The WeChat applet outputs Chinese characters to the USB HID keyboard device through BLE low energy bluetooth (contains GBK encoding to convert Chinese characters)

foreword

Problem solved: output Chinese characters to USB HID devices through BLE low energy Bluetooth in WeChat applet

For example: To output the word "you" on the computer, you can do this:

Hold down Alt, enter 50403 on the keypad, and release Alt.

But USB HID device can only send like

A hexadecimal bytecode like 2C 08 A2 41 04 00 5D 00 00 00 00 00 . How to convert bytecode into corresponding Chinese characters?

In fact, it is not difficult, as long as you follow the prescribed format, but the difficulty lies in not knowing the prescribed format, such as what bytecode needs to be sent for what word.

Let's take a look at the steps. First, a Chinese character has an encoded format. Take the GBK encoding as an example. The GBK encoding of the word "you" represents 50403. After you get this 50403, you can use it on your computer or other When the device supports GBK encoding, press the Alt key to send, and then press 50403 in sequence (the Alt key cannot be released during the process), and then release the Alt key to output the word "you". The above is "a set of rules", and most people call this 50403 rule "internal code".

So for USB HID, it can also be sent to the computer through commands, and it corresponds to pressing a certain key, which is another set of "rules".

1. What is HID?

The HID (Human Interface Device) protocol is a sub-protocol in the USB protocol. Refers to devices that directly interact with humans.

HID is a common input device in life, such as keyboard, mouse, gamepad and so on. Most of the early HID devices were implemented through the USB interface. After the emergence of Bluetooth technology, wireless HID devices were realized through Bluetooth as the transport layer. The HID function implemented by Bluetooth Low Energy is generally referred to as HOGP (HID over Gatt Profile).

2. Rules for computer equipment

For example, input "hello"
and press Alt, input 50403 on the keypad, release Alt, input "you"
hold Alt, input 47811 on the keypad, release Alt, input "good"

Principle:
The GBK code of "you" is C4E3, ​​convert to decimal and input 50403.
If you are doing a HID keyboard, then send a code for pressing Alt, then send the data on the small keyboard in turn, and finally press Alt The key is lifted to complete the input of a word.

3. Rules for sending data by HID

Compared with the HID keyboard, if you want to press the number 5 on the keypad, the corresponding command sent is:

00 00 5d 00 00 00 00 00 Here is the explanation

byte 0	byte 1	byte 2	Byte 3	Byte 4	byte 5	byte 6	Byte 7
Rule 1	reserved bit	data bit	data bit	data bit	data bit	data bit	data bit
00	00	5d	00	00	00	00	00

Rule 1: (arranged from right to left)

bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Right GUI	Right Alt	Right Shift	Right Control	eft GUI	Left Alt	Left Shift	Left Control

Pressed is 1

---

For example, to press the Left Alt key, that is 00000100 = 4

The bytes sent together, if you press 5, it is 00 00 93 00 00 00 00 00 (because 5d is hexadecimal, it is 93 when converted to decimal)

The bytes sent together, if you press Alt + 5, it is 04 00 93 00 00 00 00 00

The bytes sent together, if you press Alt + 5 + 6, it is 04 00 93 94 00 00 00 00 (the number 6 on the keypad corresponds to the HID keyboard is 5E, and the corresponding decimal is 94)

If you want to release all the keys is 00 00 00 00 00 00 00 00

Limitations: Only six keys can be pressed to send a request (not counting the function keys such as Alt)

If you want to press Alt+5, only lift 5, then press 6, and finally release all keys, you can send it like this:

04 00 93 00 00 00 00 00

04 00 94 00 00 00 00 00

00 00 00 00 00 00 00 00

The above is the basic HID data format. However, USB Bluetooth device manufacturers often do not use it directly. First, the efficiency is too slow. One request is required to send a word (a request usually takes about 300ms). The second is that it is not just about transmitting text, or there is a need for image transmission. Therefore, generally speaking, manufacturers generally encapsulate their own data transmission protocols on this basis. That is, the circuit board corresponds to a specific USB protocol (this passage is the blogger's own understanding, if there is any inappropriate understanding, please correct it in the comment area.)

