I will build cellular iot firmware for lte m, nbiot and 2g 3g modules

Need a device that stays connected in the field, not just in a demo? I specialize in firmware for cellular and LPWAN-connected devices, with real production experience getting devices to survive carrier roaming, weak signal, and inconsistent APN behavior the stuff that breaks "works on my desk" firmware the moment it ships. Whether you're building a remote sensor, an asset tracker, or an industrial controller, I'll get your device talking reliably to your cloud or MQTT broker.

Features:

• Cellular module integration (SIM7080G, A7670E, BG96, RAK3112 and similar)
• MQTT / TCP / HTTP client implementation
• Dynamic APN detection by IMSI/MCC/MNC
• SIM roaming and multi-carrier failover handling
• Non-blocking state-machine architecture
• DNS caching and connection resilience
• Power-optimized sleep/wake connectivity cycles
• Zephyr RTOS / Raspberry Pi Pico SDK firmware

What will you get:

• Working, tested firmware source code
• A connectivity test report from real SIM/network testing
• Architecture and state-machine documentation
• One live debugging/integration session with your hardware
• Guidance to extend the connectivity layer yourself

Guarantee: I test for the dropped packet, the late DNS response,