Golioth experienced connectivity issues on a vendor’s cellular chipset series, leading to a deep investigation. Reports pointed to erratic behavior after firmware updates. The Zephyr network shell showed successful DNS resolutions despite the error logs. The issue resided in the modem firmware, which was difficult to access and debug due to encryption. Nordic Semiconductor, though open, faced constraints due to the 3GPP. A workaround involved manually setting the DNS server address to resolve intermittent connection problems. Complexities of debugging wireless cellular issues highlight the challenges of closed ecosystems and firmware complications in large device deployments.
https://blog.golioth.io/the-miserable-state-of-modems-and-mobile-network-operators/