Hello,
I am developing a simple app for nRF51822 which sends notification data to a characteristic with a random value. All seems to work good but while testing in-depth and searching for bugs, I found something I am not able to explain and fix.
While connected to the peripheral with and Android device (5.0.2) and nRF Master Control Panel app, I search for my characteristic and I enable notifications. It sends/recieves properly. Then I disable the notifications. And repeat the process 4 times.
At the 4th time, when I enable the notification, I do not receive any notification and after a few seconds, the peripheral disconnects with a GATT error.
Is there any kind of internal limitation for enabling/disabling notifications for the chip? What am I missing?
This is the notifications callback I use:
uint32_t value_change(ble_NOTIF_t * p_lbs, uint8_t * mData)
{
uint32_t err_code = NRF_SUCCESS;
uint16_t len = 6;
err_code = sd_ble_gatts_value_set(p_lbs->notif_handles.value_handle,
0,
&len,
mData);
if (err_code != NRF_SUCCESS)
{
return err_code;
}
if(isNotifyEnable == 0x01)
{
ble_gatts_hvx_params_t hvx_params;
memset(&hvx_params, 0, sizeof(hvx_params));
hvx_params.handle = p_lbs->notif_handles.value_handle;
hvx_params.type = BLE_GATT_HVX_NOTIFICATION;
hvx_params.offset = 0;
hvx_params.p_len = &len;
hvx_params.p_data = mData;
err_code = sd_ble_gatts_hvx(p_lbs->conn_handle, &hvx_params);
}
else
{
err_code = NRF_ERROR_INVALID_STATE;
}
return err_code;
}
Where mData is a 6 bytes array with the random value.
The notifications is triggered by a timer every second.
The disconnection error is:
nRF Master Control Panel, 2015-05-18
No name (F3:F7:E9:5F:66:07)
V 08:53:00.758 Connecting to F3:F7:E9:5F:66:07...
D 08:53:00.767 gatt = device.connectGatt(autoConnect = false)
D 08:53:16.540 [Callback] Connection state changed with status: 0 and new state: 2 (CONNECTED)
I 08:53:16.565 Connected to F3:F7:E9:5F:66:07
...
V 08:53:50.198 Enabling notifications for 00000003-0000-1000-8000-00805f9b34fb
D 08:53:50.214 gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00)
I 08:53:50.319 Data written to descr. 00002902-0000-1000-8000-00805f9b34fb, value: (0x) 01-00
A 08:53:50.332 "Notifications enabled" sent
V 08:53:50.360 Notifications enabled for 00000003-0000-1000-8000-00805f9b34fb
I 08:53:51.294 Notification received from 00000003-0000-1000-8000-00805f9b34fb, value: (0x) 80-FF-00-00-80-1E
...
V 08:53:52.846 Disabling notifications for 00000003-0000-1000-8000-00805f9b34fb
D 08:53:52.867 gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x00-00)
I 08:53:52.952 Data written to descr. 00002902-0000-1000-8000-00805f9b34fb, value: (0x) 00-00
A 08:53:52.967 "Notifications and indications disabled" sent
V 08:53:52.999 Notifications and indications disabled for 00000003-0000-1000-8000-00805f9b34fb
... x3
V 08:54:05.765 Enabling notifications for 00000003-0000-1000-8000-00805f9b34fb
D 08:54:05.782 gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00)
E 08:54:25.833 Error (0x85): GATT ERROR
D 08:54:25.874 [Callback] Connection state changed with status: 8 and new state: 0 (DISCONNECTED)
E 08:54:25.891 Error (0x8): GATT INSUF AUTHORIZATION
D 08:54:25.910 gatt.refresh()
I also got this error with another device for the same situation:
V 14:05:28.239 Enabling notifications for 00000003-0000-1000-8000-00805f9b34fb
D 14:05:28.255 gatt.writeDescriptor(00002902-0000-1000-8000-00805f9b34fb, value=0x01-00)
E 14:05:35.309 Error (0x85): GATT ERROR
D 14:05:35.339 [Callback] Connection state changed with status: 0 and new state: 0 (DISCONNECTED)
I 14:05:35.365 Disconnected
EDIT:
I call the notification in the timer handler like:
void timer_handler(void * p_context)
{
uint32_t err_code;
err_code = value_change(&p_lbs, mData);
if (err_code != NRF_SUCCESS && err_code != BLE_ERROR_INVALID_CONN_HANDLE && err_code != NRF_ERROR_INVALID_STATE)
{
APP_ERROR_CHECK(err_code);
}
}
And as you can see it handles the error code with the default APP_ERROR_CHECK. Maybe I should let it handle also the BLE_ERROR_INVALID_CONN_HANDLE and NRF_ERROR_INVALID_STATE with APP_ERROR_CHECK also?
I try to record a sniffer trace and as soon as I have it I post it here.
Thanks in advance for your help!
Best regards,
margabro.
