Has anyone tried creating code for sending the iotawatt data via usb-interface and populate influxdb instead of using wifi? If yes, please share your experience with this.
The reason why I am asking is that we are experiencing some instabilities with the wifi connectivity and we are looking to make it more stable. (the wifi instabilities are a separate thread, so no need to dive into that here 
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IMO asynchronous data transmission over a serial link would be far inferior to a synchronous, error correcting protocol like TCP/IP used with the WiFi connection. Not to mention faster and routable.
Better to investigate your WiFi environment problems and resolve. IoTaWatt has no trouble when connected to robust WiFi.