Aifer

Most recent activity

• Does Espruino support SPIFFS file system now on ESP8266/ESP32 ?

  @Aifer started

  • 10 comments
  • 7,076 views

  @barbiani replied
• Will Espruino support FFI(libffi)

  @Aifer started

  • 2 comments
  • 2,211 views

  @Gordon replied
• Will Espruino support FFI(libffi)

  in JavaScript • 7 years, 8 months

  

  Some times we need c functions, and jswrap method needs rewrite the c module less or more. FFI?

• How to fast the data transfer rate with WebSocket module 'ws' in Espruino?

  @Aifer started

  • 18 comments
  • 12,928 views

  @Gordon replied
• How to get response data by socket connections in native C code?

  in ESP32 • 7 years, 9 months

  

  Hi, @Gordon

  I try you suggestion, result is here:

  http://forum.espruino.com/conversations/302083/#comment13541177

  Thanks!

• How to get response data by socket connections in native C code?

  @Aifer started

  • 6 comments
  • 3,101 views

  @Aifer replied
• How to fast the data transfer rate with WebSocket module 'ws' in Espruino?

  in ESP32 • 7 years, 9 months

  

  Hi, @Gordon

  You are right!

  Follow your suggestion, I write the "C" native Mask library for websocket module on Espruino.
  On Esp32 module, I test the library for some times.
  Without Mask-lib, It takes about 64 seconds to transfer 23KB data to a websocket server.
  By using Mask-lib, It takes about 1.68 second to do the same work.
  Mask-lib can improve the performance of 'ws' about 40 times.

  All codes are here:

  jswrap_mask.h

  [#include](https://forum.espruino.com/search/?q=%23include) "jsvar.h"
  
  JsVar *jswrap_mask_4(JsVar *str);
  

  jswrap_mask.c

  [#include](https://forum.espruino.com/search/?q=%23include) "jswrap_mask.h"
  [#include](https://forum.espruino.com/search/?q=%23include) "jsinteractive.h"
  [#include](https://forum.espruino.com/search/?q=%23include) "jsvar.h"
  [#include](https://forum.espruino.com/search/?q=%23include) "jshardware.h"
  
  // Define the JavaScript class
  /*JSON{
    "type" : "class",
    "class" : "M"
  }*/
  
  // Define the `jswrap_mask_4` to be a `staticmethod` on the `M` class
  /*JSON{
    "type" : "staticmethod",
    "class" : "M",
    "name" : "mask4",
    "generate" : "jswrap_mask_4",
    "params" : [
      ["str","JsVar","An object containing a string"]
    ],
    "return" : ["JsVar","Returns a masked string object"]
  }
  Create a masked string, mask is 4 random chars.
  */
  JsVar *jswrap_mask_4(JsVar *str) {
    if (!jsvIsString(str)) {
      return jsvNewFromEmptyString();
    }
    size_t msglength = jsvGetStringLength(str);
    char *masked = (char *)jsvMalloc(msglength+1);
    jsvGetString(str, masked, msglength+1);
    //jsvUnLock(str); // crash?
    char mask[4] = {0,0,0,0};
  	//String masked = message; //jsvgetstring
  	for (int i = 0; i < 4; i++)
  	{
      char a = (char)jshGetRandomNumber();
      mask[i] = a;
  	}
  	for (int i = 0; i < msglength; i++){
      masked[i] ^= mask[i % 4];
    }
    JsVar *maskedVar = jsvNewFromEmptyString();
    jsvAppendStringBuf(maskedVar, mask, 4);
    jsvAppendStringBuf(maskedVar, masked, msglength);
    jsvFree(masked);
    return maskedVar;
  }
  

  Change in ws.js

  /** Send message based on opcode type */
  WebSocket.prototype.send = function (msg, opcode) {
    opcode = opcode === undefined ? 0x81 : opcode;
    var size = msg.length;
    if (msg.length>125) {
      size = 126;
    }
    this.socket.write(strChr(opcode, size + ( this.masking ? 128 : 0 )));
  
    if (size == 126) {
      // Need to write extra bytes for longer messages
      this.socket.write(strChr(msg.length >> 8));
      this.socket.write(strChr(msg.length));
    }
  
    if (this.masking) { // change is here
      this.socket.write(M.mask4(msg)); // using built-in lib instead of JS masking codes 
    } else {
      this.socket.write(msg);
    }
  };
  

  Espruino is flexible, Cool!

• How to get response data by socket connections in native C code?

  in ESP32 • 7 years, 9 months

  

  @Gordon
  Good idea!
  Let me try. ;-)

• How to get response data by socket connections in native C code?

  in ESP32 • 7 years, 9 months

  

  @Gordon
  The JS module 'ws' is some slow in my code, so I want to write a C native 'ws' built-in module.

• How to use a native C function as callback function in jswrap functions?

  @Aifer started

  • 5 comments
  • 2,830 views

  @Aifer replied