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Re-add CustomMQTTDevice class (#640)

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* Re-add CustomMQTTDevice class

Fixes https://github.com/esphome/issues/issues/427

* Fix
This commit is contained in:
Otto Winter 2019-06-14 12:53:38 +02:00
parent 10cc0b1d5b
commit b8aa84002a
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30
esphome/components/mqtt/custom_mqtt_device.cpp Normal file
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#include "custom_mqtt_device.h"
#include "esphome/core/log.h"
namespace esphome {
namespace mqtt {
static const char *TAG = "mqtt.custom";
bool CustomMQTTDevice::publish(const std::string &topic, const std::string &payload, uint8_t qos, bool retain) {
return global_mqtt_client->publish(topic, payload, qos, retain);
}
bool CustomMQTTDevice::publish(const std::string &topic, float value, int8_t number_decimals) {
auto str = value_accuracy_to_string(value, number_decimals);
return this->publish(topic, str);
}
bool CustomMQTTDevice::publish(const std::string &topic, int value) {
char buffer[24];
sprintf(buffer, "%d", value);
return this->publish(topic, buffer);
}
bool CustomMQTTDevice::publish_json(const std::string &topic, const json::json_build_t &f, uint8_t qos, bool retain) {
return global_mqtt_client->publish_json(topic, f, qos, retain);
}
bool CustomMQTTDevice::publish_json(const std::string &topic, const json::json_build_t &f) {
return this->publish_json(topic, f, 0, false);
}
bool CustomMQTTDevice::is_connected() { return global_mqtt_client != nullptr && global_mqtt_client->is_connected(); }
} // namespace mqtt
} // namespace esphome

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