Low tech way to connect G-Homa wifi plugs to your Google Home.
The quick explanation is that we going to find out which message the ghoma is app is sending to the G-Homa-Server to turn the plug on and off. This message we are going to immitate with a script. In this case PHP, because i use that on daily basis, but when you see the structure it is easy to set it up in different languages. Then we use the IFTTT app to connect a voice-command to a webhook (php script) to control the plug.
When you want to make your own server, look at this github repo: https://github.com/rodney42/node-ghoma
Make sure everything is installed (plug and app) and that you can control the wall plug with the app on your phone.
In order to see what message G-Homa is sending to the server we need to intercept the message. Herefore we use a proxytool. Install proxy software on your Mac or PC. I used https://www.charlesproxy.com/download/
Charles allows you to sniff the packets sent through HTTP from your actual device, the way you use it is simple:
Now you will see all the requests from your phone in Charles. We are only interested in the communication with the G-Homa server. So open the app on your phone and turn the G-Homa plug on and off. The look in Charles and look for http://m.g-homa.com: wsi > action > ActionWebService.asmx?wsdl (http://m.g-homa.com/wsi/action/ActionWebService.asmx?wsdl) Click on this, and on the right side on "contents" and on the lower bar on "Text". Here you see the exact SOAP message G-Homa sends:
<?xml version="1.0" encoding="UTF-8"?><v:Envelope xmlns:i="http://www.w3.org/2001/XMLSchema-instance" xmlns:d="http://www.w3.org/2001/XMLSchema" xmlns:c="http://schemas.xmlsoap.org/soap/encoding/" xmlns:v="http://schemas.xmlsoap.org/soap/envelope/"><v:Header /><v:Body><service xmlns="http://www.thinkhome.com.cn/" id="o0" c:root="1"><json i:type="d:string">{"head":{"code":"120"},"body":{"authentication":{"FUserAccount":"xxxxxx@xxxxxxxx.com","FPassword":"xxxxxxxxxxxxxxxxxxxxxx"},"action":{"FActionType":"5","FActionNo":"xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx","FKeyNum":"0","FAction":"1","FValue":""}}}</json></service></v:Body></v:Envelope>
Copy and Paste the message to the clipboard.
!!! Here you see that your username and encrypted password are send over http:// which is easily to intercepted. Best would be that G-Homa should send the request over https://.
You can use the sample PHP file. Keep in mind it is a sample and it is not secure! Get your FUserAccount, FPassword and FActionNo from the message and use it in the PHP Script. Save the script on a location which can be reached over the internet. Usage: ON = http://www.somewhere-online-you-put-the-file.com/plugController.php?plug=on OFF = http://www.somewhere-online-you-put-the-file.com/plugController.php?plug=off
Call it via your browser and you should be able to control the plug.
!!! Keep in mind this is not a very secure method. Everybody who knows the urls can make the call over the internet and control the plugs. You probably can figure out some ways to make it more secure.
Make sure the app is installed working correctly.
Make another one for "Lights off".
When everything is setup and in place. You can shout "OK GOOGLE LIGHTS ON" and "OK GOOGLE LIGHTS OFF" all night long.. all night.. long.