rshell rsync --mirror --verbose ./ /flash- http://m2msupport.net/m2msupport/tutorial-for-simcom-m2m-modules/
- https://arduino.stackexchange.com/questions/23878/what-is-the-proper-way-to-send-data-through-http-using-sim908?utm_medium=organic&utm_source=google_rich_qa&utm_campaign=google_rich_qa&newreg=e3fa216955c543bdb6b638d5fda21c48
- SIM800 TCP https://cdn-shop.adafruit.com/product-files/2637/SIM800+Series_TCPIP_Application+Note_V1.01.pdf