevice::DeviceType::BOILER) {
if (!publish_time_boiler_) {
return true;
}
} else if (device_type == EMSdevice::DeviceType::THERMOSTAT) {
if (!publish_time_thermostat_) {
return true;
}
} else if (device_type == EMSdevice::DeviceType::SOLAR) {
if (!publish_time_solar_) {
return true;
}
} else if (device_type == EMSdevice::DeviceType::MIXER) {
if (!publish_time_mixer_) {
return true;
}
} else if (!publish_time_other_) {
return true;
}
return false;
}
// MQTT onConnect - when an MQTT connect is established
// send out some inital MQTT messages
void Mqtt::on_connect() {
if (connecting_) { // prevent duplicated connections
return;
}
LOG_INFO(F("MQTT connected"));
connecting_ = true;
connectcount_++;
load_settings(); // reload MQTT settings - in case they have changes
// send info topic appended with the version information as JSON
StaticJsonDocument<EMSESP_JSON_SIZE_SMALL> doc;
// first time to connect
if (connectcount_ == 1) {
doc["event"] = FJSON("start");
} else {
doc["event"] = FJSON("reconnect");
}
doc["version"] = EMSESP_APP_VERSION;
#ifndef EMSESP_STANDALONE
if (EMSESP::system_.ethernet_connected()) {
doc["ip"] = ETH.localIP().toString();
} else {
doc["ip"] = WiFi.localIP().toString();
}
#endif
publish(F_(info), doc.as<JsonObject>());
// create the EMS-ESP device in HA, which is MQTT retained
if (ha_enabled()) {
ha_status();
}
// send initial MQTT messages for some of our services
EMSESP::shower_.send_mqtt_stat(false); // Send shower_activated as false
EMSESP::system_.send_heartbeat(); // send heatbeat
if (connectcount_ > 1) {
// we doing a re-connect from a TCP break
// only re-subscribe again to all MQTT topics
resubscribe();
EMSESP::reset_mqtt_ha(); // re-create all HA devices if there are any
}
publish_retain(F("status"), "online", true); // say we're alive to the Last Will topic, with retain on
mqtt_publish_fails_ = 0; // reset fail count to 0
/*
// for debugging only
LOG_INFO("Queue size: %d", mqtt_messages_.size());
for (const auto & message : mqtt_messages_) {
auto content = message.content_;
LOG_INFO(F(" [%02d] (%d) topic=%s payload=%s"), message.id_, content->operation, content->topic.c_str(), content->payload.c_str());
}
*/
}
// Home Assistant Discovery - the main master Device called EMS-ESP
// e.g. homeassistant/sensor/ems-esp/status/config
// all the values from the heartbeat payload will be added as attributes to the entity state
void Mqtt::ha_status() {
StaticJsonDocument<EMSESP_JSON_SIZE_HA_CONFIG> doc;
doc["uniq_id"] = FJSON("ems-esp-system");
doc["~"] = mqtt_base_; // default ems-esp
// doc["avty_t"] = FJSON("~/status"); // commented out, as it causes errors in HA sometimes
// doc["json_attr_t"] = FJSON("~/heartbeat"); // store also as HA attributes
doc["stat_t"] = FJSON("~/heartbeat");
doc["name"] = FJSON("EMS-ESP status");
doc["val_tpl"] = FJSON("{{value_json['status']}}");
JsonObject dev = doc.createNestedObject("dev");
dev["name"] = F_(EMSESP); // "EMS-ESP"
dev["sw"] = EMSESP_APP_VERSION;
dev["mf"] = FJSON("proddy");
dev["mdl"] = F_(EMSESP); // "EMS-ESP"
JsonArray ids = dev.createNestedArray("ids");
ids.add("ems-esp");
char topic[MQTT_TOPIC_MAX_SIZE];
snprintf_P(topic, sizeof(topic), PSTR("homeassistant/sensor/%s/system/config"), mqtt_base_.c_str());
Mqtt::publish_ha(topic, doc.as<JsonObject>()); // publish the config payload with retain flag
// create the sensors
// must match the MQTT payload keys
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("WiFi strength"), EMSdevice::DeviceType::SYSTEM, F("rssi"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("Uptime"), EMSdevice::DeviceType::SYSTEM, F("uptime"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("Uptime (sec)"), EMSdevice::DeviceType::SYSTEM, F("uptime_sec"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("Free memory"), EMSdevice::DeviceType::SYSTEM, F("freemem"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# MQTT fails"), EMSdevice::DeviceType::SYSTEM, F("mqttfails"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# Rx received"), EMSdevice::DeviceType::SYSTEM, F("rxreceived"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# Rx fails"), EMSdevice::DeviceType::SYSTEM, F("rxfails"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# Tx reads"), EMSdevice::DeviceType::SYSTEM, F("txread"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# Tx writes"), EMSdevice::DeviceType::SYSTEM, F("txwrite"));
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_HEARTBEAT, F("# Tx fails"), EMSdevice::DeviceType::SYSTEM, F("txfails"));
}
// add sub or pub task to the queue.
