How to connect and disconnect a Bluetooth device with a PowerShell script on Windows?

Try something like this, note that elevated permissions are required:

$device = Get-PnpDevice -class Bluetooth -friendlyname "FriendlyDeviceName"Disable-PnpDevice -InstanceId $device.InstanceId -Confirm:$falseStart-Sleep -Seconds 10Enable-PnpDevice -InstanceId $device.InstanceId -Confirm:$false

This script disables the device and after 10 seconds enables it again.

Try this Powershell script, it disables, and unpairs the Bluetooth peripheral(source).Many thanks to xzion14!

$Source = @"   [DllImport("BluetoothAPIs.dll", SetLastError = true, CallingConvention = CallingConvention.StdCall)]   [return: MarshalAs(UnmanagedType.U4)]   static extern UInt32 BluetoothRemoveDevice(IntPtr pAddress);   public static UInt32 Unpair(UInt64 BTAddress) {      GCHandle pinnedAddr = GCHandle.Alloc(BTAddress, GCHandleType.Pinned);      IntPtr pAddress     = pinnedAddr.AddrOfPinnedObject();      UInt32 result       = BluetoothRemoveDevice(pAddress);      pinnedAddr.Free();      return result;   }"@Function Get-BTDevice {    Get-PnpDevice -class Bluetooth |      ?{$_.HardwareID -match 'DEV_'} |         select Status, Class, FriendlyName, HardwareID,            # Extract device address from HardwareID            @{N='Address';E={[uInt64]('0x{0}' -f $_.HardwareID[0].Substring(12))}}}################## Execution Begins Here ################$BTDevices = @(Get-BTDevice) # Force array if null or single item$BTR = Add-Type -MemberDefinition $Source -Name "BTRemover"  -Namespace "BStuff" -PassThruDo {   If ($BTDevices.Count) {      "`n******** Bluetooth Devices ********`n" | Write-Host      For ($i=0; $i -lt $BTDevices.Count; $i++) {         ('{0,5} - {1}' -f ($i+1), $BTDevices[$i].FriendlyName) | Write-Host      }      $selected = Read-Host "`nSelect a device to remove (0 to Exit)"      If ([int]$selected -in 1..$BTDevices.Count) {         'Removing device: {0}' -f $BTDevices[$Selected-1].FriendlyName | Write-Host         $Result = $BTR::Unpair($BTDevices[$Selected-1].Address)         If (!$Result) {"Device removed successfully." | Write-Host}         Else {"Sorry, an error occured." | Write-Host}      }   }   Else {      "`n********* No devices foundd ********" | Write-Host   }} While (($BTDevices = @(Get-BTDevice)) -and [int]$selected)