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RTOS/CC2640: Reject L2CAP connection

Part Number: CC2640

Tool/software: TI-RTOS

We're using CC2640 to connect with Apple Watch, We finished the BLE connection and the SC OOB pairing and then the Apple Watch will initiate a L2CAP connection with CC2640 and do the MFi certification communication on it. 

The pictures below are the log of the Apple Watch:

When the Apple Watch sent LE Credit Based connection Request to CC2640, CC2640 reject this connection, as below:


 But we use Nordic chip to test this connection, it is normal, as below:


    Do you know why CC2640 reject this connection request?
 
       Also about CC2642,We don`t find any about SC_OOB on the BLE 5.0 SDK(simplelink_cc26x2_sdk_2_30_00_34), On the CC2640 we use “GAPBondMgr_SetParameter“ to set GAPBOND_REMOTE_OOB_SC_ENABLED,But on the CC2642 5.0 SDK we not find any same function. Do you know how to use the SC_OOB function on the CC2642. 
 
    In the future, we need change the chip from CC2640 to CC2642. Our customer need more ram and flash to do other app function. 
    
    Thanks for your great support!