Developers share lessons on decoding €20 GPS trackers in Go

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A DEV Community post describes the challenge of working with low-cost GPS trackers that use either the binary GT06 protocol or the plain-text H02 protocol, whose documentation is often fragmented across PDFs for differing firmware. The author, drawing on production experience at trackportal.com, presents a standard-library Go listener and simulator for replaying real tracker sessions. The article explains the key differences: GT06 uses binary framing, device identity only in the login packet, and acknowledgements with CRCs, while H02 uses ASCII messages that carry the device ID each time and need no reply. It also covers handling TCP stream framing with per-connection decoders. The authors offer a test account for readers who want to try their own trackers.

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