Specifications

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means the setting fails
5.7 Bluetooth connection interval setting
Command format: AT+CIT=30,45\r\n
Return value: OK\r\n
ERR:CODE\r\n
Content: Set the minimum Bluetooth connection interval to 30ms, the
maximum connection interval to 45ms, and the effective Bluetooth
connection interval to 10ms-4000ms
5.8 Bluetooth broadcast operation commands
Command format: AT+ADV_STOP\r\n
Return value: OK\r\n
ERR:CODE\r\n
Content: Stop Bluetooth broadcast
Command format: AT+ADV_START\r\n
Return value: OK\r\n
ERR:CODE\r\n
Content: Turn on Bluetooth radio
5.9 Restore factory configuration command
Command format: AT+DEFAULT\r\n
Return value: OK\r\n
ERR:CODE\r\n
Contents: Restore the module to the original factory mode, returning 0K