Creating a SDP record for Basic printing profile

Nishal,

Can you clarify what your intention is? Is your plan to implement the BPP profile yourself? If so then which role do you want to implement, Printer or Sender? If you are implementing the printer and you simply want multiple instances of a printer on a single device, then you don't need to register multiple SPP ports, you need to register multiple SDP records, from the BPP 1.2 spec:

"If a Bluetooth device supporting the Bluetooth Basic Printing Profile can serve more than one Printer, it may register more than one Service Record according to the table below. The Service Records shall have different values for the RFCOMM channel number to be used when connecting to the printing service, in addition to other entries in the Service Records as appropriate."

Regardless, I reviewed the BPP spec and specifically the SDP service record. I'm not sure which role you want to implement, and I'm assuming the printer role. Your code is a little off for what I think you are trying to do. To add a BPP printer service record, following "Table 12.1: Basic Printing Service Record (Printer)" in the BPP 1.2 spec, you can use something similar to the following code:

int                        ret_val;
SDP_UUID_Entry_t           SDPServiceClassUUIDEntries[2];
SDP_Data_Element_t         BluetoothProfileDescriptorListDataElement;
SDP_Data_Element_t         ProfileDescriptorDataElement;
SDP_Data_Element_t         BPPProfileDescriptorDataElementList[2];
GOEP_SDP_Service_Record_t  GOEPSDPServiceRecord;

/* Initialize the Service Class UUIDs.                   */
SDPServiceClassUUIDEntries[0].SDP_Data_Element_Type = deUUID_16;
ASSIGN_SDP_UUID_16(SDPServiceClassUUIDEntries[0].UUID_Value.UUID_16, 0x11, 0x23);

SDPServiceClassUUIDEntries[1].SDP_Data_Element_Type = deUUID_16;
ASSIGN_SDP_UUID_16(SDPServiceClassUUIDEntries[1].UUID_Value.UUID_16, 0x11, 0x18);

/* Initialize the GOEP SDP Service Record structure.     */
GOEPSDPServiceRecord.NumberServiceClassUUID = sizeof(SDPServiceClassUUIDEntries)/sizeof(SDPServiceClassUUIDEntries[0]);
GOEPSDPServiceRecord.SDPUUIDEntries         = SDPServiceClassUUIDEntries;
GOEPSDPServiceRecord.ProtocolList           = NULL;

ret_val = GOEP_Register_SDP_Record(BluetoothStackID, ServerPortNumber, &GOEPSDPServiceRecord, "PRODUCT", &SDPServiceRecordHandle);

if(!ret_val)
{
   /* The Service Record was successfully created, next  */
   /* format the Bluetooth Profile Descriptor List Data  */
   /* Element.                                           */
   BluetoothProfileDescriptorListDataElement.SDP_Data_Element_Type                      = deSequence;
   BluetoothProfileDescriptorListDataElement.SDP_Data_Element_Length                    = sizeof(ProfileDescriptorDataElement)/sizeof(SDP_Data_Element_t);
   BluetoothProfileDescriptorListDataElement.SDP_Data_Element.SDP_Data_Element_Sequence = &ProfileDescriptorDataElement;

   /* Initialize Profile Descriptor #0.                  */
   ProfileDescriptorDataElement.SDP_Data_Element_Type                      = deSequence;
   ProfileDescriptorDataElement.SDP_Data_Element_Length                    = sizeof(BPPProfileDescriptorDataElementList)/sizeof(SDP_Data_Element_t);
   ProfileDescriptorDataElement.SDP_Data_Element.SDP_Data_Element_Sequence = BPPProfileDescriptorDataElementList;

   /* Initialize the Profile UUID and Version Number Data*/
   /* Elements.                                          */
   BPPProfileDescriptorDataElementList[0].SDP_Data_Element_Type   = deUUID_16;
   BPPProfileDescriptorDataElementList[0].SDP_Data_Element_Length = sizeof(BPPProfileDescriptorDataElementList[0].SDP_Data_Element.UUID_16);
   ASSIGN_SDP_UUID_16(BPPProfileDescriptorDataElementList[0].SDP_Data_Element.UUID_16, 0x11, 0x22);

   BPPProfileDescriptorDataElementList[1].SDP_Data_Element_Type                  = deUnsignedInteger2Bytes;
   BPPProfileDescriptorDataElementList[1].SDP_Data_Element_Length                = sizeof(BPPProfileDescriptorDataElementList[1].SDP_Data_Element.UnsignedInteger2Bytes);
   BPPProfileDescriptorDataElementList[1].SDP_Data_Element.UnsignedInteger2Bytes = PROFILE_VERSION_YOU_PLAN_TO_IMPLEMENT (0x0100 or 0x0102);

   if((ret_val = SDP_Add_Attribute(BluetoothStackID, *SDPServiceRecordHandle, SDP_ATTRIBUTE_ID_BLUETOOTH_PROFILE_DESCRIPTOR_LIST, &BluetoothProfileDescriptorListDataElement)) >= 0)
   {
      /* Continue adding other mandatory attributes, such*/
      /* as the "Additional Protocol Descriptor Lists",  */
      /* "Document Formats Supported", "Character        */
      /* Repertoires Supported", "XHTML-Print Image      */
      /* Formats Supported", and "1284ID" attributes,    */
      /* using the SDP_Add_Attribute() function.         */
      TODO:
   }
}

Thanks,
Samuel

Nishal,

There are no limitations. I think the code you were using wasn't formatting the SDP record properly though. Please use the code I sent as a reference, and refer to the BPP spec 1.2 spec to see the SDP record my code would create (https://www.bluetooth.org/en-us/specification/adopted-specifications).

Thanks,
Samuel