BLE pairing security for IoT: use LE Secure Connections, understand Just Worksguide · unverified · Legacy BLE pairing can be cracked from a sniffed pairing exchange. Use LE Secure Connections (ECDH, Bluetooth 4.2+) and an association model with MITM protection where it matters, and add application-level security.
Zigbee pairing fails or the interview never completes: what to tryprocedure · unverified · Open the network (Zigbee2MQTT permits joining for 254 s), factory-reset the device, pair closer to the coordinator or a router, keep battery devices awake during the interview, and reduce interference.