healthrian_ble_support_for_p30

Healthrian BLE support library for the Hativ P30 ECG device, built on healthrian_ble_interface. It is a thin device-configuration layer: the generic ModuleBle / ModuleMonitor transport and streaming come from the interface; this package only supplies the P30's UUIDs, command framing, and packet parsing.

Device profile

• Scan filter: advertised name starts with Hativ.
• Channels: 6 — the device streams 2 physical leads (L1, L2) and the remaining four limb leads (L3, aVR, aVL, aVF) are derived. No precordial (V1–V6) leads.
• Sampling: 250 Hz, 20 samples per BLE notification (24-bit signed, big-endian, scaled to mV).
• Command framing: [0xBB, 0xCC, length, ...payload] (no CRC). ECG start = 0x10, stop = 0x11.
• Power-on: set mode BB CC 02 0A 01, then a BB CC 01 FF keep-alive every 2 s — the P30 sleeps without it. Declared as commands (setMode, powerOnMode, keepAlive, keepAliveInterval) and driven by ModuleBle.powerOn(), which registerCharacteristics runs on every connect. Consumers do not have to write these packets themselves.

Usage

import 'package:healthrian_ble_support_for_p30/healthrian_ble_support_for_p30.dart';

final manager = BLEManager(); // singleton

// Runs the P30 power-on sequence (set mode + 2 s keep-alive) on its own.
await manager.connectAndRegister(targetDevice: deviceId);
await manager.initializeStreams();
await manager.startMeasurement();

// 6-channel converted samples [channel][sample]
manager.ble.streams.ecg.meta.value?.listen((channels) {
  // channels[0]=L1, [1]=L2, [2]=L3, [3]=aVR, [4]=aVL, [5]=aVF
});

manager.ble.streams.ecg.meta.leadState?.listen((state) { /* electrode contact */ });

await manager.stopMeasurement();
await manager.disconnectDevice();