4. Demand

Make a WeChat applet that can send Chinese characters to the computer and display them.

Existing devices: BLE2USBHID device, original WeChat applet. But you can’t send Chinese characters, you can only send English lowercase letters and numbers, and you can only send up to 13 characters at a time.

Now the requirement is to develop on the original WeChat applet and be able to send Chinese characters.

Result: It is done, and Chinese characters can be sent. All GBK-encoded characters can be sent, but there will be efficiency problems. The fastest is 300ms per character, and the slowest is 2400ms per character.

Manufacturer's information (including applet source code download):
https://note.youdao.com/ynoteshare/index.html

5. Realize

Reference materials given by the original manufacturer: https://github.com/lerpo/bluethooth

Step 1: Get the \utils\gbk.js file from the above information (you can also get it yourself below), and put it in the project utils\gbkUtil\gbk.js;

Step 2: Create a utils\gbkUtil\gbkUtil.js file, which is a tool file for calling GBK, which is conducive to decoupling.

Step 3: Use gbkUtil.js to use the tool file

GBK tool code

gbk.js file

/**/ /**/ /**/ /**/ /**/ /**/
/*  
**  ==================================================================================================  
**  类名：J.gbk
**	版本：1.0
**  功能：URLEncode,URLDecode
**  示例：  
    ---------------------------------------------------------------------------------------------------  
	
		用法：参见组件地址
		
    ---------------------------------------------------------------------------------------------------  
**  创建：2011/09/15
**  更新：2011/09/16
**	组件地址： http://www.vuln.cn/2901 
**  ==================================================================================================  
**/
var U2Ghash;
var G2Uhash;

