Also don't forget it older brother ESP8266. If you just need something simple (and not BT), its even cheaper and does the job. They are both supported in Ardu

Also don't forget it older brother ESP8266. If you just need something simple (and not BT), its even cheaper and does the job. They are both supported in Arduino IDE, my personal preference is platform IO though. IFTTT changed their terms recently so not sure If I would continue relying on them