I thiink you are asking too many questions at once. It usually helps to solve one problem at a time. AFAICT, you are dealing with three problems: how to establish communication between the phone and the device (although that's somewhat confusing, since a smart phone is frequently referred to as a device), a means of getting the data from the device into an application on the phone, a means of displaying the data on a map. BTW, have you solved the last problem already?
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