Home Esp8266/Wmos-D1/Nodemcu-Code buy esp8266 board by yawot.com
1.your wifi &hotspot ssid & pass write on arduino code file.
2.Creat thingspeak account.
3.download & upload esp8266 code into your board.
4.after upload open arduino serial page and press reset button when connect it will show to serial page .
5.write thingspeak write key on my webpage to on off devices anywhere in the world.
Control Your Devices Anywhere In The World Using ESP8266, Matlab Thingspeak


toggle on off 10 sec of delay due Thingspeak limitation for without licence user.if you buy licences then no delay in on off