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Smart Home Automation with Linux- P21:I will end on a note of carefree abandon—learn to steal! Once you’ve learned the pieces of the puzzle and how to combine them, there is very little new to invent. Every new idea you discover is a mere permutation of the old ideas. And ideas are free! Every cool feature discussed on TV shows or presented in the brochures or web sites of commercial HA companies can be taken, adapted, and implemented with the information presented here using very little effort | CHAPTER 5 COMMUNICATION Post Array sender 012345678 content Null Wow this might work you know inNumber 447786202240 submit Submit network UNKNOWN email none keyword NULL comments Wow this might work you know Both contain enough information to let you switch your lights on with a text message. The code is trivial as follows if _POST from 012345678 if _PoST text bedroom on system usr local bin heyu turn bedroom_light on else if _POST text bedroom off system usr local bin heyu turn bedroom_light off To eliminate the sending of fiddly text messages and perhaps save money you can test future permutations of this script with a simple web page. Using the simpler format you can write code such as the following form action echo.php method POST input name from value phone num input name text value your message here input name msgid value type hidden input name type value 1 type hidden input type submit value Send Fake SMS form Being on an open web server there are some security issues. You eliminate one by having the phone number verified by a piece of code on the server never validate credentials on the client . You can further limit another issue although not eliminate it by changing your simply named echo.php script to iuytvaevew.php employing security through obscurity so that it is not accidentally found. Some providers will call your web page using HTTPS which is the best solution and worth the extra time in setting up a specific username and password for them. You can rebalance the concepts of security and accessibility by allowing multiple phones to access the house by creating a white list of mobile phone numbers and by adding to this list explicitly. Or you could ban any access to your page from an IP that isn t similarly approved and known to be your gateway provider. If you were likely to be communicating a lot through SMS you could automatically add new phone numbers to a pending list of preapproved devices which in turns sends a notification message to the SMS
