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31b03c56d838727c23e08dd437d8670490ec8ef4
EMS-ESP32/src/mqtt.cpp
proddy 31b03c56d8 fix HA binary sensor
2021-01-10 15:47:48 +01:00

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/*
* EMS-ESP - https://github.com/proddy/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::hostname_;
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::ha_climate_format_;
bool Mqtt::ha_enabled_;
// static emsesp::queue<Mqtt::QueuedMqttMessage> mqtt_messages_ = emsesp::queue<Mqtt::QueuedMqttMessage>(MAX_MQTT_MESSAGES);
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
if (cb) {
mqtt_subfunction.mqtt_subfunction_ = cb;
}
return; // it exists, exit
}
}
}
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 both the original topic and the fully-qualified one
mqtt_subfunctions_.emplace_back(device_type, std::move(topic), std::move(message->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) {
std::string cmd_topic = EMSdevice::device_type_2_device_name(device_type);
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
}
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());
}
// 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_);
}
}
// Main MQTT loop - sends out top item on publish queue
void Mqtt::loop() {
// exit if MQTT is not enabled or if there is no WIFI
if (!connected()) {
return;
}
uint32_t currentMillis = uuid::get_uptime();
// create publish messages for each of the EMS device values, adding to queue
if (publish_time_boiler_ && (currentMillis - last_publish_boiler_ > publish_time_boiler_)) {
last_publish_boiler_ = currentMillis;
EMSESP::publish_device_values(EMSdevice::DeviceType::BOILER);
}
if (publish_time_thermostat_ && (currentMillis - last_publish_thermostat_ > publish_time_thermostat_)) {
last_publish_thermostat_ = currentMillis;
EMSESP::publish_device_values(EMSdevice::DeviceType::THERMOSTAT);
}
if (publish_time_solar_ && (currentMillis - last_publish_solar_ > publish_time_solar_)) {
last_publish_solar_ = currentMillis;
EMSESP::publish_device_values(EMSdevice::DeviceType::SOLAR);
}
if (publish_time_mixer_ && (currentMillis - last_publish_mixer_ > publish_time_mixer_)) {
last_publish_mixer_ = currentMillis;
EMSESP::publish_device_values(EMSdevice::DeviceType::MIXER);
}
if (currentMillis - last_publish_sensor_ > publish_time_sensor_) {
last_publish_sensor_ = currentMillis;
EMSESP::publish_sensor_values(publish_time_sensor_ != 0);
}
// 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();
}
}
// 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"), mqtt_subfunction.full_topic_.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_;
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_, content->topic.c_str(), content->payload.c_str());
} else {
shell.printfln(F(" [%02d] (Pub) topic=%s payload=%s (pid %d)"), message.id_, content->topic.c_str(), content->payload.c_str(), message.packet_id_);
}
} else {
shell.printfln(F(" [%02d] (Pub) topic=%s payload=%s (pid %d, retry #%d)"), message.id_, content->topic.c_str(), content->payload.c_str(), message.packet_id_, message.retry_count_);
}
} else {
// Subscribe messages
shell.printfln(F(" [%02d] (Sub) topic=%s"), message.id_, content->topic.c_str());
}
}
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 * topic, const char * payload, size_t len) {
if (len == 0) {
return; // ignore empty payloads
}
// 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.full_topic_.c_str()) == 0) {
if (mf.mqtt_subfunction_) {
// matching function, call it. If it returns true keep quit
if ((mf.mqtt_subfunction_)(message)) {
return; // function executed successfully
}
}
// empty function. It's a command then. 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()) {
cmd_known = Command::call(mf.device_type_, command, "", n);
}
if (!cmd_known) {
LOG_ERROR(F("No matching cmd (%s), invalid data or command failed"), 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 "), 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()) {
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) {
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
}
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::start() {
mqttClient_ = EMSESP::esp8266React.getMqttClient();
// get the hostname, which we'll use to prefix to all topics
