Finally add support for RGBW lights, per corbanmailloux#7.

README.md

@@ -4,7 +4,7 @@ This project adds an easy way to create DIY lighting for [Home Assistant](https:
 
 I was frustrated that the built-in MQTT light didn't support transitions (fading between colors/brightnesses), and that it uses multiple separate calls to set the different values (state (on/off), brightness, color), so I decided to make my own version. As of version 0.26, the [MQTT JSON light platform](https://home-assistant.io/components/light.mqtt_json/) has been merged into Home Assistant.
 
-By sending a JSON payload (in an MQTT message), Home Assistant can include whichever fields are necessary, reducing the round trips from 3 to 1. For example, this is a sample payload including all of the fields:
+By sending a JSON payload (in an MQTT message), Home Assistant can include whichever fields are necessary, reducing the round trips from 3 to 1. For example, this is a sample payload including most of the fields:
 ```json
 {
   "state": "ON",
@@ -23,16 +23,40 @@ By sending a JSON payload (in an MQTT message), Home Assistant can include which
 To set this system up, you need to configure the [MQTT JSON light](https://home-assistant.io/components/light.mqtt_json/) component in Home Assistant and set up a light to control. This guide assumes that you already have Home Assistant set up and running. If not, see the installation guides [here](https://home-assistant.io/getting-started/).
 
 ### The Home Assistant Side
-1. In your `configuration.yaml`, add the following:
+1. In your `configuration.yaml`, add the following, depending on the supported fatures of the light:
 
     ```yaml
+    # Only one color:
     light:
-      + platform: mqtt_json
+      - platform: mqtt_json
+        name: mqtt_json_light_1
+        state_topic: "home/rgb1"
+        command_topic: "home/rgb1/set"
+        brightness: true
+        optimistic: false
+        qos: 0
+
+    # OR: RGB:
+    light:
+      - platform: mqtt_json
+        name: mqtt_json_light_1
+        state_topic: "home/rgb1"
+        command_topic: "home/rgb1/set"
+        brightness: true
+        rgb: true
+        optimistic: false
+        qos: 0
+
+    # OR: RGBW
+    # RGB
+    light:
+      - platform: mqtt_json
         name: mqtt_json_light_1
         state_topic: "home/rgb1"
         command_topic: "home/rgb1/set"
         brightness: true
         rgb: true
+        white_value: true
         optimistic: false
         qos: 0
     ```
@@ -43,7 +67,7 @@ To set this system up, you need to configure the [MQTT JSON light](https://home-
 I'm using ESP8266-01 microcontrollers for my lights because they are so cheap and small. The downside of the size and price is that programming them can be a bit of a hassle. There are many sites that go into detail, so I won't do it here. You'll need an ESP set up to work with the Arduino IDE. See the readme [here](https://github.com/esp8266/Arduino) for instructions.
 
 1. Using the Library Manager in the Arduino IDE, install [ArduinoJSON](https://github.com/bblanchon/ArduinoJson/) and [PubSubClient](http://pubsubclient.knolleary.net/). You can find the Library Manager in the "Sketch" menu under "Include Library" -> "Manage Libraries..."
-2. Open the appropriate folder for your lights. For an RGB light, use `mqtt_esp8266_rgb`. For a light that only supports brightness, use `mqtt_esp8266_brightness`.
+2. Open the appropriate folder for your lights. For an RGB light, use `mqtt_esp8266_rgb`. For a light that only supports brightness, use `mqtt_esp8266_brightness`, and for an RGBW light, use `mqtt_esp8266_rgbw`.
 3. Update the `config-sample.h` file with your settings for pin numbers, WiFi settings, and MQTT settings.
 4. Ensure that the `CONFIG_MQTT_CLIENT_ID` setting is a unique value for your network.
 5. Set `CONFIG_MQTT_TOPIC_STATE` and `CONFIG_MQTT_TOPIC_SET` to match the values you put in your `configuration.yaml`.

mqtt_esp8266_brightness/mqtt_esp8266_brightness.ino

@@ -6,7 +6,7 @@
  * See https://github.com/corbanmailloux/esp-mqtt-rgb-led
  */
 
-// Set configuration options for pings, WiFi, and MQTT in the following file:
+// Set configuration options for pins, WiFi, and MQTT in the following file:
 #include "config.h"
 
 // https://github.com/bblanchon/ArduinoJson
@@ -18,7 +18,7 @@
 #include <PubSubClient.h>
 
 const int redPin = CONFIG_PIN_LIGHT;
-const int txPin = 1; // On-board blue LED
+const int txPin = BUILTIN_LED; // On-board blue LED
 // const int greenPin = 2;
 // const int bluePin = 3;
 

mqtt_esp8266_rgbw/config-sample.h

@@ -0,0 +1,30 @@
+/*
+ * This is a sample configuration file for the "mqtt_esp8266_rgbw" light.
+ *
+ * Change the settings below and save the file as "config.h"
+ * You can then upload the code using the Arduino IDE.
+ */
+
+// Pins
+#define CONFIG_PIN_RED 0
+#define CONFIG_PIN_GREEN 2
+#define CONFIG_PIN_BLUE 3
+#define CONFIG_PIN_WHITE 4
+
+// WiFi
+#define CONFIG_WIFI_SSID "{WIFI-SSID}"
+#define CONFIG_WIFI_PASS "{WIFI-PASSWORD}"
+
+// MQTT
+#define CONFIG_MQTT_HOST "{MQTT-SERVER}"
+#define CONFIG_MQTT_USER "{MQTT-USERNAME}"
+#define CONFIG_MQTT_PASS "{MQTT-PASSWORD}"
+
+#define CONFIG_MQTT_CLIENT_ID "ESPRGBWLED" // Must be unique on the MQTT network
+
+// MQTT Topics
+#define CONFIG_MQTT_TOPIC_STATE "home/rgbw1"
+#define CONFIG_MQTT_TOPIC_SET "home/rgbw1/set"
+
+#define CONFIG_MQTT_PAYLOAD_ON "ON"
+#define CONFIG_MQTT_PAYLOAD_OFF "OFF"