Bluetooth BLE Read/Write Architecture

Kernel
1

Hello,

I am currently developing a Bluetooth BLE application for Espressif’s ESP32-S3 and looking for some help in regards to setting up the read/write architecture with FreeRTOS. I am encountering issues when trying to subscribing to read and write notifications. My applications runs sequentially and fails when trying to run a read and write (e.g., GATT procedure read and subscribe initiated → GATT procedure write initiated → read complete → write complete → subscription failed, connection terminates). I believe I will need to implement a way of blocking the execution of my program until a read or write operation is completed. What would be the best approach for this using FreeRTOS? I was looking into possibly using Task Notifications or Event Groups but if anyone has worked with Bluetooth BLE before any help would be appreciated.

Thanks!

2

Hi Kevin,

Welcome to the FreeRTOS community.
A good example will be to look at the FreeRTOS-plus-TCP library (GitHub - FreeRTOS/FreeRTOS-Plus-TCP: FreeRTOS-Plus-TCP library repository. +TCP files only. Submoduled into https://github.com/FreeRTOS/FreeRTOS and various other repos.), especially the receive part of it.
In receive there is an ip-task(prvIPTask) which is always waiting to be signaled by the portable layer(ethernet interface) to receive the data.

Infact, you can use the FreeRTOS-plus-TCP library and just replace the portable layer (FreeRTOS-Plus-TCP/source/portable at main · FreeRTOS/FreeRTOS-Plus-TCP · GitHub) to have “Bluetooth Network Interface read/write” instead of the existing ethernet interface while keeping the “NetworkInterface” APIs unchanged.

3

Hello Shub,

Thank you for your response, I will take a look into this.