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Re-add CustomMQTTDevice class (#640)
* Re-add CustomMQTTDevice class Fixes https://github.com/esphome/issues/issues/427 * Fix
This commit is contained in:
Otto Winter
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2 changed files with 247 additions and 0 deletions
30
esphome/components/mqtt/custom_mqtt_device.cpp
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30
esphome/components/mqtt/custom_mqtt_device.cpp
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#include "custom_mqtt_device.h"
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#include "esphome/core/log.h"
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namespace esphome {
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namespace mqtt {
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static const char *TAG = "mqtt.custom";
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bool CustomMQTTDevice::publish(const std::string &topic, const std::string &payload, uint8_t qos, bool retain) {
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return global_mqtt_client->publish(topic, payload, qos, retain);
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}
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bool CustomMQTTDevice::publish(const std::string &topic, float value, int8_t number_decimals) {
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auto str = value_accuracy_to_string(value, number_decimals);
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return this->publish(topic, str);
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}
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bool CustomMQTTDevice::publish(const std::string &topic, int value) {
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char buffer[24];
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sprintf(buffer, "%d", value);
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return this->publish(topic, buffer);
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}
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bool CustomMQTTDevice::publish_json(const std::string &topic, const json::json_build_t &f, uint8_t qos, bool retain) {
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return global_mqtt_client->publish_json(topic, f, qos, retain);
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}
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bool CustomMQTTDevice::publish_json(const std::string &topic, const json::json_build_t &f) {
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return this->publish_json(topic, f, 0, false);
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}
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bool CustomMQTTDevice::is_connected() { return global_mqtt_client != nullptr && global_mqtt_client->is_connected(); }
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} // namespace mqtt
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} // namespace esphome
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217
esphome/components/mqtt/custom_mqtt_device.h
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217
esphome/components/mqtt/custom_mqtt_device.h
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#pragma once
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#include "esphome/core/component.h"
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#include "mqtt_client.h"
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namespace esphome {
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namespace mqtt {
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/** This class is a helper class for custom components that communicate using
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* MQTT. It has 5 helper functions that you can use (square brackets indicate optional):
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*
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* - `subscribe(topic, function_pointer, [qos])`
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* - `subscribe_json(topic, function_pointer, [qos])`
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* - `publish(topic, payload, [qos], [retain])`
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* - `publish_json(topic, payload_builder, [qos], [retain])`
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* - `is_connected()`
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*/
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class CustomMQTTDevice {
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public:
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/** Subscribe to an MQTT topic with the given Quality of Service.
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*
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* Example:
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*
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* ```cpp
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* class MyCustomMQTTDevice : public Component, public mqtt:CustomMQTTDevice {
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* public:
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* void setup() override {
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* subscribe("the/topic", &MyCustomMQTTDevice::on_message);
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* pinMode(5, OUTPUT);
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* }
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*
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* // topic and payload parameters can be removed if not needed
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* // e.g: void on_message() {
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*
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* void on_message(const std::string &topic, const std::string &payload) {
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* // do something with topic and payload
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* if (payload == "ON") {
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* digitalWrite(5, HIGH);
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* } else {
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* digitalWrite(5, LOW);
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* }
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* }
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* };
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* ```
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*
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* @tparam T A C++ template argument for determining the type of the callback.
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* @param topic The topic to subscribe to. Re-subscription on re-connects is automatically handled.
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* @param callback The callback (must be a class member) to subscribe with.
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* @param qos The Quality of Service to subscribe with. Defaults to 0.
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*/
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template<typename T>
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void subscribe(const std::string &topic, void (T::*callback)(const std::string &, const std::string &),
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uint8_t qos = 0);
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template<typename T>
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void subscribe(const std::string &topic, void (T::*callback)(const std::string &), uint8_t qos = 0);
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template<typename T> void subscribe(const std::string &topic, void (T::*callback)(), uint8_t qos = 0);
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/** Subscribe to an MQTT topic and call the callback if the payload can be decoded
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* as JSON with the given Quality of Service.
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*
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* Example:
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*
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* ```cpp
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* class MyCustomMQTTDevice : public Component, public mqtt:CustomMQTTDevice {
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* public:
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* void setup() override {
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* subscribe_json("the/topic", &MyCustomMQTTDevice::on_json_message);
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* pinMode(5, OUTPUT);
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* }
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*
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* // topic parameter can be remove if not needed:
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* // e.g.: void on_json_message(JsonObject &payload) {
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*
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* void on_json_message(const std::string &topic, JsonObject &payload) {
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* // do something with topic and payload
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* if (payload["number"] == 1) {
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* digitalWrite(5, HIGH);
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* } else {
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* digitalWrite(5, LOW);
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* }
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* }
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* };
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* ```
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*
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* @tparam T A C++ template argument for determining the type of the callback.
