List all available COM/serial ports. Returns device name, description, hardware ID, VID/PID.

Configure serial port parameters (baud rate, data bits, parity, stop bits, flow control). Can be called before or after opening the port.

Open the specified COM port and establish a serial connection.

Close the currently opened COM port connection.

Auto-detect all available COM ports. Tries common baud rates and sends an AT probe command to find responsive devices. Useful when unsure which port the device is connected to.

Send an AT command to the connected device and read the response. Auto-prepends AT prefix (e.g. 'CSQ' becomes 'AT+CSQ'). Supports standard AT and extended AT+ commands.

Batch-test AT commands. Sends a list of AT commands to the connected device and returns all results with automatic classification (PASS/OK/ERR/CME). Much more efficient than calling at_send_command repeatedly; good for validating a command list from the knowledge base.

Search the AT command knowledge base. Supports filtering by keyword (key/name/description/AT string) and source (3gpp/vendor/custom).

List available chipset knowledge base files. AI should call this first to know which platforms exist, then use at_knowledge_add to write to the appropriate platform file.

Add or update an AT command in the knowledge base. Stores in the specified chipset file (e.g. asr, quectel) or _custom. Use at_knowledge_chipsets to see available platforms.

List all commands in the knowledge base, optionally filtered by source. Shows key, name, and expected response summary.

Show knowledge base statistics: total commands, per-source YAML file breakdown, source distribution.