function data() {
    
    
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641667b,758b80e576:b2b4,77dc80:1214161c20222526272928310b3543464d526971,898398:788083,99:fafbfcfdfeff,9a:000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738#393a3b3c3d3e3f404142434445464748494a4b4c4d4e4f50515253545556575859,98:898c8d8f949a9b9e9fa1a2a5a6,86:4d546c6e7f7a7c7ba88d8bac9da7a3aa93a9b6c4b5ceb0bab1afc9cfb4e9f1f2edf3d0,871386:def4dfd8d1,87:0307,86f887:080a0d09233b1e252e1a3e48343129373f82227d7e7b60704c6e8b53637c64596593afa8d2,9a:5a5b5c5d5e5f606162636465666768696a6b7283898d8e949599a6a9aaabacadaeafb2b3b4b5b9bbbdbebfc3c4c6c7c8c9cacdcecfd0d2d4d5d6d7d9dadbdc#dddee0e2e3e4e5e7e8e9eaeceef0f1f2f3f4f5f6f7f8fafcfdfeff,9b:000102040506,87:c68885ad9783abe5acb5b3cbd3bdd1c0cadbeae0ee,88:1613,87fe88:0a1b21393c,7f:36424445,82107a:fafd,7b:080304150a2b0f47382a192e31202524333e1e585a45754c5d606e7b62727190a6a7b8ac9da885aa9ca2abb4d1c1ccdddae5e6ea,7c0c7b:fefc,7c:0f160b,9b:07090a0b0c0d0e1011121415161718191a1b1c1d1e2021222425262728292a2b2c2d2e3031333435363738393a3d3e3f40464a4b4c4e50525355565758595a#5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b,7c:1f2a26384140,81fe82:010204,81ec884482:2122232d2f282b383b33343e44494b4f5a5f68,88:7e8588d8df,895e7f:9d9fa7afb0b2,7c7c65497c:919d9c9ea2b2bcbdc1c7cccdc8c5d7e8,826e66a87f:bfced5e5e1e6e9eef3,7cf87d:77a6ae,7e:479b,9e:b8b4,8d:73849491b1676d,8c:4749,91:4a504e4f64,9b:7c7d7e7f808182838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9ba#bbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadb,91:626170696f7d7e7274798c85908d91a2a3aaadaeafb5b4ba,8c559e7e8d:b8eb,8e:055969,8d:b5bfbcbac4d6d7dadececfdbc6ecf7f8e3f9fbe4,8e098dfd8e:141d1f2c2e232f3a4039353d3149414251524a70767c6f74858f94909c9e,8c:78828a859894,659b89:d6dedadc,9b:dcdddedfe0e1e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff,9c:000102030405060708090a0b0c0d0e0f101112131415161718191a#1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b,89:e5ebef,8a3e8b26975396:e9f3ef,97:0601080f0e2a2d303e,9f:808385868788898a8c,9efe9f:0b0d,96:b9bcbdced2,77bf96e092:8eaec8,93:3e6aca8f,94:3e6b,9c:7f8285868788,7a239c:8b8e90919294959a9b9e9fa0a1a2a3a5a6a7a8a9abadaeb0b1b2b3b4b5b6b7babbbcbdc4c5c6c7cacb3c3d3e3f404142434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a#7b7d7e808384898a8c8f93969798999daaacafb9bebfc0c1c2c8c9d1d2dadbe0e1cccdcecfd0d3d4d5d7d8d9dcdddfe2,97:7c85919294afaba3b2b4,9a:b1b0b7,9e589a:b6babcc1c0c5c2cbccd1,9b:45434749484d51,98e899:0d2e5554,9a:dfe1e6efebfbedf9,9b:080f131f23,9e:bdbe,7e3b9e:8287888b92,93d69e:9d9fdbdcdde0dfe2e9e7e5eaef,9f:222c2f39373d3e44,9c:e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff,9d:000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f2021#22232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f404142#92$434445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778797a7b7c7d7e7f8081#82838485868788898a8b8c8d8e8f909192939495969798999a9b9c9d9e9fa0a1a2#92$a3a4a5a6a7a8a9aaabacadaeafb0b1b2b3b4b5b6b7b8b9babbbcbdbebfc0c1c2c3c4c5c6c7c8c9cacbcccdcecfd0d1d2d3d4d5d6d7d8d9dadbdcdddedfe0e1#e2e3e4e5e6e7e8e9eaebecedeeeff0f1f2f3f4f5f6f7f8f9fafbfcfdfeff,9e:000102#92$030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e24272e30343b3c404d5052535456595d5f606162656e6f727475767778797a7b7c7d80#8183848586898a8c8d8e8f90919495969798999a9b9c9ea0a1a2a3a4a5a7a8a9aa#92$abacadaeafb0b1b2b3b5b6b7b9babcbfc0c1c2c3c5c6c7c8cacbccd0d2d3d5d6d7d9dadee1e3e4e6e8ebecedeef0f1f2f3f4f5f6f7f8fafdff,9f:000102030405#060708090a0c0f1112141516181a1b1c1d1e1f21232425262728292a2b2d2e3031#92$3233343536383a3c3f4041424345464748494a4b4c4d4e4f52535455565758595a5b5c5d5e5f606162636465666768696a6b6c6d6e6f707172737475767778#797a7b7c7d7e81828d8e8f9091929394959697989c9d9ea1a2a3a4a5,f9:2c7995e7f1#92$,fa:0c0d0e0f111314181f20212324272829,e8:15161718191a1b1c1d1e1f202122232425262728292a2b2c2d2e2f303132333435363738393a3b3c3d3e3f40414243#4445464748494a4b4c4d4e4f505152535455565758595a5b5c5d5e5f6061626364'
    .replace(/#(\d+)\$/g, function(a, b) {
    
    
      return Array(+b + 3).join('#');
    })
    .replace(/#/g, '####')
    .replace(/(\w\w):([\w#]+)(?:,|$)/g, function(a, hd, dt) {
    
    
      return dt.replace(/../g, function(a) {
    
    
        if (a != '##') {
    
    
          return hd + a;
        } else {
    
    
          return a;
        }
      });
    });
  U2Ghash = {
    
    },
  G2Uhash = {
    
    };
  return re;
}

function initUsChash(data) {
    
    
  var k = 0;
  data = data.match(/..../g);
  for (var i = 0x81; i <= 0xfe; i++) {
    
    
    for (var j = 0x40; j <= 0xFE; j++) {
    
    
      U2Ghash[data[k++]] = ('%' + i.toString(16) + '%' + j.toString(16))
        .toUpperCase();
    }
  }
  for (var key in U2Ghash) {
    
