feat: init duooomi BLE SDK with brownfield support

ble/services/FileTransferService.ts

@@ -0,0 +1,49 @@
+import { type APP_COMMAND_TYPES } from '../protocol/Constants'
+import { BleProtocolService } from './BleProtocolService'
+
+export class FileTransferService {
+  private static instance: FileTransferService
+  private protocol = BleProtocolService.getInstance()
+
+  private constructor() {}
+
+  public static getInstance(): FileTransferService {
+    if (!FileTransferService.instance) {
+      FileTransferService.instance = new FileTransferService()
+    }
+    return FileTransferService.instance
+  }
+
+  public async transferFile(
+    deviceId: string,
+    file: string | ArrayBuffer,
+    type: APP_COMMAND_TYPES,
+    onProgress?: (progress: number) => void,
+  ): Promise<void> {
+    try {
+      const startAt = Date.now()
+      let arrayBuffer: ArrayBuffer
+      if (file instanceof ArrayBuffer) {
+        arrayBuffer = file
+      } else {
+        const response = await fetch(file)
+        if (!response.ok) {
+          throw new Error(`Failed to load file: ${response.statusText}`)
+        }
+        const blob = await response.blob()
+        const reader = new FileReader()
+        arrayBuffer = await new Promise<ArrayBuffer>((resolve, reject) => {
+          reader.onload = () => resolve(reader.result as ArrayBuffer)
+          reader.onerror = reject
+          reader.readAsArrayBuffer(blob)
+        })
+      }
+      await this.protocol.send(deviceId, type, arrayBuffer, onProgress)
+      const transferredAt = Date.now()
+      console.debug(`File transferred in ${(transferredAt - startAt) / 1000} s`)
+    } catch (e) {
+      console.error('File transfer failed', e)
+      throw e
+    }
+  }
+}