// a fully-qualified topic is created by prefixing the base, unless it's HA
// returns a pointer to the message created
std::shared_ptr<const MqttMessage> Mqtt::queue_message(const uint8_t operation, const std::string & topic, const std::string & payload, bool retain) {
if (topic.empty()) {
return nullptr;
}
// take the topic and prefix the base, unless its for HA
std::shared_ptr<MqttMessage> message;
message = std::make_shared<MqttMessage>(operation, topic, payload, retain);
// LOG_INFO("Added to queue: %s %s", message->topic.c_str(), message->payload.c_str()); // debugging only
// if the queue is full, make room but removing the last one
if (mqtt_messages_.size() >= MAX_MQTT_MESSAGES) {
mqtt_messages_.pop_front();
}
mqtt_messages_.emplace_back(mqtt_message_id_++, std::move(message));
return mqtt_messages_.back().content_; // this is because the message has been moved
}
// add MQTT message to queue, payload is a string
std::shared_ptr<const MqttMessage> Mqtt::queue_publish_message(const std::string & topic, const std::string & payload, bool retain) {
if (!enabled()) {
return nullptr;
};
return queue_message(Operation::PUBLISH, topic, payload, retain);
}
// add MQTT subscribe message to queue
std::shared_ptr<const MqttMessage> Mqtt::queue_subscribe_message(const std::string & topic) {
return queue_message(Operation::SUBSCRIBE, topic, "", false); // no payload
}
// MQTT Publish, using a user's retain flag
void Mqtt::publish(const std::string & topic, const std::string & payload) {
queue_publish_message(topic, payload, mqtt_retain_);
}
// MQTT Publish, using a user's retain flag - except for char * strings
void Mqtt::publish(const __FlashStringHelper * topic, const char * payload) {
queue_publish_message(uuid::read_flash_string(topic), payload, mqtt_retain_);
}
// MQTT Publish, using a specific retain flag, topic is a flash string
void Mqtt::publish(const __FlashStringHelper * topic, const std::string & payload) {
queue_publish_message(uuid::read_flash_string(topic), payload, mqtt_retain_);
}
void Mqtt::publish(const __FlashStringHelper * topic, const JsonObject & payload) {
publish(uuid::read_flash_string(topic), payload);
}
// publish json doc, only if its not empty
void Mqtt::publish(const std::string & topic, const JsonObject & payload) {
publish_retain(topic, payload, mqtt_retain_);
}
// no payload
void Mqtt::publish(const std::string & topic) {
queue_publish_message(topic, "", false);
}
// MQTT Publish, using a specific retain flag, topic is a flash string, forcing retain flag
void Mqtt::publish_retain(const __FlashStringHelper * topic, const std::string & payload, bool retain) {
queue_publish_message(uuid::read_flash_string(topic), payload, retain);
}
// publish json doc, only if its not empty, using the retain flag
void Mqtt::publish_retain(const std::string & topic, const JsonObject & payload, bool retain) {
if (enabled() && payload.size()) {
std::string payload_text;
serializeJson(payload, payload_text); // convert json to string
queue_publish_message(topic, payload_text, retain);
}
}
void Mqtt::publish_retain(const __FlashStringHelper * topic, const JsonObject & payload, bool retain) {
publish_retain(uuid::read_flash_string(topic), payload, retain);
}
void Mqtt::publish_ha(const __FlashStringHelper * topic, const JsonObject & payload) {
publish_ha(uuid::read_flash_string(topic), payload);
}
// publish a Home Assistant config topic and payload, with retain flag off.
void Mqtt::publish_ha(const std::string & topic, const JsonObject & payload) {
if (!enabled()) {
return;
}
// empty payload will remove the previous config
// publish(topic);
std::string payload_text;
payload_text.reserve(measureJson(payload) + 1);
serializeJson(payload, payload_text); // convert json to string
#if defined(EMSESP_STANDALONE)
LOG_DEBUG(F("Publishing HA topic=%s, payload=%s"), topic.c_str(), payload_text.c_str());
#elif defined(EMSESP_DEBUG)
LOG_DEBUG(F("[debug] Publishing HA topic=%s, payload=%s"), topic.c_str(), payload_text.c_str());
#endif
// queue messages if the MQTT connection is not yet established. to ensure we don't miss messages
queue_publish_message(topic, payload_text, true); // with retain true
}
// take top from queue and perform the publish or subscribe action
// assumes there is an MQTT connection
void Mqtt::process_queue() {
if (mqtt_messages_.empty()) {
return;
}
// fetch first from queue and create the full topic name
auto mqtt_message = mqtt_messages_.front();
auto message = mqtt_message.content_;
char topic[MQTT_TOPIC_MAX_SIZE];
if ((strncmp(message->topic.c_str(), "homeassistant/", 13) == 0)) {
// leave topic as it is
strcpy(topic, message->topic.c_str());
} else {
snprintf_P(topic, MQTT_TOPIC_MAX_SIZE, PSTR("%s/%s"), mqtt_base_.c_str(), message->topic.c_str());
}
// if we're subscribing...
