/* Usage: 
   ESP will subscribe to mqtt topic "ssid/macAddress" waiting for tri State codes to be sent.
   Where 
     - "ssid" is the ssid of the wifi, the esp will connect and
     - "macAddress" is the hardware address of the esp itself

   Upon mqtt connect the device will publish an "online" message to the same topic.

   To send commands to the device use mosquitto_pub e.g.
   mosquitto_pub -t myWifi/18fe349bde2c -m '0FF00FF0FFF0'
*/

#include <ESP8266WiFi.h>
#include <PubSubClient.h>
#include <RCSwitch.h>


// Update these with values suitable for your network.

const char* ssid        = "myWifi";
const char* password    = "s3cr3t";
const char* mqtt_server = "mqtt.is.sexy";
const int   mqtt_port   = 1883;

WiFiClient   espClient;
PubSubClient mqttClient(espClient);
RCSwitch     rcSwitch = RCSwitch();

char mac[13];
char mqttTopic[65];

void setup() {
  Serial.begin(115200);
  
  setup_wifi();
  setup_mqtt();
  setup_rcSwitch();
}

void setup_rcSwitch() {
  rcSwitch.enableTransmit(2);
}

void setup_mqtt() {
  mqttClient.setServer(mqtt_server, mqtt_port);
  mqttClient.setCallback(mqtt_recv);
  snprintf (mqttTopic, 64, "%s/%s", ssid, mac);
}

void setup_wifi() {
  Serial.println();
  uint8_t mac_t[6];
  WiFi.macAddress(mac_t);
  sprintf(mac,"%02x%02x%02x%02x%02x%02x",mac_t[0],mac_t[1],mac_t[2],mac_t[3],mac_t[4],mac_t[5]);
  Serial.println(sprintf("Client MAC Address: %s",mac));
  
  Serial.print("Connecting to ");
  Serial.println(ssid);
  
  WiFi.begin(ssid, password);

  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  Serial.println("WiFi connected");
  Serial.print("  IP address: ");
  Serial.println(WiFi.localIP());
}

void mqtt_recv(char* topic, byte* payload, unsigned int length) {
/*
  Serial.print(topic);
  Serial.print(": ");
  for (int i = 0; i < length; i++) {
    Serial.print((char)payload[i]);
  }
  Serial.println();
*/
  char *cmd = (char*)malloc(length + 2);
  snprintf(cmd,length + 1,"%s",(char*)payload);
  mqttClient.publish("esp8266/debug",cmd);
  rcSwitch.sendTriState((char*)cmd);
  
  delay(1000);
}

void mqtt_reconnect() {
  while (!mqttClient.connected()) {
    Serial.print("Attempting MQTT connection...");
    if (mqttClient.connect("ESP8266Client")) {
      Serial.println("connected");
      mqttClient.publish(mqttTopic, "reconnected");
      mqttClient.subscribe(mqttTopic);
    } else {
      Serial.print("failed, rc=");
      Serial.print(mqttClient.state());
      Serial.println();
      delay(5000);
    }
  }
  if(mqttClient.loop()) {
    delay(200);
  }
}
void loop() {
  mqtt_reconnect();
}