Search found 7 matches

by jhulbert
Tue Nov 23, 2021 3:09 am
Forum: ESP-IDF
Topic: ESP32 FreeRTOS - Posting to a queue from BLE GATT event handler
Replies: 1
Views: 2436

Re: ESP32 FreeRTOS - Posting to a queue from BLE GATT event handler

I think I've answered the first question. Some Espressif examples, such as ble_spp_server call xQueueSend() from the GATT event handler, so the xxxFromISR() versions are not necessary.

I'm still unsure about the second question - any suggestions?
by jhulbert
Wed Nov 17, 2021 4:04 am
Forum: ESP-IDF
Topic: ESP32 FreeRTOS - Posting to a queue from BLE GATT event handler
Replies: 1
Views: 2436

ESP32 FreeRTOS - Posting to a queue from BLE GATT event handler

I have an ESP32 running as a GATT server which receives 512 bytes of data at a time from the GATT client. I want to then transmit this data over UART. A pointer to the data gets posted to a FreeRTOS queue, which is received by my uart_tx_task. I am thinking the fastest way to do this would be to hav...
by jhulbert
Thu Jun 24, 2021 5:16 am
Forum: ESP-IDF
Topic: BLE error detection
Replies: 1
Views: 2407

BLE error detection

Hi I've read in a few places that the BLE spec requires a packet to be retransmitted if its checksum calculated at the receiver does not match the checksum sent by the transmitter i.e. error detection. I want to confirm whether this is true, and that the ESP32 BLE stack using Bluedroid implements th...
by jhulbert
Thu Jun 03, 2021 8:07 pm
Forum: General Discussion
Topic: OTA update using encrypted binary over HTTPS
Replies: 4
Views: 8860

Re: OTA update using encrypted binary over HTTPS

Replying for traction. I'm also interested in seeing an answer to this.
by jhulbert
Thu Apr 08, 2021 2:16 am
Forum: ESP-IDF
Topic: Where are characteristic values stored in ESP-IDF?
Replies: 0
Views: 1892

Where are characteristic values stored in ESP-IDF?

I was looking through the gatts_table_creat_demo.c example and I noticed in the attribute table all of the characteristic value entries in the table, the "value" field (i.e. esp_attr_desc_t.value) is a pointer to char_value[4] (a literal array of 8-bit hex values). This struck me as odd because I th...
by jhulbert
Wed Mar 31, 2021 12:54 am
Forum: General Discussion
Topic: BLE throughput from smartphone to ESP32
Replies: 0
Views: 2575

BLE throughput from smartphone to ESP32

I am beginning to plan a project using an ESP32-WROVER-E and would like to measure the BLE throughput. I am looking to do OTA over BLE. I have set up two ESP32's with the throughput client and server examples provided by Espressif. Both write and notify throughput report a data rate of ~91 kB/s whic...
by jhulbert
Thu Jan 28, 2021 10:12 pm
Forum: ESP-IDF
Topic: Does the ESP-IDF Bluetooth API use any hardware timers
Replies: 1
Views: 1831

Does the ESP-IDF Bluetooth API use any hardware timers

I am considering using an ESP32 for a new project. This project will require use of all four of the ESP32's hardware timers. I also want to use Bluetooth/BLE for this project using the ESP-IDF API. I am wanting to know if the API uses any of the hardware timers to implement the Bluetooth functions, ...