Users Manual

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reset failure. In the Bluetooth connection state, you cannot modify it. You need to
disconnect the Bluetooth connection.
5.12. Bluetooth Connection Interval Reset Command
Command format： AT+CIT=300\r\n
Return value： OK\r\n
ERR\r\n
Content: The effective Bluetooth connection interval is 10ms—2000ms, and the
factory default is 20ms. Reset the Bluetooth connection interval to 300ms. Return
OK to indicate successful reset and ERR to indicate reset failure.
Note: The module does not support modifying connection interval during the
dynamic process. The modification will take effect after restarting the module. In
the Bluetooth connecting state, it cannot be modified and the Bluetooth
connection needs to be disconnected. The shorter the Bluetooth connection
interval, the faster the Bluetooth communication rate and the higher the power
consumption.
5.13. Low-power Sleep Mode Setting Command
Command format： AT+SLEEP\r\n
Return value： OK\r\n
Content: When the module is in the idle state, in order to reduce the power
consumption, the module can be set to enter the sleep mode by the sleep
command. At this time, the Bluetooth and serial port functions are turned off, and
the power consumption is reduced. The module can be awakened by external
enabling. The power consumption in sleep mode is 0.3uA.
5.14. Firmware Upgrade Command
Command format： AT+DFU\r\n
Return value： OK\r\n
Content: After returning OK, the module enters the firmware upgrade mode. In this
mode, users can download the latest firmware patch released by our company to
upgrade the module firmware. After the update is completed, the new firmware will
automatically run.