The flutter_esp32_ble_ota's intro from kattaliraees

flutter_esp32_ble_ota's Introduction

Flutter App & esp-idf sample for performing ESP32 OTA via BLE

1MB OTA update time, iPhone SE 2, iOS 15 ---> 2 Minutes and 15 Seconds

How it works

One BLE Service with a Read, Write & Notify GATT Characteristic is created in ESP32 firmware.
Read of CHAR will return the current running firmware version
OTA update starts with a 5 bytes header packet
5 Bytes [StartKey, OTASizeMSB, OTASizeByte, OTASizeByte, OTASizeLSB]
Following the header bytes, OTA bin file bytes will get written to ble characteristics as batches of 514 bytes
ESP32 firmware append this bytes to ota.bin file in SD Card
At the end send the OTA End Key to inform firmware OTA file sending finished
Firmware will verify the size with header bytes and total bytes received
If file size match, it will begin OTA process at firmware side

Tested on

boot: ESP-IDF v4.4-dev-2594-ga20df743f1 2nd stage bootloader
boot: compile time 21:09:21  
boot: chip revision: 3  
boot_comm: chip revision: 3, min. bootloader chip revision: 0  
boot.esp32: SPI Speed      : 40MHz  
boot.esp32: SPI Mode       : DIO  
boot.esp32: SPI Flash Size : 8MB

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