SWRA772 august   2023 CC2564C

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1 Introduction
  5. 2 Running the Bluetooth Code
  6. 3 Demo Application
    1. 3.1 Device 1 (Server) Setup on the Demo Application
    2. 3.2 Device 2 (Client) Setup on the Demo Application
    3. 3.3 Initiating Connection from Device 2
    4. 3.4 Identify Supported Services
    5. 3.5 Data Transfer Between Client and Server
    6. 3.6 Multiple SPPLE Connections Guide
  7. 4 Demonstrating SPP LE on an iOS Device with the LightBlue App
    1. 4.1 LightBlue Overview
    2. 4.2 SPP LE Service Overview
      1. 4.2.1 Characteristics
  8. 5 LightBlue as the Client/SPPLEDemo as the Server
    1. 5.1 Connecting the Devices
    2. 5.2 Enabling Notifications
    3. 5.3 Sending Data from LightBlue/Receiving Data in SPPLEDemo
    4. 5.4 Sending Data from SPPLEDemo/Receiving Data in LightBlue
  9. 6 LightBlue as the Server/SPPLEDemo as the Client
    1. 6.1 Connecting the Devices
    2. 6.2 Sending Data from LightBlue/Receiving Data in SPPLEDemo
    3. 6.3 Sending Data from SPPLEDemo/Receiving Data in LightBlue
  10. 7 Application Commands
  11. 8 General Commands
    1. 8.1 Help (DisplayHelp)
    2. 8.2 Get Local Address
    3. 8.3 Set Baud Rate
    4. 8.4 Quit
  12. 9 BR/EDR Commands
  13. 10GAPLE Commands
    1. 10.1  Set Discoverability Mode
    2. 10.2  Set Connectability Mode
    3. 10.3  Set Pairability Mode
    4. 10.4  Change Pairing Parameters
    5. 10.5  Advertise LE
    6. 10.6  Start Scanning
    7. 10.7  Stop Scanning
    8. 10.8  Connect LE
    9. 10.9  Disconnect LE
    10. 10.10 Pair LE
    11. 10.11 LE Pass Key Response
    12. 10.12 LE Query Encryption
    13. 10.13 Set Passkey
    14. 10.14 Discover GAPS
    15. 10.15 Get Local Name
    16. 10.16 Set Local Name
    17. 10.17 Get Remote Name
    18. 10.18 LE User Confirmation Response
    19. 10.19 Enable SC Only
    20. 10.20 Regenerate P256 Local Keys
    21. 10.21 SC Generate OOB Local Params
    22. 10.22 Set Local Appearance
    23. 10.23 Get Local Appearance
  14. 11SPPLE Commands
    1. 11.1 Discover SPPLE
    2. 11.2 Register SPPLE
    3. 11.3 LE Send
    4. 11.4 Configure SPPLE
    5. 11.5 LE Read
    6. 11.6 Loopback
    7. 11.7 Display Raw Mode Data
    8. 11.8 Automatic Read Mode
  15. 12References
  16. 13Revision History

5.4 Sending Data from SPPLEDemo/Receiving Data in LightBlue

Send data from SPPLEDemo to LightBlue. First LightBlue needs to provide SPPLEDemo with transmit credits. To provide SPPLEDemo with transmit credits do the following in LightBlue:

  1. Open the Tx Credits Characteristic (0xBA04C4B2-892B-43BE-B69C-5D13F2195392).
  2. Choose "Write new value".
  3. Type 6400. (100 credits = 0x0064 little-endian).
  4. Choose done.
  5. Press the back button in the top left corner.
The SPPLEDemo has 100 credits and can send data in SPPLEDemo using the LESend 5cfc3252180b 100 command. Observe the following in the terminal:
SPP+LE>LESend 5cfc3252180b 100
Send Complete, Sent 100.

To check that LightBlue received the data:

  1. Open the Tx Characteristic (0x0734594A-A8E7-4B1A-A6B1-CD5243059A57).
  2. Observe a long 0x30313233... string of the received data in the list of NOTIFIED VALUES as seen below:


GUID-20230227-SS0I-3FSD-LJMW-RZ5SP3DPNXHR-low.png

LightBlue has received the data and needs to return the transmit credits to SPPLEDemo. This can be done by repeating the sequence above and re-writing 0x6400 to the TxCredits Characteristic (0xBA04C4B2-892B-43BE-B69C-5D13F2195392).