Get GPS location every x seconds and x meter distance and send messages to server. If app is killed by Android OS then it should restart automatically and start sending messages to server in JSON format. It should work on most latest mobile including xiomi, lfy, sony, samsung, 1+1..5 and other popular brands.
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I am specialized in HTML, PHP, JS and CSS with 9 years of experience. Some of my work in Website Development: [login to view URL] Looking forward to hearing from you.