Hi Usamak,
Thanks,
One question : in the pdf file AN11 section 8.2 in the scheme they said to enable extended messages. How do i do that. Here the code to setup channel 0 for searching.
Private Sub OpenSearch()
        'initialisatie hr parameters
        bRFChannel = {&H39;} '57
        bDevideTypeID = {0} '0
        If Not channel0 Is Nothing Then
            channel0.unassignChannel()
            channel0.closeChannel()
        End If
        channel0 = device.getChannel(0)
        AddHandler channel0.channelResponse, AddressOf ChannelResponse
        channel0.assignChannelExt(ANT_ReferenceLibrary.ChannelType.ADV_TxRx_Only_or_RxAlwaysWildCard_0x40, bAntNetNumber(0), ANT_ReferenceLibrary.ChannelTypeExtended.ADV_AlwaysSearch_0x01)
        channel0.setChannelID(device_id, False, bDevideTypeID(0), bantTransType(0))
        Thread.Sleep(50)
        channel0.setChannelPeriod(8192)
        Thread.Sleep(50)
        channel0.setChannelFreq(bRFChannel(0))
        Thread.Sleep(50)
        channel0.setChannelSearchTimeout(&HFF;)
        Thread.Sleep(50)
        channel0.openChannel()
        Thread.Sleep(50)
    End Sub
After trying,  i recieve the BROADCAST_DATA_0x4E message, but apperently the wrong contect, becase the check of the data is usable failes
  Private Sub ChannelResponse(ByVal response As ANT_Response)
        Dim message_bytes As Byte() = New Byte(response.messageContents.Length + 2) {}
        'Add header bytes as expected by the ProcessMessage function
        Select Case (CType(response.responseID, ANT_ReferenceLibrary.ANTMessageID))
            Case ANT_ReferenceLibrary.ANTMessageID.ACKNOWLEDGED_DATA_0x4F, ANT_ReferenceLibrary.ANTMessageID.BROADCAST_DATA_0x4E
                Try
                    Dim extMsgOffset As Byte = 10
                    'Check to make sure that the data received is useable
                    If ((response.messageContents.Length <= 9) OrElse ((response.messageContents(9) OrElse CType(ANT_ReferenceLibrary.LibConfigFlags.MESG_OUT_INC_DEVICE_ID_0x80, Byte)) = 0)) Then
                        Exit Select
                    End If
                    temp.usDeviceNum = CType((response.messageContents(extMsgOffset) Or (response.messageContents((extMsgOffset + 1)) + 8)), System.UInt16)
                    temp.ucDeviceType = response.messageContents((extMsgOffset + 2))
                    temp.ucTransType = response.messageContents((extMsgOffset + 3))
                Catch ex As Exception
                End Try
        End Select
        message_bytes(2) = response.responseID
        response.messageContents.CopyTo(message_bytes, 3)
        Dim d As New ProcessManager(Sub() ProcessMessage(message_bytes))
        d.BeginInvoke(Nothing, Nothing)
    End Sub