BLE OTA/DFU host example?

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yilic_1856906
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I am writing an BLE mcu-to -mcu project, the module is CYBLE-222014

I want to develop an OTA function that BLE deviceA receive update-firmware from PC through UART,

then deviceA send the firmware file to BLE deviceB via BLE and complete the OTA procedure.

The question is, I cannot find any information about the host device in mcu-base device. (I know there are source code of andriod and IOS )

All document is about deviceB, the one which updated firmware.

I wonder if there is any example or any resources for the host device of OTA?

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