Add BLE stream classes.#1068

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Commits on Nov 24, 2025

Add BLE stream classes.
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Commits on Jan 11, 2026

Commits on Jan 13, 2026

Commits on Jan 15, 2026

Improve data handling with buffer/offset tracking, add flush timeout
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Add stream-class examples: NimBLE_Stream_Server, NimBLE_Stream_Client, and NimBLE_Stream_Echo

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