Add dependencies for HA support

code/espurna/config/arduino.h

@@ -52,6 +52,7 @@
 //#define DOMOTICZ_SUPPORT       0
 //#define DS18B20_SUPPORT        1
 //#define EMON_SUPPORT           1
+//#define HOMEASSISTANT_SUPPORT  0
 //#define I2C_SUPPORT            1
 //#define INFLUXDB_SUPPORT       0
 //#define MDNS_SUPPORT           0

code/espurna/homeassitant.ino

@@ -8,6 +8,8 @@ Copyright (C) 2017 by Xose Pérez <xose dot perez at gmail dot com>
 
 #if HOMEASSISTANT_SUPPORT
 
+#include <ArduinoJson.h>
+
 void haSend() {
 
     DEBUG_MSG_P(PSTR("[HA] Sending autodiscovery MQTT message\n"));