HarmonyOS 鸿蒙Next 蓝牙指令转换

若得到的Uint8Array数据为array，需要构建出的蓝牙指令为command，参考以下Demo：

command (){

 let array = new Uint8Array([1,2,3,4]);

 let length = array.length

 let lengthArray = this.decToHexBytes(length)

 let command = new Uint8Array(length + 7)

 command[0] = 0xAA // 固定头部 1个字节

 command[1] = 0xAA // 固定头部 1个字节

 command[2] = 10 //指令(Control-Type) 1个字节

 command[3] = lengthArray[0]//*数据体长度 第一个字节

 command[4] = lengthArray[1] //*数据体长度 第二个字节

 for (let index = 0; index < array.length; index++) {

   command[index+5] = array[index];//数据体command Data

 }

 command[length+5] = 10 // CRC 1个字节

 command[length+6] = 0xAA // 固定头部 1个字节

 return command

}

decToHexBytes(decNum:number) {

 let hexStr = decNum.toString(16)

 let hexNum = parseInt(hexStr, 16)

 let highByte = (hexNum >> 8) & 0xff

 let lowByte = hexNum & 0xff

 return [lowByte, highByte]

}