Hi!Here are a copy: http://zybernic.se/~dragon/STC15.pdf Note, its 26 Mb file.Sincerley!
An English translation of the datasheet can be downloaded from their website:STC15-English.pdf
So where's the STC15 in there? o_o
DrAzzy,You can see the bottom six pins of the package under the 8266 antenna...TonyM:Are you trying to toggle the relay through the ESP8266 via wireless? or have you removed the ESP board and you're just driving the relay from the 15F104W? It't not all clear to me what you're trying to do. If you're trying to toggle the relay over an IP connection, you'll need to know the message format to send to the ESP8266 in order to toggle the relay. That information should be available from the module manufacturer. Please explain what you're attempting to do.