    
    G2Uhash[U2Ghash[key]] = key;
  }
}

function isAscii(unicode) {
    
    
  return ((unicode == 0x20AC) || (unicode <= 0x007F && unicode >= 0x0000));
}

function encode(str) {
    
    
  if (U2Ghash == undefined) {
    
    
    initUsChash(data());
  }
  return str.replace(/./g, function(a) {
    
    
    var code = a.charCodeAt(0);
    if (isAscii(code)) {
    
    
      return encodeURIComponent(a);
    } else {
    
    
      var key = code.toString(16);
      if (key.length != 4) key = ('000' + key).match(/....$/)[0];
      return U2Ghash[key] || a;
    }
  });
}

function decode(str) {
    
    
  return str.replace(/%[0-9A-F]{2}%[0-9A-F]{2}/g, function(a) {
    
    
    if (a in G2Uhash) {
    
    
      return String.fromCharCode('0x' + G2Uhash[a]);
    } else {
    
    
      return a;
    }
  }).replace(/%[\w]{2}/g, function(a) {
    
    
    return decodeURIComponent(a);

  });
}

module.exports = {
    
    
  encode: encode,
}

gbkUtil.js file

// gbk转换工具
const gbk = require('./gbk.js');

/**中文字符串转为GBK对应的十进制编码 */
const hexStringToBuff = str => {
    
     //str='中国：WXHSH'
    const buffer = new Array();
    var data = str.toString();
    let dataPara
    for (let i = 0; i < data.length; i++) {
    
    
        if (data.charCodeAt(i) < 128) {
    
     //如果是英文
            //英文GBK十进制
            dataPara = data[i].charCodeAt(0);
            buffer.push(dataPara);
        } else {
    
    
            //调用GBK 转码
            let t = gbk.encode(data[i]);
            //中文GBK十进制
            dataPara = parseInt(String(t).replace(/%/g, ''), 16); // “你” 的GBK编码是 %C4%E3 变成 C4E3 再转换成 50403
            buffer.push(dataPara);
        }
        console.log(data[i] + " 对应的编码===> "+ dataPara);
    }
    return buffer;
}

function toUnicode(s) {
    
    
    var str = "";
    for (var i = 0; i < s.length; i++) {
    
    
        str += "\\u" + s.charCodeAt(i).toString(16) + "\t";
    }
    return str;
}

function strToHexCharCode(str) {
    
    
    if (str === "")
        return "";
    var hexCharCode = [];
    hexCharCode.push("0x");
    for (var i = 0; i < str.length; i++) {
    
    
        hexCharCode.push((str.charCodeAt(i)).toString(16));
    }
    return hexCharCode.join("");
}

// 计算长度，中文占两个字节，其他字符占一个字节
function sumStrLength(str) {
    
    
    var length = 0;
    var data = str.toString();
    for (var i = 0; i < data.length; i++) {
    
    
        if (isCN(data[i])) {
    
     //是中文
            length += 2;
        } else {
    
    
            length += 1;
        }
    }
    return length;
}

//判断是否是中文，是，true
function isCN(str) {
    
    
    if (/^[\u3220-\uFA29]+$/.test(str)) {
    
    
        return true;
    } else {
    
    
        return false;
    }
}

//汉字转码
function hexStringToArrayBuffer(str) {
    
    
    const buffer = new ArrayBuffer((str.length / 2) + 1)
    const dataView = new DataView(buffer)
    for (var i = 0; i < str.length / 2; i++) {
    
    
        var temp = parseInt(str[i * 2] + str[i * 2 + 1], 16)
        dataView.setUint8(i, temp)
    }
    dataView.setUint8((str.length / 2), 0x0a)
    return buffer;
}

