BLE Disconnects immediately after connection - disconnect reason 0x2A

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

aircheese — Tue, 28 Nov 2017 14:57:43 GMT

I just fix the problem by adding case BLE_GAP_EVT_PHY_UPDATE_REQUEST: to my void ble_evt_handler The reason is the update of conn parameter didnt got a handle. My code was copied from thingy, but i found the solution when i finally decided to write my own codes.

        case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
    {
        rt_kprintf("PHY update request.");
        ble_gap_phys_t const phys =
        {
            .rx_phys = BLE_GAP_PHY_AUTO,
            .tx_phys = BLE_GAP_PHY_AUTO,
        };
        err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
        APP_ERROR_CHECK(err_code);
    } break;

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

aircheese — Tue, 28 Nov 2017 11:13:20 GMT

Hi, Same here while i am using SD132 V5 on NRF52 + Xiaomi 6. disconnected at 40s every time. Did you manage to find a solution?

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Petter Myhre — Thu, 06 Jul 2017 08:49:45 GMT

Yes, it will probably decrease the maximum throughput. But the LL packet length is more important than the ATT MTU.

See this and this MSCs for more information.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

frank zhang — Wed, 05 Jul 2017 07:43:32 GMT

Hi Petter, this issue is caused by NRF_BLE_GATT_MAX_MTU_SIZE = 158. Here I changed NRF_BLE_GATT_MAX_MTU_SIZE to 23, the connection will be OK. I want to know does this change impact nrf_uart's transmission speed? Or can we add some code to negotiate ble_cfg.conn_cfg.params.gatt_conn_cfg.att_mtu's value when setting up connection?

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

frank zhang — Tue, 04 Jul 2017 08:05:32 GMT

No, I have no Nexus 6P. And I find that even my board send ack to nrf_uart_v20 in Huawei/xiaomi cellphone, sometimes it sill will be disconnected.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

frank zhang — Tue, 04 Jul 2017 07:50:39 GMT

I have tried with Nexus 7/Android 6.0, it works fine. But if I use Huawei/Xiaomi cellphone connect with nrf_uart_v20, it will be disconnected in 40-41 seconds(very accurate)。 And if I send a command from nrf_uart to my board and board reply an ack, the connection will be OK. If no reply, the connection will be disconnected.

These cellphone work fine with old SDK5-6-7 and NRF51822.

Here I just give you some information, I believe many other developers has met same problem.

please help.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Petter Myhre — Wed, 03 May 2017 14:58:58 GMT

@frank zhang, are you also testing with Nexus 6P? I tested with a Nexus 5X with Android 7.1.2, it seems to be working fine. I'll try to get a hold a 6P.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

frank zhang — Wed, 03 May 2017 09:56:01 GMT

I met the same issue.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Abi K — Sun, 30 Apr 2017 16:46:28 GMT

Yes. I used an unmodified example from the sdk. Nexus 6p Android version - 7.1.2 Yes. Same issue happens using nRF Connect as well.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Petter Myhre — Fri, 28 Apr 2017 10:20:52 GMT

Thank you. I'm not entirely sure what is happening. Will try to reproduce. You are using the unmodifed example from the SDK right? What Android version are you running on the Nexus 6P? Does the same thing happen if you use nRF Connect?

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Abi K — Thu, 27 Apr 2017 17:23:36 GMT

I have not been able to get wireshark to work for me. I have to uninstall and reinstall Wireshark. But here are the capture logs - link text

Thanks, Abi

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Petter Myhre — Wed, 26 Apr 2017 07:24:29 GMT

You need a separate board to run the sniffer, the following are supported:

nRF51822 Evaluation Kit (PCA10001) and a mini USB cable
nRF51422 Evaluation Kit (PCA10003) v3.0.0 or later and a mini USB cable
nRF51822 Development Kit dongle (PCA10000)
nRF51-DK (PCA10028) v1.0.0 or later and a micro USB cable
nRF51 Dongle (PCA10031)

See this for more information.

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Abi K — Wed, 26 Apr 2017 01:05:00 GMT

I am running the ble_app_uart app on the DK. Can i run the sniffer on top of that? From the docs it looks like the sniffer is an independent app on the DK. Please elaborate

RE: BLE Disconnects immediately after connection - disconnect reason 0x2A

Petter Myhre — Wed, 19 Apr 2017 11:56:23 GMT

Can you do a sniffer trace of the connection? You can use nRF Sniffer.