EMSESP::esp8266React.getWiFiSettingsService()->read([&](WiFiSettings & wifiSettings) { hostname_ = wifiSettings.hostname.c_str(); });
// fetch MQTT settings, to see if MQTT is enabled
EMSESP::esp8266React.getMqttSettingsService()->read([&](MqttSettings & mqttSettings) {
mqtt_enabled_ = mqttSettings.enabled;
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) {
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"));
}
});
// create will_topic with the hostname prefixed. It has to be static because asyncmqttclient destroys the reference
static char will_topic[MQTT_TOPIC_MAX_SIZE];
strlcpy(will_topic, hostname_.c_str(), MQTT_TOPIC_MAX_SIZE);
strlcat(will_topic, "/", MQTT_TOPIC_MAX_SIZE);
strlcat(will_topic, "status", MQTT_TOPIC_MAX_SIZE);
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(10);
}
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_) {
return;
}
LOG_INFO(F("MQTT connected"));
connecting_ = true;
connectcount_++;
// fetch MQTT settings
EMSESP::esp8266React.getMqttSettingsService()->read([&](MqttSettings & mqttSettings) {
publish_time_boiler_ = mqttSettings.publish_time_boiler * 1000; // convert to milliseconds
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;
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;
});
// first time to connect
if (connectcount_ == 1) {
// send info topic appended with the version information as JSON
StaticJsonDocument<EMSESP_JSON_SIZE_SMALL> doc;
doc["event"] = FJSON("start");
doc["version"] = EMSESP_APP_VERSION;
#ifndef EMSESP_STANDALONE
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
} else {
// 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
}
// 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["~"] = System::hostname(); // default ems-esp
// doc["avty_t"] = FJSON("~/status"); // commented out, as it causes errors in HA sometimes
doc["json_attr_t"] = FJSON("~/heartbeat");
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-system");
char topic[100];
snprintf_P(topic, sizeof(topic), PSTR("homeassistant/sensor/%s/system/config"), System::hostname().c_str());
Mqtt::publish_ha(topic, doc.as<JsonObject>()); // publish the config payload with retain flag
// create the sensors
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("Wifi strength"), EMSdevice::DeviceType::SYSTEM, F("rssi"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("Uptime"), EMSdevice::DeviceType::SYSTEM, F("uptime"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("Uptime (sec)"), EMSdevice::DeviceType::SYSTEM, F("uptime_sec"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("Free heap memory"), EMSdevice::DeviceType::SYSTEM, F("freemem"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Failed MQTT publishes"), EMSdevice::DeviceType::SYSTEM, F("mqttfails"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Rx Sent"), EMSdevice::DeviceType::SYSTEM, F("rxsent"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Rx Fails"), EMSdevice::DeviceType::SYSTEM, F("rxfails"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Tx Reads"), EMSdevice::DeviceType::SYSTEM, F("txread"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Tx Writes"), EMSdevice::DeviceType::SYSTEM, F("txwrite"), DeviceValueUOM::NONE);
publish_mqtt_ha_sensor(DeviceValueType::INT, DeviceValueTAG::TAG_NONE, F("# Tx Fails"), EMSdevice::DeviceType::SYSTEM, F("txfails"), DeviceValueUOM::NONE);
}
// add sub or pub task to the queue.
// a fully-qualified topic is created by prefixing the hostname, 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 hostname, unless its for HA
std::shared_ptr<MqttMessage> message;
if ((strncmp(topic.c_str(), "homeassistant/", 13) == 0)) {
// leave topic as it is
message = std::make_shared<MqttMessage>(operation, topic, payload, retain);
} else {
// prefix the hostname
std::string full_topic(100, '\0');
snprintf_P(&full_topic[0], full_topic.capacity() + 1, PSTR("%s/%s"), hostname_.c_str(), topic.c_str());
message = std::make_shared<MqttMessage>(operation, full_topic, payload, retain);
}
// 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));
/*
QueuedMqttMessage qmm;
qmm.content_ = std::move(message);
qmm.retry_count_ = 0;
qmm.packet_id_ = 0;
qmm.id_ = mqtt_message_id_++;
mqtt_messages_.push_back(qmm);
*/
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() || !connecting_) {
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.