//返回八位数组
function subString(str) {
    
    
    var arr = [];
    if (str.length > 8) {
    
     //大于8
        for (var i = 0;
            (i * 8) < str.length; i++) {
    
    
            var temp = str.substring(i * 8, 8 * i + 8);
            arr.push(temp)
        }
        return arr;
    } else {
    
    
        return str
    }
}

//不带有汉字
function hexStringToArrayBufferstr(str) {
    
    
    let val = ""
    for (let i = 0; i < str.length; i++) {
    
    
        if (val === '') {
    
    
            val = str.charCodeAt(i).toString(16)
        } else {
    
    
            val += ',' + str.charCodeAt(i).toString(16)
        }
    }
    val += "," + "0x0a";
    console.log(val)
    // 将16进制转化为ArrayBuffer
    return new Uint8Array(val.match(/[\da-f]{2}/gi).map(function (h) {
    
    
        return parseInt(h, 16)
    })).buffer
}

module.exports = {
    
    
    // 汉字转换为GBK编码
    hexStringToArrayBuffer: hexStringToArrayBuffer,
    hexStringToBuff: hexStringToBuff,
}

How to use: use in index.js file

const gbk = require("../../utils/gbkUtil/gbkUtil");
Page({
    
    
    // 测试案例
     test() {
    
    
         let str = '你好';
         // 调用这个hexStringToBuff方法 返回一个整数数组 
         let ArrayBuffer = gbk.hexStringToBuff(str); 
         console.log("对应GBK编码：", ArrayBuffer);	// 对应GBK编码：[50403,47811]
    },
})

6. USB manufacturer's own protocol

sending method one

In the small program provided by the manufacturer, it is found that it is not just the HID protocol, but another protocol is established on this basis, please see the following code:

   //第一字节01代表键盘 第二字节代表数据长度8字节  第三字节开始是HID数据（键盘是8字节）
    bindViewSend: function () {
    
    
        that.sendData("01 08 00 00 00 00 00 00 00 00");
        that.sendData("01 08 00 00 00 00 00 00 00 00");
    },

There are a total of 10 bytes. The first two are the protocol data regulations added by the manufacturer. I don’t know what the other numbers in these two bytes represent. If anyone knows, please give me some pointers in the comment area. Thank you.

The above is the data sent by bytecode, which needs to be realized by referring to the HID keyboard code, and the efficiency is not high, only 16 bytes of data can be sent. Here are the use cases:

Send a word "you":

It can be sent like this, case 1

        this.sendData("01 08 04 00 5d 00 00 00 00 00"); // 按住Alt键,输入 5      
        this.sendData("01 08 04 00 00 00 00 00 00 00"); // 按住Alt键,释放数字键
        this.sendData("01 08 04 00 62 00 00 00 00 00"); // 按住Alt键,输入 0
        this.sendData("01 08 04 00 00 00 00 00 00 00"); // 按住Alt键,释放数字键
        this.sendData("01 08 04 00 5c 00 00 00 00 00"); // 按住Alt键,输入 4
        this.sendData("01 08 04 00 00 00 00 00 00 00"); // 按住Alt键,释放数字键
        this.sendData("01 08 04 00 62 00 00 00 00 00"); // 按住Alt键,输入 0
        this.sendData("01 08 04 00 00 00 00 00 00 00"); // 按住Alt键,释放数字键
        this.sendData("01 08 04 00 5b 00 00 00 00 00"); // 按住Alt键,输入 3
        this.sendData("01 08 00 00 00 00 00 00 00 00"); // 释放Alt键

