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BTChat Example Server Does Not Appear on Raspberry Pi



  • When attempting to run the Bluetooth Chat example between a Windows 10 desktop (Qt 5.11) and a Raspberry Pi (Raspbian GNU/Linux 9 (stretch)) (Qt 5.7), it will connect and run properly when connecting from the RPi to the Windows (i.e. Windows in the server). When attempting to connect from Windows to the RPi, there is no service found.

    Looking on the RPi with the command: sdptool records --raw local

    I see the following output (reduced to two records) that indicates the program registered the service:

    Sequence
    	Attribute 0x0000 - ServiceRecordHandle
    		UINT32 0x00010007
    	Attribute 0x0001 - ServiceClassIDList
    		Sequence
    			UUID16 0x111f - HandsfreeAudioGateway
    			UUID16 0x1203 - GenericAudio
    	Attribute 0x0004 - ProtocolDescriptorList
    		Sequence
    			Sequence
    				UUID16 0x0100 - L2CAP
    			Sequence
    				UUID16 0x0003 - RFCOMM
    				UINT8 0x0d
    	Attribute 0x0005 - BrowseGroupList
    		Sequence
    			UUID16 0x1002 - PublicBrowseGroup
    	Attribute 0x0009 - BluetoothProfileDescriptorList
    		Sequence
    			Sequence
    				UUID16 0x111e - Handsfree
    				UINT16 0x0107
    	Attribute 0x0100
    		String Hands-Free Voice gateway
    	Attribute 0x0301
    		UINT8 0x01
    	Attribute 0x0311
    		UINT16 0x0000
    Sequence
    	Attribute 0x0000 - ServiceRecordHandle
    		UINT32 0x00010008
    	Attribute 0x0001 - ServiceClassIDList
    		Sequence
    			UUID128 e8e10f95-1a70-4b27-9ccf-02010264e9c8
    			UUID16 0x1101 - SerialPort
    	Attribute 0x0003 - ServiceID
    		UUID128 e8e10f95-1a70-4b27-9ccf-02010264e9c8
    	Attribute 0x0004 - ProtocolDescriptorList
    		Sequence
    			Sequence
    				UUID16 0x0100 - L2CAP
    			Sequence
    				UUID16 0x0003 - RFCOMM
    				UINT8 0x01
    	Attribute 0x0005 - BrowseGroupList
    		Sequence
    			UUID16 0x1002 - PublicBrowseGroup
    	Attribute 0x0009 - BluetoothProfileDescriptorList
    		Sequence
    			UUID16 0x1101 - SerialPort
    	Attribute 0x0100
    		String Bt Chat Server
    	Attribute 0x0101
    		String Example bluetooth chat server
    	Attribute 0x0102
    		String qt-project.org
    
    

    When inspecting the Bluetooth services from Windows I see the "Hands-Free Voice Gateway" but not the "Bt Chat Server":

    C:\Program Files (x86)\Bluetooth Command Line Tools\bin>btdiscovery -s
    (XX:XX:XX:XX:XX:xx)     raspberrypi     Unknown
            1800    0       Generic Access Profile
            1801    0       Generic Attribute Profile
            110E    0       AVRCP CT
            110E    0       AVRCP TG
            110D    0       Audio Source
            1108    12      Headset Voice gateway
            111E    13      Hands-Free Voice gateway
            1134    17      Message Notification
            1134    16      Message Access
            1130    15      Phone Book Access
            1104    14      Synchronization
            1106    10      File Transfer
            1105    9       Object Push
            5005    24      Nokia OBEX PC Suite Services
    
    

    What needs to be done such that the SDP record for the chat service is visible to remote clients?


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