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Golioth Investigates: A Cellular Connectivity Mystery

2025-02-26

Golioth recently encountered a perplexing cellular connectivity issue: some devices using a specific vendor's chipset experienced connection failures after OTA firmware updates. Investigation revealed the problem stemmed from some NB-IoT networks not adhering to 3GPP specifications, causing the modem to fail to obtain DNS server addresses correctly. The Golioth team, by deeply analyzing 3GPP specifications, modem trace data, and network protocols, ultimately found a workaround, but also exposed the drawbacks of closed ecosystems and lack of transparency, calling for greater industry transparency to improve cellular connectivity reliability.

Solving NAT Timeouts for IoT Devices with Connection IDs

2025-02-14

Network Address Translation (NAT) timeouts frequently interrupt IoT device-cloud communication, necessitating frequent reconnections and wasting resources. This post demonstrates how Golioth leverages DTLS 1.2 Connection IDs to mitigate this. By configuring the Golioth firmware SDK to disable keep-alive messages and set appropriate receive timeouts, coupled with Connection IDs, devices maintain connectivity even after NAT timeouts without costly handshakes, reducing power consumption and improving efficiency. This is particularly crucial for battery-powered, low-power devices.

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