// for ESP32 its added to the queue, for ESP8266 is sent immediatelty
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
bool queued = !connected();
if (queued) {
queue_publish_message(topic, payload_text, true); // with retain true
return;
}
// send immediately and then wait a while
if (!mqttClient_->publish(topic.c_str(), 0, true, payload_text.c_str())) {
LOG_ERROR(F("Failed to publish topic %s"), topic.c_str());
mqtt_publish_fails_++; // increment failure counter
}
delay(MQTT_HA_PUBLISH_DELAY); // enough time to send the short message out
}
// 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_;
// if we're subscribing...
if (message->operation == Operation::SUBSCRIBE) {
LOG_DEBUG(F("Subscribing to topic: %s"), message->topic.c_str());
uint16_t packet_id = mqttClient_->subscribe(message->topic.c_str(), mqtt_qos_);
if (!packet_id) {
LOG_DEBUG(F("Error subscribing to %s"), message->topic.c_str());
}
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) {
return;
}
// else try and publish it
uint16_t packet_id = mqttClient_->publish(message->topic.c_str(), 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)"), message->topic.c_str(), 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"), message->topic.c_str(), mqtt_message.retry_count_ + 1);
mqtt_publish_fails_++; // increment failure counter
mqtt_messages_.pop_front(); // delete
return;
} else {
// update the record
// mqtt_messages_.front_p()->retry_count_++;
mqtt_messages_.front().retry_count_++;
LOG_DEBUG(F("Failed to publish to %s. Trying again, #%d"), message->topic.c_str(), 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_p()->packet_id_ = packet_id;
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,
const __FlashStringHelper * name,
const uint8_t device_type, // EMSdevice::DeviceType
const __FlashStringHelper * entity,
const uint8_t uom) {
// ignore if name (fullname) is empty
if (name == nullptr) {
return;
}
DynamicJsonDocument doc(EMSESP_JSON_SIZE_HA_CONFIG);
// special case for boiler - don't use the prefix
bool have_prefix = ((tag != DeviceValueTAG::TAG_NONE) && (device_type != EMSdevice::DeviceType::BOILER));
// create entity by inserting any given prefix
// we ignore the tag if BOILER
char new_entity[50];
if (have_prefix) {
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;
// state topic
// if its a boiler we use the tag
char stat_t[MQTT_TOPIC_MAX_SIZE];
if (device_type == EMSdevice::DeviceType::BOILER) {
snprintf_P(stat_t, sizeof(stat_t), PSTR("%s/%s"), hostname_.c_str(), EMSdevice::tag_to_string(tag).c_str());
} else if (device_type == EMSdevice::DeviceType::SYSTEM) {
snprintf_P(stat_t, sizeof(stat_t), PSTR("%s/heartbeat"), hostname_.c_str());
} else {
snprintf_P(stat_t, sizeof(stat_t), PSTR("%s/%s_data"), hostname_.c_str(), device_name);
}
doc["stat_t"] = stat_t;
// name
char new_name[50];
if (have_prefix) {
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];
snprintf_P(val_tpl, sizeof(val_tpl), PSTR("{{value_json.%s}}"), new_entity);
doc["val_tpl"] = val_tpl;
char topic[MQTT_TOPIC_MAX_SIZE]; // reserved for topic
// look at the device value type
if (type == DeviceValueType::BOOL) {
// binary sensor
snprintf_P(topic, sizeof(topic), PSTR("homeassistant/binary_sensor/%s/%s/config"), System::hostname().c_str(), uniq.c_str()); // topic
// how to render boolean
EMSESP::webSettingsService.read([&](WebSettings & settings) {
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"), System::hostname().c_str(), uniq.c_str()); // topic
// unit of measure and map the HA icon
if (uom != DeviceValueUOM::NONE) {
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::NONE:
default:
break;
}
}
JsonObject dev = doc.createNestedObject("dev");
JsonArray ids = dev.createNestedArray("ids");
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>());
}
} // namespace emsesp
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