Programming Tutorials

  You have successfully compiled the   lighting-app   example from the   esp-matter   SDK. You flash the ESP32, monitor the UART, and see the QR code URL. You pull out your iPhone, scan the code in Apple Home, and wait. The spinner rotates for 30 seconds, followed by the dreaded, non-descript error:   "Unable to Add Accessory." The UART logs on the ESP32 side show a BLE connection, a brief exchange, and then a sudden disconnect with an error like  SecureChannel: error 0  or  CASESession: error . This is the most common hurdle in professional Matter development. It is rarely a code syntax error; it is almost always a failure in the  Device Attestation Procedure  or  Storage Partitioning . The Root Cause: Device Attestation and Factory Data Matter relies on a rigorous security handshake known as PASE (Passcode Authenticated Session Establishment). During commissioning, the Commissioner (the phone/hub) challenges the Accessory (ES...