Unsuccessful connection with Motorola Moto G 6

Installer: simplelink_cc13x2_26x2_sdk_3_20_00_68

Peer device: Motorola Moto G 6. (Customer has also reproduced with Samsung Note 9 ).

Problem description:
The CC2652R runs a project based on multi role. Every 1 second the program checks whether the connection is active based on the return status of linkDB_State() with the connection handle and LINK_CONNECTED. The customer discovered that in certain cases  linkDB_State(pClient->connHandle, LINK_CONNECTED) returns TRUE, but no GAP_LINK_ESTABLISHED_EVENT has been received in the application. This check is performed 5 seconds after the last connection event, so there is no reason why linkDB should think the connection is still active.

Using a sniffer I can see the motorola phone send a connection request packet (frame 21,904) and several connection events, but the CC26x2 does not respond. (See attached sniffer log.)

We have only been able to reproduce this situation with a couple of phones acting as the BLE master. The bug can appear on the first connection or after a short while (usually under 5 minutes) of connecting and disconnecting. The following phones were used:

• Motorola Moto G 6
• Samsung Note 9