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Multiple Client Connection on SPPDemo

Akshat Saraf
Intellectual 325 points
Other Parts Discussed in Thread: CC256XMSPBTBLESW, CC2564MODN

I am currently using CC2564modn module with MSP430F5234 in SPP application profile.

I am using CC256XMSPBTBLESW software stack.

I have already ported SPP Demo application for MSP430F5234 mcu. Now I want to communicate with multiple clients with SPP profile.

I have gone through the below link:

http://processors.wiki.ti.com/index.php/CC256x_Bluetopia_Software_Add-on:_Multiple_SPP_Connections

But it is using SPPLEDemo application. My requirement is to do it with SPPDemo.

I tried but my CC2564MODN server is connecting only one Blueterm client.

what should i have to do?

  • 0
    TI__Guru* 85400 points
    Hi,

    The SPPDemo app supports one client at a time - you need to modify the demo app to support multiple clients. You can have a similar implementation as that of the SPPLEDemo app.

    Regards,
    Gigi Joseph.
  • 0 in reply to Joseph Gigi
    Intellectual 325 points

    Thank you very much Joseph.

    I am new to the TI's BLE stack. In the SPPLE Demo app how can I connect to multiple slave BLE peripheral ?

    when I set up the single connection to BLE client, I am not able to do AdvertiseLE again until client will disconnect.

    what should i have to do for connecting multiple BLE client ?

  • 0 in reply to Akshat Saraf
    TI__Intellectual 2360 points

    Akshat,

    The current SDKs support core specification version 4.0, which doesn't allow a peripheral to have multiple connections.

    Instructions for connecting to a peripheral as a client are documented here. The same procedure can be used for connecting to multiple peripherals.

    Thanks,
    Samuel

  • 0 in reply to Samuel
    Intellectual 325 points
    Thanks for your response Samuel.

    I have gone through the wiki document. Actually I have a communication setup like CC2564modn as Server (Advertising device)
    and two mobile devices as BLE client. After setting up connection between Server and first client(mobile) , there is no
    advertisement from the Server, so i am not able to find Server device in the scan device list of second client.
    I have tried command AdvertiseLE 1 again, but it is giving error.
    Please check the log :

    SPP+LE>AdvertiseLE 1
    GAP_LE_Advertising_Enable success.
    SPP+LE>
    etLE_Connection_Complete with size 18.
    Status: 0x00.
    Role: Slave.
    Address Type: Public.
    BD_ADDR: 0x34BB26D43778.
    SPP+LE>
    etGATT_Connection_Device_Connection with size 12:
    Connection ID: 1.
    Connection Type: LE.
    Remote Device: 0x34BB26D43778.
    Connection MTU: 23.
    GAP_LE_Advertising_Disable returned -1.
    GAP_LE_Advertising_Enable returned -107.
    SPP+LE>AdvertiseLE 1
    GAP_LE_Advertising_Enable returned -107.
    SPP+LE>

    please suggest what should i have to do?
  • 0 in reply to Akshat Saraf
    TI__Intellectual 2360 points

    Akshat,

    The current SDKs support core specification version 4.0, which doesn't allow a peripheral to have multiple connections, however, a central can have multiple connections. If you want to demo multiple connections you'll need at least 3 boards: 1 central and 2 peripherals.

    Thanks,
    Samuel

  • 0 in reply to Samuel
    Intellectual 325 points
    Hi Samuel,

    Thanks for your reply.

    I want to know how can I discover the services of peripheral device from the Central device. I want to know exactly which kind of services they are offering like Ti Sensor Tag. They are giving the service response like :

    SPP+LE>
    SPP+LE>DiscoverGAPS 5C313EBFEC0C
    GATT_Start_Service_Discovery success.

    SPP+LE>
    Service 0x0001 - 0x000B, UUID: 1800.

    SPP+LE>
    Service Discovery Operation Complete, Status 0x00.

    How can i list the services and their data?
  • 0 in reply to Akshat Saraf
    TI__Intellectual 2360 points

    Akshat,

    You can use the GATT_Start_Service_Discovery() function with the number of UUIDs set to 0 and the UUID list pointer set to NULL. For example:

    GATT_Start_Service_Discovery(BluetoothStackID, LEContextInfo[LEConnectionIndex].ConnectionID, 0, NULL, GATT_Service_Discovery_Event_Callback, 0);

    This will discover all services.

    Thanks,
    Samuel

  • 0 in reply to Samuel
    Intellectual 325 points

    Hi Samuel,

    Thank you very much.

    I will test and update you with my results.

  • 0 in reply to Akshat Saraf
    Intellectual 325 points

    Thanks Samuel. 

    It  is working absolutely fine. 

  • 0 in reply to Samuel
    Intellectual 325 points

    Hi Samuel,

    How are you?

    I am able to discover the services of the Peripheral using GATT_Start_Service_Discovery(). Now I want to read or write to the characteristics 

    of a particular service.

    Cane you please tell me how can I do this?

  • 0 in reply to Akshat Saraf
    TI__Intellectual 2360 points

    Akshat,

    There are examples of reading and writing characteristics in the SPPLEDemo app. An overview of the characteristics used in the app can be found here.

    To write to a characteristic you can use the GATT_Write_Request() or GATT_Write_Without_Response_Request() functions. To read a characteristic you can use the GATT_Read_Value_Request() function. The prototypes of these functions can be found in profiles\GATT\GATTAPI.h.

    Thanks,
    Samuel