Search found 6 matches

by kxJiang
Tue Mar 13, 2018 5:59 am
Forum: ESP-IDF
Topic: Should we check the BLE connection when we call esp_ble_gattc_read_char?
Replies: 2
Views: 4469

Re: Should we check the BLE connection when we call esp_ble_gattc_read_char?

Hi,kolban. Thanks for your reply! Your are right. When we call esp_ble_gattc_read_char() in such situations that is when the BLE connection is broken, I got the ESP_GATT_ERROR from the "status" field under ESP_GATTC_READ_CHAR_EVT event. I haven't process this error, that caused ESP32 failed since I ...
by kxJiang
Mon Mar 12, 2018 9:24 am
Forum: ESP-IDF
Topic: Should we check the BLE connection when we call esp_ble_gattc_read_char?
Replies: 2
Views: 4469

Should we check the BLE connection when we call esp_ble_gattc_read_char?

hi, if the ble connection between ESP32 and a device is suddenly broken, when we are periodically calling esp_ble_gattc_read_char ESP32 will run crash. Is there any safe manner to call esp_ble_gattc_read_char something like that: if (ble_connection_is_ok()) { esp_ble_gattc_read_char(); } thanks!
by kxJiang
Tue Jul 04, 2017 7:52 am
Forum: General Discussion
Topic: what's the maximum BLE transfer speed beteen ESP32 and Nordic alike ble SOC
Replies: 1
Views: 7924

Re: what's the maximum BLE transfer speed beteen ESP32 and Nordic alike ble SOC

Besides lower the connection interval, I have to extend the packet length for BLE. Luckily, ESP32's bluetooth stack accepts the MTU size exchange request issued by NRF52, resulting 247bytes/packet.Now the transfer speed between ESP32 and NRF52 using ble is up to about 12k bytes/s(with packet parsing...
by kxJiang
Mon Jun 26, 2017 9:04 am
Forum: General Discussion
Topic: what's the bluetooth event task's priority
Replies: 4
Views: 10134

Re: what's the bluetooth event task's priority

Thanks for your advice, One more thing I want to know is that how can you retrieve the priority of bluetooth stack and wifi stack. Are there any reference manual available? I know the example in ESP's SDK treat the app_main as a FreeRTOS's task, what about the other module like bluetooth & wifi stac...
by kxJiang
Mon Jun 26, 2017 5:51 am
Forum: General Discussion
Topic: what's the maximum BLE transfer speed beteen ESP32 and Nordic alike ble SOC
Replies: 1
Views: 7924

what's the maximum BLE transfer speed beteen ESP32 and Nordic alike ble SOC

Is there any way to achieve maximum ble throughtput between ESP and NRF52832? I tried to change the connection interval, but the parameter was denied by ESP32, because the BLE stack of ESP32 return 0x3b which means CONN_INTERVAL_UNACCEPTABLE. Are there any docs describing the minimum connection inte...
by kxJiang
Mon Jun 19, 2017 3:17 am
Forum: General Discussion
Topic: what's the bluetooth event task's priority
Replies: 4
Views: 10134

what's the bluetooth event task's priority

what's the default bluetooth event task's priority? If I want to create a FreeRTOS task that it's priority is higher than bluetooh. I want to treat the data received from bluetooth's notify event as the producer, and a task that acts as a consumer. Is there a way to set this consumer task's priority...