CC2640: My ios App can not discovers the services of my CC2640 as soon as I add my separate SYS/BIOS tasks

Hi Leoni,

Can you use a sniffer to make sure the CC2640 is indeed advertising?

What app are you using on the iPhones? Does the app enable any filter?

I did sniffer and it is advertising. The last message my peripheral received from the Iphone X was a request for a MTU exchange and my Iphone didn't receive anything. My mtu size is 65.

I'm using connection parameters such as slave latency, advertise interval, min and max interval and connection timeout as depicted in the Bluetooth low energy section from `Accessory Design Guidelines for Apple Devices` https://developer.apple.com/accessories/Accessory-Design-Guidelines.pdf.

I'm using 2 apps. The LightBlue  and a custom App. No matter which app I use, the problem is the same (in light blue I get stuck in the interrogating part, and in my App I get stuck at discovering the services).

A curious event happens when: Try to connect with the IphoneX, with NO success. Following that, I connect using my Iphone 8, with success and for a short period of time, I can connect using the Iphone X.

Has anyone faced a problem similar to this?

Here's the sniffer screenshot when we're connecting the Iphone X to our board.

Hi Leoni,

Can you post the sniffer log with the Service discovery request packet sent from the master?

Here are the shiffer logs for a bugged connection and for a healthy connection.

Healthy: healthy conection.psd

Bad: bugged connection.psd

Hi Leoni,

1) Can you tell me what the difference is between the the two sniffer logs? (Different phone model etc?)

2) I agree that this looks like a bug in the TI BLE-Stack. Can you give me precise steps to reproduce this?

3) What happens if you send a Read By Type Request with different starting handle and ending handle, e.g. 0x001 and 0xFFFF?

Hi Leoni,

I haven't heard back from you so I will close this thread due to inactivity.