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* @param topic The topic to subscribe to. Re-subscription on re-connects is automatically handled.
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* @param callback The callback (must be a class member) to subscribe with.
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* @param qos The Quality of Service to subscribe with. Defaults to 0.
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*/
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template<typename T>
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void subscribe_json(const std::string &topic, void (T::*callback)(const std::string &, JsonObject &),
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uint8_t qos = 0);
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template<typename T>
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void subscribe_json(const std::string &topic, void (T::*callback)(JsonObject &), uint8_t qos = 0);
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/** Publish an MQTT message with the given payload and QoS and retain settings.
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*
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* Example:
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*
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* ```cpp
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* void in_some_method() {
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* publish("the/topic", "The Payload", 0, true);
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* }
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* ```
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*
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* @param topic The topic to publish to.
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* @param payload The payload to publish.
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* @param qos The Quality of Service to publish with. Defaults to 0
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* @param retain Whether to retain the message. Defaults to false.
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*/
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bool publish(const std::string &topic, const std::string &payload, uint8_t qos = 0, bool retain = false);
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/** Publish an MQTT message with the given floating point number and number of decimals.
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*
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* Example:
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*
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* ```cpp
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* void in_some_method() {
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* publish("the/topic", 1.0);
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* // with two digits after the decimal point
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* publish("the/topic", 1.0, 2);
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* }
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* ```
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*
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* @param topic The topic to publish to.
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* @param payload The payload to publish.
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* @param number_decimals The number of digits after the decimal point to round to, defaults to 3 digits.
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*/
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bool publish(const std::string &topic, float value, int8_t number_decimals = 3);
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/** Publish an MQTT message with the given integer as payload.
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*
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* Example:
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*
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* ```cpp
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* void in_some_method() {
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* publish("the/topic", 42);
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* }
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* ```
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*
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* @param topic The topic to publish to.
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* @param payload The payload to publish.
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*/
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bool publish(const std::string &topic, int value);
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/** Publish a JSON-encoded MQTT message with the given Quality of Service and retain settings.
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*
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* Example:
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*
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* ```cpp
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* void in_some_method() {
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* publish("the/topic", [=](JsonObject &root) {
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* root["the_key"] = "Hello World!";
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* }, 0, false);
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* }
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* ```
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*
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* @param topic The topic to publish to.
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* @param payload The payload to publish.
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* @param qos The Quality of Service to publish with.
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* @param retain Whether to retain the message.
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*/
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bool publish_json(const std::string &topic, const json::json_build_t &f, uint8_t qos, bool retain);
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/** Publish a JSON-encoded MQTT message.
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*
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* Example:
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*
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* ```cpp
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* void in_some_method() {
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* publish("the/topic", [=](JsonObject &root) {
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* root["the_key"] = "Hello World!";
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* });
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* }
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* ```
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*
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* @param topic The topic to publish to.
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* @param payload The payload to publish.
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*/
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bool publish_json(const std::string &topic, const json::json_build_t &f);
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/// Check whether the MQTT client is currently connected and messages can be published.
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bool is_connected();
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};
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template<typename T>
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void CustomMQTTDevice::subscribe(const std::string &topic,
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void (T::*callback)(const std::string &, const std::string &), uint8_t qos) {
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auto f = std::bind(callback, (T *) this, std::placeholders::_1, std::placeholders::_2);
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global_mqtt_client->subscribe(topic, f, qos);
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}
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template<typename T>
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void CustomMQTTDevice::subscribe(const std::string &topic, void (T::*callback)(const std::string &), uint8_t qos) {
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auto f = std::bind(callback, (T *) this, std::placeholders::_2);
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global_mqtt_client->subscribe(topic, f, qos);
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}
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template<typename T> void CustomMQTTDevice::subscribe(const std::string &topic, void (T::*callback)(), uint8_t qos) {
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auto f = std::bind(callback, (T *) this);
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global_mqtt_client->subscribe(topic, f, qos);
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}
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template<typename T>
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void CustomMQTTDevice::subscribe_json(const std::string &topic, void (T::*callback)(const std::string &, JsonObject &),
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uint8_t qos) {
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auto f = std::bind(callback, (T *) this, std::placeholders::_1, std::placeholders::_2);
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global_mqtt_client->subscribe_json(topic, f, qos);
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}
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template<typename T>
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void CustomMQTTDevice::subscribe_json(const std::string &topic, void (T::*callback)(JsonObject &), uint8_t qos) {
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auto f = std::bind(callback, (T *) this, std::placeholders::_2);
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global_mqtt_client->subscribe_json(topic, f, qos);
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}
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} // namespace mqtt
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} // namespace esphome
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