diff --git a/lora-ingest/.env.example b/lora-ingest/.env.example new file mode 100644 index 0000000..01d7d35 --- /dev/null +++ b/lora-ingest/.env.example @@ -0,0 +1,16 @@ +# ChirpStack gateway local IP (default port 1883) +CHIRPSTACK_MQTT_URL=mqtt://192.168.1.1:1883 + +# ChirpStack application UUID (Settings → Applications → copy ID) +CHIRPSTACK_APPLICATION_ID=your-application-uuid + +# AES-256-GCM app-layer key — MUST match APP_ENC_KEY_HEX in lora_node.py +# Generate: python3 -c "import secrets; print(secrets.token_hex(32))" +APP_ENC_KEY_HEX= + +# Shared secret for HMAC-SHA256 signing of requests to krobjob +# Generate: python3 -c "import secrets; print(secrets.token_hex(32))" +BASEFLOW_HMAC_KEY= + +# krobjob ingest endpoint (internal — not public) +KROBJOB_INGEST_URL=https://your-deployment.vercel.app/api/internal/lora-ingest diff --git a/lora-ingest/package-lock.json b/lora-ingest/package-lock.json new file mode 100644 index 0000000..9f9213e --- /dev/null +++ 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"^22.0.0", + "tsx": "^4.19.0", + "typescript": "^5.7.0" + } +} diff --git a/lora-ingest/src/decoder.ts b/lora-ingest/src/decoder.ts new file mode 100644 index 0000000..9885ed4 --- /dev/null +++ b/lora-ingest/src/decoder.ts @@ -0,0 +1,56 @@ +import { createDecipheriv } from 'crypto'; + +function requireHexKey(name: string, expectedBytes: number): Buffer { + const value = process.env[name]; + if (!value) throw new Error(`${name} is required`); + if (!/^[0-9a-fA-F]+$/.test(value)) throw new Error(`${name} must be hex`); + const buf = Buffer.from(value, 'hex'); + if (buf.length !== expectedBytes) throw new Error(`${name} must be exactly ${expectedBytes} bytes (got ${buf.length})`); + return buf; +} + +const APP_ENC_KEY = requireHexKey('APP_ENC_KEY_HEX', 32); + +export type DecodedEvent = + | { eventType: 'sale'; merchantId: number; amountMinor: number; queueDepth: number } + | { eventType: 'heartbeat'; merchantId: number; amountMinor: 0; queueDepth: number }; + +// AES-256-GCM envelope: [12-byte nonce][ciphertext][16-byte auth tag] +export function decryptPayload(base64Data: string): Buffer | null { + const raw = Buffer.from(base64Data, 'base64'); + if (raw.length < 12 + 1 + 16) return null; + + const nonce = raw.subarray(0, 12); + const tag = raw.subarray(raw.length - 16); + const ciphertext = raw.subarray(12, raw.length - 16); + + try { + const decipher = createDecipheriv('aes-256-gcm', APP_ENC_KEY, nonce); + decipher.setAuthTag(tag); + return Buffer.concat([decipher.update(ciphertext), decipher.final()]); + } catch { + return null; // auth tag mismatch — drop silently + } +} + +// fPort 1: struct.pack(">IHB", amount_minor, merchant_id, queue_depth) = 7 bytes +// fPort 2: struct.pack(">HB", merchant_id, queue_depth) = 3 bytes +export function decodeEvent(fPort: number, plaintext: Buffer): DecodedEvent | null { + if (fPort === 1 && plaintext.length === 7) { + return { + eventType: 'sale', + amountMinor: plaintext.readUInt32BE(0), + merchantId: plaintext.readUInt16BE(4), + queueDepth: plaintext.readUInt8(6), + }; + } + if (fPort === 2 && plaintext.length === 3) { + return { + eventType: 'heartbeat', + amountMinor: 0, + merchantId: plaintext.readUInt16BE(0), + queueDepth: plaintext.readUInt8(2), + }; + } + return null; +} diff --git a/lora-ingest/src/index.ts b/lora-ingest/src/index.ts new file mode 100644 index 0000000..0421f1a --- /dev/null +++ b/lora-ingest/src/index.ts @@ -0,0 +1,82 @@ +import mqtt from 'mqtt'; +import { decryptPayload, decodeEvent } from './decoder.js'; +import { relay, type RelayPayload } from './relay.js'; + +function requireEnv(name: string): string { + const value = process.env[name]; + if (!value) throw new Error(`${name} is required`); + return value; +} + +const CHIRPSTACK_MQTT_URL = requireEnv('CHIRPSTACK_MQTT_URL'); +const CHIRPSTACK_APP_ID = requireEnv('CHIRPSTACK_APPLICATION_ID'); + +async function relayWithRetry(payload: RelayPayload, attempts = 3): Promise { + let lastErr: unknown; + for (let i = 0; i < attempts; i++) { + try { + await relay(payload); + return; + } catch (err) { + lastErr = err; + if (i < attempts - 1) await new Promise((r) => setTimeout(r, 250 * 2 ** i)); + } + } + throw lastErr; +} + +const client = mqtt.connect(CHIRPSTACK_MQTT_URL, { + reconnectPeriod: 5000, +}); + +client.on('connect', () => { + const topic = `application/${CHIRPSTACK_APP_ID}/device/+/event/up`; + client.subscribe(topic, (err) => { + if (err) console.error('[lora-ingest] subscribe error:', err.message); + else console.log(`[lora-ingest] subscribed → ${topic}`); + }); +}); + +client.on('message', async (_topic, message) => { + let uplink: { + fPort?: number; + data?: string; + time?: string; + rxInfo?: Array<{ gatewayId?: string; rssi?: number; snr?: number }>; + }; + + try { + uplink = JSON.parse(message.toString()); + } catch { + return; + } + + const { fPort, data, rxInfo, time } = uplink; + if (!data || fPort == null) return; + + const plaintext = decryptPayload(data); + if (!plaintext) { + console.warn('[lora-ingest] decrypt failed (bad key or corrupt packet)'); + return; + } + + const event = decodeEvent(fPort, plaintext); + if (!event) return; + + const rx = rxInfo?.[0]; + try { + await relayWithRetry({ + ...event, + rssi: rx?.rssi ?? 0, + snr: rx?.snr ?? 0, + gatewayEui: rx?.gatewayId ?? '', + timestamp: time ?? new Date().toISOString(), + }); + } catch (err) { + console.error('[lora-ingest] relay error (all retries exhausted):', err); + } +}); + +client.on('error', (err) => console.error('[lora-ingest] MQTT error:', err.message)); +client.on('reconnect', () => console.log('[lora-ingest] reconnecting…')); +client.on('disconnect', () => console.log('[lora-ingest] disconnected')); diff --git a/lora-ingest/src/relay.ts b/lora-ingest/src/relay.ts new file mode 100644 index 0000000..0da1bc9 --- /dev/null +++ b/lora-ingest/src/relay.ts @@ -0,0 +1,41 @@ +import { createHmac } from 'crypto'; +import type { DecodedEvent } from './decoder.js'; + +function requireEnv(name: string): string { + const value = process.env[name]; + if (!value) throw new Error(`${name} is required`); + return value; +} + +const KROBJOB_INGEST_URL = (() => { + const value = requireEnv('KROBJOB_INGEST_URL'); + new URL(value); // throws if malformed + return value; +})(); +const BASEFLOW_HMAC_KEY = requireEnv('BASEFLOW_HMAC_KEY'); + +export type RelayPayload = DecodedEvent & { + rssi: number; + snr: number; + gatewayEui: string; + timestamp: string; +}; + +export async function relay(payload: RelayPayload): Promise { + const body = JSON.stringify(payload); + const sig = createHmac('sha256', BASEFLOW_HMAC_KEY).update(body).digest('hex'); + + const res = await fetch(KROBJOB_INGEST_URL, { + method: 'POST', + signal: AbortSignal.timeout(10_000), + headers: { + 'Content-Type': 'application/json', + 'X-Baseflow-Signature': sig, + }, + body, + }); + + if (!res.ok) { + throw new Error(`krobjob relay ${res.status}: ${await res.text()}`); + } +} diff --git a/lora-ingest/tsconfig.json b/lora-ingest/tsconfig.json new file mode 100644 index 0000000..a8d0c6e --- /dev/null +++ b/lora-ingest/tsconfig.json @@ -0,0 +1,12 @@ +{ + "compilerOptions": { + "target": "ES2022", + "module": "NodeNext", + "moduleResolution": "NodeNext", + "outDir": "dist", + "rootDir": "src", + "strict": true, + "esModuleInterop": true + }, + "include": ["src"] +}