if (message->operation == Operation::SUBSCRIBE) {
LOG_DEBUG(F("Subscribing to topic: %s"), topic);
uint16_t packet_id = mqttClient_->subscribe(topic, mqtt_qos_);
if (!packet_id) {
LOG_DEBUG(F("Error subscribing to %s"), topic);
}
mqtt_messages_.pop_front(); // remove the message from the queue
return;
}
// if this has already been published and we're waiting for an ACK, don't publish again
// it will have a real packet ID
if (mqtt_message.packet_id_ > 0) {
#if defined(EMSESP_DEBUG)
LOG_DEBUG(F("[DEBUG] Waiting for QOS-ACK"));
#endif
return;
}
// else try and publish it
uint16_t packet_id = mqttClient_->publish(topic, mqtt_qos_, message->retain, message->payload.c_str(), message->payload.size(), false, mqtt_message.id_);
LOG_DEBUG(F("Publishing topic %s (#%02d, retain=%d, try#%d, size %d, pid %d)"), topic, mqtt_message.id_, message->retain, mqtt_message.retry_count_ + 1, message->payload.size(), packet_id);
if (packet_id == 0) {
// it failed. if we retried n times, give up. remove from queue
if (mqtt_message.retry_count_ == (MQTT_PUBLISH_MAX_RETRY - 1)) {
LOG_ERROR(F("Failed to publish to %s after %d attempts"), topic, mqtt_message.retry_count_ + 1);
mqtt_publish_fails_++; // increment failure counter
mqtt_messages_.pop_front(); // delete
return;
} else {
// update the record
mqtt_messages_.front().retry_count_++;
LOG_DEBUG(F("Failed to publish to %s. Trying again, #%d"), topic, mqtt_message.retry_count_ + 1);
return; // leave on queue for next time so it gets republished
}
}
// if we have ACK set with QOS 1 or 2, leave on queue and let the ACK process remove it
// but add the packet_id so we can check it later
if (mqtt_qos_ != 0) {
mqtt_messages_.front().packet_id_ = packet_id;
#if defined(EMSESP_DEBUG)
LOG_DEBUG(F("[DEBUG] Setting packetID for ACK to %d"), packet_id);
#endif
return;
}
mqtt_messages_.pop_front(); // remove the message from the queue
}
// HA config for a sensor and binary_sensor entity
// entity must match the key/value pair in the *_data topic
// e.g. homeassistant/sensor/ems-esp32/thermostat_hc1_seltemp/config
// with:
// {"uniq_id":"thermostat_hc1_seltemp","stat_t":"ems-esp32/thermostat_data","name":"Thermostat hc1 Setpoint room temperature",
// "val_tpl":"{{value_json.hc1.seltemp}}","unit_of_meas":"°C","ic":"mdi:temperature-celsius","dev":{"ids":["ems-esp-thermostat"]}}
//
// note: some string copying here into chars, it looks messy but does help with heap fragmentation issues
void Mqtt::publish_mqtt_ha_sensor(uint8_t type, // EMSdevice::DeviceValueType
uint8_t tag, // EMSdevice::DeviceValueTAG
const __FlashStringHelper * name,
const uint8_t device_type, // EMSdevice::DeviceType
const __FlashStringHelper * entity,
const uint8_t uom) { // EMSdevice::DeviceValueUOM (0=NONE)
// ignore if name (fullname) is empty
if (name == nullptr) {
return;
}
DynamicJsonDocument doc(EMSESP_JSON_SIZE_HA_CONFIG);
bool have_tag = !EMSdevice::tag_to_string(tag).empty() && (device_type != EMSdevice::DeviceType::BOILER); // ignore boiler
bool is_nested = (nested_format_ == 1) || (device_type == EMSdevice::DeviceType::BOILER); // boiler never uses nested
// create entity by add the tag if present, seperating with a .
