Show HN: Proximity BLE Chat – connectionless chat using BLE advertisements

Category: library

Tags: ble, offline-messaging, proximity-chat

Score: 6.3/10 (Innovation: 7, Technical: 7, Documentation: 6, Utility: 5)

PBLEC is a connectionless BLE chat app that broadcasts messages via Bluetooth Low Energy advertisements, enabling proximity-based chat without pairing or internet. It is interesting for its clever use of limited BLE advertisement space (26 bytes for UTF-8 messages) and an iBeacon-based notification system to wake the app in the background, addressing real-world constraints of offline communication.

Target audience: mobile developers

Repository: https://vetch.pages.dev/blog/pblec/

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