Added Sonoff 4CH address

MQTT-Features.md

@@ -1,18 +1,18 @@
 Sonoff responds to the following MQTT commands using MQTT Topic for ```cmnd/sonoff/<command>``` and MQTT Message/Payload for ```<parameter>```:
 
-- the relay can be controlled with ```cmnd/sonoff/power on```, ```cmnd/sonoff/power off``` or ```cmnd/sonoff/power toggle```. Sonoff will send a MQTT status message like ```stat/sonoff/POWER ON```. The same function can be initiated with ```cmnd/sonoff/light on```.
+- The relay can be controlled with ```cmnd/sonoff/power on```, ```cmnd/sonoff/power off``` or ```cmnd/sonoff/power toggle```. Sonoff will send a MQTT status message like ```stat/sonoff/POWER ON```. The same function can be initiated with ```cmnd/sonoff/light on```.
 
 - The power state message can be sent with the retain flag set. Enable this with ```cmnd/sonoff/PowerRetain on```.
 
-- For sonoff dual the relays need to be addressed with ```cmnd/sonoff/power1 toggle``` and ```cmnd/sonoff/power2 toggle```.
+- For sonoff dual or 4CH the relays need to be addressed with ```cmnd/sonoff/power{n}```, where {n} is the relay number from 1 to 2(dual) or from 1 to 4(4CH).
 
-- the MQTT topic can be changed with ```cmnd/sonoff/topic sonoff1``` which reboots sonoff and makes it available for MQTT commands like ```cmnd/sonoff1/power on```.
+- The MQTT topic can be changed with ```cmnd/sonoff/topic sonoff1``` which reboots sonoff and makes it available for MQTT commands like ```cmnd/sonoff1/power on```.
 
-- the OTA firmware location can be made known to sonoff with ```cmnd/sonoff/otaurl http://domus1:80/api/sonoff/sonoff.ino.bin``` where domus1 is your webserver hosting the firmware. Reset to default with ```cmnd/sonoff/otaurl 1```.
+- The OTA firmware location can be made known to sonoff with ```cmnd/sonoff/otaurl http://domus1:80/api/sonoff/sonoff.ino.bin``` where domus1 is your webserver hosting the firmware. Reset to default with ```cmnd/sonoff/otaurl 1```.
 
-- upgrade OTA firmware with ```cmnd/sonoff/upgrade 1```.
+- Upgrade OTA firmware with ```cmnd/sonoff/upgrade 1```.
 
-- show all status information with ```cmnd/sonoff/status 0```.
+- Show all status information with ```cmnd/sonoff/status 0```.
 
 - The button can send a MQTT message to the broker that in turn will switch the relay. To configure this you need to perform ```cmnd/sonoff/ButtonTopic sonoff``` where sonoff equals to Topic. The message can also be provided with the retain flag by ```cmnd/sonoff/ButtonRetain on```.