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The Windows Bluetooth stack reads the vendor-specific command code from a registry key, VsMsftOpCode. Notifying Windows Bluetooth stack of the vendor specific command code Microsoft doesn't specify how to get the chosen code. The vendor must communicate the chosen value through a method other than the controller. The controller could interpret the command as a destructive operation such as updating the controller's firmware. It's unsafe to issue a vendor-specific command and depend on the controller to reject the command if it doesn't understand it. Microsoft can't choose a command code and assume that no other vendor uses the code for a conflicting purpose. The vendor must choose the value of the Microsoft-defined command code. Vendors define values in the range 0xFC00 through 0xFFFF, allowing for 1024 different possible vendor-assigned command codes. The Bluetooth organization defines values in the range 0x0000 through 0xFBFF. Requirementsīluetooth HCI commands are identified by a 16-bit command code. Bluetooth controller implementers can use these extensions to implement special features. Microsoft defines vendor-specific HCI commands and events that are consumed by Windows. Bluetooth specifications allow vendor-defined HCI commands and events to enable nonstandardized interaction between hosts and controllers.

The RSSI on the nRF Connect app is always about ~15-20 dBm weaker than that read by the read_conn_rssi function.The Bluetooth Host-Controller Interface (HCI) specifies all interactions between a host and a Bluetooth radio controller.

The RSSI on the application is always different to the RSSI that is read from the read_conn_rssi function. I am also connecting the SoC to my Android phone and reading the remote RSSI using the macros provided on the app. I am printing the RSSI (using printk) on the nRF terminal.

The function, read_conn_rssi (attached below), is taken from the Bluetooth sample, Bluetooth: HCI Power Control. I am using a function in my source code that reads the current RSSI of the connection.

I am developing the nRF52833 DK with NCS v2.00.