如何从BLE设备的Arraybuffer中获取值读取特征值

Question

I have gone through doc of IONIC 2 whcih is https://ionicframework.com/docs/v2/native/ble/ . From there conversion of arraybuffer to string is given which is not working for me . As shown in image

How to get firmware version from this data from read characteristics as Arraybuffer conversion code of IONIC 2 which is: function bytesToString(buffer) { return String.fromCharCode.apply(null, new Uint8Array(buffer)); } function bytesToString(buffer) { return String.fromCharCode.apply(null, new Uint8Array(buffer)); } is not working for me. Using that code I am getting output: îÍy}ùt . I am new to ionic . I have Byte Transmission Order least significant octet first (ie, little endian). please provide me conversion solution. Thank you.

Answer 1

I am using bytesToString also and also got the value in ascii afterwards i did this:

var convertData = bytesToString(result);
var hexResult = [];

for (var i=0; i < convertData.length; i++){
   var resultNumber = convertData.charCodeAt(i);   //Dec
   var resultString = ("00" + (+resultNumber).toString(16)).substr(-2); //String
   hexResult[i] = "0x" + resultString;
}

I want hex so I did toString(16) . You can change accordingly and play around with this.

Let me know if this works!

Answer 2

我let data=new Uint8Array(buffer)同样的问题，但是我发现的简单解决方案是let data=new Uint8Array(buffer)现在在data您将获得数组中的所有值。