It can also be sent like this, case 2

        this.sendData("01 08 04 00 5d 00 00 00 00 00"); // 按住Alt键,输入 5      
        this.sendData("01 08 04 00 62 00 00 00 00 00"); // 按住Alt键,输入 0	(会自动释放上一个键，注意：按下另外一个不同键的时候才会这样，例如上一个键是5，另外一个键是0)
        this.sendData("01 08 04 00 5c 00 00 00 00 00"); // 按住Alt键,输入 4
        this.sendData("01 08 04 00 62 00 00 00 00 00"); // 按住Alt键,输入 0
        this.sendData("01 08 04 00 5b 00 00 00 00 00"); // 按住Alt键,输入 3
        this.sendData("01 08 00 00 00 00 00 00 00 00"); // 释放Alt键

It can also be sent like this, case 3

        this.sendData("01 08 04 00 5d 62 5c 62 5b 00"); // 按住Alt键,输入50403（你）
        this.sendData("01 08 00 00 00 00 00 00 00 00"); // 释放Alt键

Among the above cases, the most ideal case is case 1, which can completely realize the writing of all Chinese characters, but it takes 10 requests to send a Chinese character, and each request takes 300ms, which means that a Chinese character will not come out until 3 seconds later. , which is too slow, so you can use case 2 and case 3, but please pay attention!

Case 2 or Case 3 will have a large part of the Chinese characters that cannot be output, such as the word "good" (47811), the last two "1", according to this writing method, the button is not lifted, that is, In fact, you simulated pressing 1 twice, but did not lift it once, which is equivalent to pressing the number 1 once (understandable), so the Chinese characters will not come out (4781 means nothing).

Send method two

Because the above sending method is either too slow or incomplete, even if case 3 is feasible, it still takes 300ms for a word, and an 800-word article needs to wait for 240s, that is, about four minutes to finish sending, which is too slow. So the manufacturer has another set of agreements:

Specifies to send a string:

K:+ the content you want to send

For example, to send abc123, it is enough to call the manufacturer's original method (this.stringToBytes()).

let str = 'K:' + 'abc123';
this.blesend(this.stringToBytes(str));

Advantages: 13 characters can be sent in one request, it only takes 300ms, and the efficiency is 13 times that of method 1!

Limitations: A request can send up to 13 characters (a data packet can send 16 bytes, but K: occupies two, there should be 14 bytes, but I don’t know why the last one will be lost, so insurance It is 13 characters), and it can only send English lowercase and numbers. If it is sent in English uppercase, it will be automatically converted to English lowercase. If it is sent in Chinese, it will take the remainder of 255 and output the corresponding ASCII code character.

7. Summary:

Method 1 can realize the output of Chinese characters, but the transmission efficiency is low, and it will be optimized later (the original interface conforms to English lowercase and numbers, if there are no adjacent characters with the same number, use case 3, and the rest use case 1), so It will only be partially optimized, and the time is still very long.

The second method is more efficient, but it does not meet the requirements. The disadvantage is obvious. Only lowercase letters and numbers can be sent.

Things that can be optimized: Since the USB board belongs to the manufacturer, the code of our own machine can be changed, and we can use our own protocol on the manufacturer's HID protocol. For example, send the GBK code of each character to the past, and then It's much faster to parse it yourself.

It can be like this: the decimal corresponding to the word "you" is 50403, and the hexadecimal is c4e3, which occupies two bytes, and a total of 16 bytes can be sent, that is to say, 8 characters can be sent at a time, which takes time 300ms, this speed seems to be not ideal, but it is relatively good at present.

Tried but failed: Modify the MTU value of the applet to 63. The modification is successful, but when sending more than 16 bytes, an error will still be reported:

{
    
    errno: 1500104, errCode: 10008, errMsg: "writeBLECharacteristicValue:fail:system error"}

There is no way for the time being, it should be that the manufacturer's USB device can accept an upper limit of 16 bytes.

8. Reference materials

https://www.fileformat.info/tip/microsoft/enter_unicode.htm

Code for the whole project:

https://gitee.com/zzuli_huahua/BLEUSB2HID

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END！

The above are the opinions of this project. Although the problem of Chinese characters is solved, there will still be speed problems. If you have good suggestions and supplements, please leave your valuable comments!