Error 8 (0x8) GATT CONN TIMEOUT On Android

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

daneilzhang — Fri, 10 Dec 2021 06:37:49 GMT

先断开系统的蓝牙连接

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

Aser — Fri, 26 Jul 2019 06:01:39 GMT

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

Aser — Fri, 26 Jul 2019 05:59:30 GMT

Hi I am currently working on the same TIMEOUT error during the same DFU progress. In the meantime, I posted a question on the Dev zone and found this post while waiting for a reply.
As I mentioned above, I changed the interval as shown in the picture below, but still the TIMEOUT error occurred and DFU did not succeed.
Could you help me with this problem?

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

Hung Bui — Fri, 16 Sep 2016 10:14:44 GMT

Yes, you can use PCA10028 and PCA10031.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

why_do_i_need_a_user_name — Fri, 16 Sep 2016 09:30:12 GMT

Is nrfSniffer compatible with either PCA10031 or PCA10028?

I don't have a nRF51822 Development kit.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

why_do_i_need_a_user_name — Fri, 16 Sep 2016 09:24:32 GMT

I have now tested the example boot-loader from SK9 running on a PCA10028 against the LG Android phone.

The DFU fails with "GATT ERROR" reported on the phone.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

Hung Bui — Fri, 16 Sep 2016 07:59:18 GMT

It's normal that increasing the preferred connection parameter will make DFU process slower and this will affect all other master devices.

I would need to have a sniffer trace recording (with the original connection parameter) to see what exactly caused the problem.

I was suspecting that there is a buffer overflow here because the connection was too short, but normally it should be OK with 15ms interval.

I assume you have the same problem when testing with the original bootloader.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

why_do_i_need_a_user_name — Thu, 15 Sep 2016 18:03:21 GMT

Do you suggest we keep the new settings?

Could the new settings adversely effect Android phones that currently work ok with this bootloader?

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

why_do_i_need_a_user_name — Thu, 15 Sep 2016 18:01:19 GMT

I changed the bootloader from

#define MIN_CONN_INTERVAL (uint16_t)(MSEC_TO_UNITS(15, UNIT_1_25_MS)) #define MAX_CONN_INTERVAL (uint16_t)(MSEC_TO_UNITS(30, UNIT_1_25_MS))

#define MIN_CONN_INTERVAL (uint16_t)(MSEC_TO_UNITS(30, UNIT_1_25_MS)) #define MAX_CONN_INTERVAL (uint16_t)(MSEC_TO_UNITS(60, UNIT_1_25_MS))

at your suggestion.

The DFU was then a success but very slow, compared to IPhone, at over 5 minutes.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

why_do_i_need_a_user_name — Thu, 15 Sep 2016 11:16:21 GMT

Could you clarify this: nRFConnect on Android can connect with our device but loses the connection after about 6 seconds

We are testing our bootloader with Android.

When I got the Android error message I thought if I used nRFConnect/nRFLogger I could collect detailed logs to help you diagnose the problem. The failed DFU is the problem we wish to resolve.

Was your device running bootloader firmware or your application ? Our device is running the dual bank bootloader example (with tiny modifications)

Did you start doing DFU before you get the GATT CONN TIMEOUT ? Yes, we select our device, start the UPLOAD, the upload begins then we get GATT CONN TIMEOUT

Have you tried to test with other Android phone ? Our customers have had success with other Android phones. I do not have access to other phone models at the moment.

I will make the changes to the bootloader that you have suggested and report back.

RE: Error 8 (0x8) GATT CONN TIMEOUT On Android

Hung Bui — Thu, 15 Sep 2016 10:33:10 GMT

Hi,

Could you clarify this: nRFConnect on Android can connect with our device but loses the connection after about 6 seconds

Was your device running bootloader firmware or your application ? Did you start doing DFU before you get the GATT CONN TIMEOUT ? Or simply connecting and let it be for 6 seconds and the timeout happened ?

Have you tried to test with other Android phone ?

I would suggest to test changing the connection parameters setting in the bootloader to increase the connection interval, I would suggest min to 30ms and max to 60ms just to check.