5.3.3.1 Start Bluetooth Low Energy Scanning
Format: F[,<hex16>,<hex16>]
Use command F to automatically switch the device into central GAP role and start Bluetooth Low Energy scanning.
If no parameter is provided, command F starts the process of scanning with a default scan interval of 375 ms and a scan window of 250 ms. The command F receives two optional parameters that determine the scan interval and scan window. The input parameters are 16-bit hex format. Each parameter (scan interval and scan window) has a unit of 0.625 ms. The scan interval and the scan window values can range from 2.5 ms to 40.959s.
Note: The scan interval must be larger than or equal to the scan window. Use the
X command (v1.0) or DF command (v1.2 and later) to stop and active scan.| Item | Firmware Version 1.0 and Later | Description |
|---|---|---|
| Default: | 375 ms for scan interval, 250 ms for scan window | |
| Example: | F,01E0,0190 | Start inquiry with 300 ms scan interval and 250 ms scan window |
| Response: | Scanning | Start scanning |
%<Address>,<Addr_Type>,<Name>,<UUIDs>,<RSSI>>,<Tx PHY>,<Rx PHY>% | Connectable | |
%<Address>,<Addr_Type>,<RSSI>,<Tx PHY>,<Rx PHY>,Brcst:<Broadcast Payload>% | Non-connectable | |