Call webservice from gps device

I have a web service which I want to call from GPS device. I have hosted this web service on hosted server and this web service has a method called upload. This method accept a string parameter.

Currently I am calling this web service from a mobile phone with 开发者_开发百科this url http://www.abc.com/Default.asmx/Upload?str=1,73.0667,33.6

Now I want to call this web method from GPS device, the problem is that GPS device accept only IP address and port no. It does not accept URL and web method.

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Create a proxy service which is callable by the GPS device ("IP address and port no."), which in turn makes the desired webservice call, does whatever formatting to the data is needed, and returns it to the GPS device in whatever format you want it for the GPS device.