char new_entity[50];
if (have_tag) {
snprintf_P(new_entity, sizeof(new_entity), PSTR("%s.%s"), EMSdevice::tag_to_string(tag).c_str(), uuid::read_flash_string(entity).c_str());
} else {
snprintf_P(new_entity, sizeof(new_entity), PSTR("%s"), uuid::read_flash_string(entity).c_str());
}
// device name
char device_name[50];
strncpy(device_name, EMSdevice::device_type_2_device_name(device_type).c_str(), sizeof(device_name));
// build unique identifier which will be used in the topic
// and replacing all . with _ as not to break HA
std::string uniq(50, '\0');
snprintf_P(&uniq[0], uniq.capacity() + 1, PSTR("%s_%s"), device_name, new_entity);
std::replace(uniq.begin(), uniq.end(), '.', '_');
doc["uniq_id"] = uniq;
doc["~"] = mqtt_base_;
// state topic
char stat_t[MQTT_TOPIC_MAX_SIZE];
snprintf_P(stat_t, sizeof(stat_t), PSTR("~/%s"), tag_to_topic(device_type, tag).c_str());
doc["stat_t"] = stat_t;
// name
char new_name[80];
if (have_tag) {
snprintf_P(new_name, sizeof(new_name), PSTR("%s %s %s"), device_name, EMSdevice::tag_to_string(tag).c_str(), uuid::read_flash_string(name).c_str());
} else {
snprintf_P(new_name, sizeof(new_name), PSTR("%s %s"), device_name, uuid::read_flash_string(name).c_str());
}
new_name[0] = toupper(new_name[0]); // capitalize first letter
doc["name"] = new_name;
// value template
char val_tpl[50];
if (is_nested) {
snprintf_P(val_tpl, sizeof(val_tpl), PSTR("{{value_json.%s}}"), new_entity);
} else {
snprintf_P(val_tpl, sizeof(val_tpl), PSTR("{{value_json.%s}}"), uuid::read_flash_string(entity).c_str());
}
doc["val_tpl"] = val_tpl;
char topic[MQTT_TOPIC_MAX_SIZE];
// look at the device value type
if (type == DeviceValueType::BOOL) {
// binary sensor
snprintf_P(topic, sizeof(topic), PSTR("homeassistant/binary_sensor/%s/%s/config"), mqtt_base_.c_str(), uniq.c_str()); // topic
// how to render boolean. HA only accepts String values
char result[10];
doc[F("payload_on")] = Helpers::render_boolean(result, true);
doc[F("payload_off")] = Helpers::render_boolean(result, false);
} else {
// normal HA sensor, not a boolean one
snprintf_P(topic, sizeof(topic), PSTR("homeassistant/sensor/%s/%s/config"), mqtt_base_.c_str(), uniq.c_str()); // topic
// unit of measure and map the HA icon
if (uom != DeviceValueUOM::NONE && uom != DeviceValueUOM::PUMP) {
doc["unit_of_meas"] = EMSdevice::uom_to_string(uom);
}
switch (uom) {
case DeviceValueUOM::DEGREES:
doc["ic"] = F_(icontemperature);
break;
case DeviceValueUOM::PERCENT:
doc["ic"] = F_(iconpercent);
break;
case DeviceValueUOM::PUMP:
doc["ic"] = F_(iconpump);
break;
case DeviceValueUOM::NONE:
default:
break;
}
}
JsonObject dev = doc.createNestedObject("dev");
JsonArray ids = dev.createNestedArray("ids");
// for System commands we'll use the ID EMS-ESP
if (device_type == EMSdevice::DeviceType::SYSTEM) {
ids.add("ems-esp");
} else {
char ha_device[40];
snprintf_P(ha_device, sizeof(ha_device), PSTR("ems-esp-%s"), device_name);
ids.add(ha_device);
}
publish_ha(topic, doc.as<JsonObject>());
}
// based on the device and tag, create the MQTT topic name (without the basename)
// differs based on whether MQTT nested is enabled
// tag = EMSdevice::DeviceValueTAG
const std::string Mqtt::tag_to_topic(uint8_t device_type, uint8_t tag) {
// the system device is treated differently. The topic is 'heartbeat' and doesn't follow the usual convention
if (device_type == EMSdevice::DeviceType::SYSTEM) {
return EMSdevice::tag_to_mqtt(tag);
}
// if there is a tag add it
if ((EMSdevice::tag_to_mqtt(tag).empty()) || ((nested_format_ == 1) && (device_type != EMSdevice::DeviceType::BOILER))) {
return EMSdevice::device_type_2_device_name(device_type) + "_data";
} else {
return EMSdevice::device_type_2_device_name(device_type) + "_data_" + EMSdevice::tag_to_mqtt(tag);
}
}
} // namespace emsesp
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