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How to initiate connection to a GPRS enabled tracking device

Data transfers have to be initiated by the GPRS module; your cellular provider will have a firewall that blocks all connection requests that originate from the internet. The usual way round this is to ...
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Sensor suggestions for accurate drone speed testing

Here's an alternative solution to what you're shown. Create a way of having a bright point light from the drone. Have a way where you take two pictures that captures this point of light from the drone....
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