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// Include the required headers
#include <ESP8266WiFi.h>
#include "MqttConnection.h"
#include "DataStructures.h"
#include <WiFiClientSecure.h>
#include <MQTT.h>
// create an instance of WifiClientSecure, and call it espClient
WiFiClientSecure espClient;
// create an instance of the MQTTClient called client, provide it with a buffer of 4096 bytes to handle incoming messages
MQTTClient client(4096);
void mqtt_connection::ensure_mqtt_connected(void(*callback)(String&, String&))
{
if (client.connected()) {
return;
}
// set up an SSL fingerprint so that the secure client can verify the SSL cert of the MQTT broker
espClient.setFingerprint(cfg_->mqtt.certificate);
// tell the client the address of our broker, and provide it a wifi client (our secure client) to connect over
client.begin(cfg_->mqtt.server, cfg_->mqtt.port, espClient);
// pass a callback function to the client - which will call it for each message that's delivered over MQTT
client.onMessage(callback);
// receiving loop
while (!client.connected())
{
Serial.print(F("Attempting MQTT connection..."));
if (client.connect("tshirtHardware", cfg_->mqtt.user, cfg_->mqtt.password))
{
Serial.println(F("Connected."));
client.subscribe(cfg_->mqtt.subscription);
}
else
{
Serial.println(F("Failed to connect to MQTT - Trying again in 5 seconds..."));
delay(5000);
}
}
}
void mqtt_connection::process_messages()
{
client.loop();
}
int mqtt_connection::publish(String message)
{
return client.publish(cfg_->mqtt.subscription, message);
}
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