An IoT module wraps a radio system on chip with everything needed to make it work: crystal, power regulation, RF matching, shielding, often an antenna, and a firmware stack that exposes a simple interface such as AT commands over UART or a host API. Modules exist for Wi-Fi, Bluetooth, LoRa, Zigbee and Thread, and most importantly for cellular, where the chipset, protocol stack and carrier approvals are far beyond what a product team can take on alone.
The value is time and risk. A module arrives with regulatory certifications such as FCC certification and CE, and cellular modules add carrier certifications, so the finished product needs far less testing. The price per unit is higher than the bare chip, which matters at very high volumes, and the product is tied to the module vendor’s roadmap and end-of-life schedule.
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