updated puck.js lib

Author: gfwilliams

Diff for: js/puck.js

@@ -1,7 +1,8 @@
 /*
 --------------------------------------------------------------------
-Puck.js BLE Interface library
-                      Copyright 2020 Gordon Williams ([email protected])
+Puck.js BLE Interface library for Nordic UART
+                      Copyright 2021 Gordon Williams ([email protected])
+                      https://github.com/espruino/EspruinoWebTools
 --------------------------------------------------------------------
 This Source Code Form is subject to the terms of the Mozilla Public
 License, v. 2.0. If a copy of the MPL was not distributed with this
@@ -47,6 +48,13 @@ Or more advanced usage with control of the connection
     });
   });
 
+ChangeLog:
+
+...
+1v00 : Added Promises to write/eval
+1v01 : Raise default Chunk Size to 20
+       Auto-adjust chunk size up if we receive >20 bytes in a packet
+
 */
 (function (root, factory) {
     if (typeof define === 'function' && define.amd) {
@@ -88,15 +96,15 @@ Or more advanced usage with control of the connection
         window.location = "https://itunes.apple.com/us/app/webble/id1193531073";
     } else {
       if (confirm("This Web Browser doesn't support Web Bluetooth.\nPlease click Ok to see instructions for enabling it."))
-        window.location = "https://www.espruino.com/Puck.js+Quick+Start";
+        window.location = "https://www.espruino.com/Quick+Start+BLE#with-web-bluetooth";
     }
     return false;
   }
 
   var NORDIC_SERVICE = "6e400001-b5a3-f393-e0a9-e50e24dcca9e";
   var NORDIC_TX = "6e400002-b5a3-f393-e0a9-e50e24dcca9e";
   var NORDIC_RX = "6e400003-b5a3-f393-e0a9-e50e24dcca9e";
-  var CHUNKSIZE = 16;
+  var DEFAULT_CHUNKSIZE = 20;
 
   function log(level, s) {
     if (puck.log) puck.log(level, s);
@@ -140,6 +148,7 @@ Or more advanced usage with control of the connection
     var rxCharacteristic;
     var txDataQueue = [];
     var flowControlXOFF = false;
+    var chunkSize = DEFAULT_CHUNKSIZE;
 
     connection.close = function() {
       connection.isOpening = false;
@@ -154,6 +163,7 @@ Or more advanced usage with control of the connection
         btServer = undefined;
         txCharacteristic = undefined;
         rxCharacteristic = undefined;
+        chunkSize = DEFAULT_CHUNKSIZE;
       }
     };
 
@@ -173,12 +183,12 @@ Or more advanced usage with control of the connection
         }
         var txItem = txDataQueue[0];
         puck.writeProgress(txItem.maxLength - txItem.data.length, txItem.maxLength);
-        if (txItem.data.length <= CHUNKSIZE) {
+        if (txItem.data.length <= chunkSize) {
           chunk = txItem.data;
           txItem.data = undefined;
         } else {
-          chunk = txItem.data.substr(0,CHUNKSIZE);
-          txItem.data = txItem.data.substr(CHUNKSIZE);
+          chunk = txItem.data.substr(0,chunkSize);
+          txItem.data = txItem.data.substr(chunkSize);
         }
         connection.txInProgress = true;
         log(2, "Sending "+ JSON.stringify(chunk));
@@ -203,10 +213,9 @@ Or more advanced usage with control of the connection
         filters:[
           { namePrefix: 'Puck.js' },
           { namePrefix: 'Pixl.js' },
+          { namePrefix: 'Jolt.js' },
           { namePrefix: 'MDBT42Q' },
-          { namePrefix: 'RuuviTag' },
-          { namePrefix: 'iTracker' },
-          { namePrefix: 'Thingy' },
+          { namePrefix: 'Bangle.js' },
           { namePrefix: 'Espruino' },
           { services: [ NORDIC_SERVICE ] }
         ], optionalServices: [ NORDIC_SERVICE ]}).then(function(device) {
@@ -240,6 +249,10 @@ Or more advanced usage with control of the connection
         rxCharacteristic.addEventListener('characteristicvaluechanged', function(event) {
           var dataview = event.target.value;
           var data = ab2str(dataview.buffer);
+          if (puck.increaseMTU && (data.length > chunkSize)) {
+            log(2, "Received packet of length "+data.length+", increasing chunk size");
+            chunkSize = data.length;
+          }
           if (puck.flowControl) {
             for (var i=0;i<data.length;i++) {
               var ch = data.charCodeAt(i);
@@ -386,6 +399,10 @@ Or more advanced usage with control of the connection
   var puck = {
     /// Are we writing debug information? 0 is no, 1 is some, 2 is more, 3 is all.
     debug : 1,
+    /** When we receive more than 20 bytes, should we increase the chunk size we use
+    for writing to match it? Normally this is fine but it seems some phones have
+    a broken bluetooth implementation that doesn't allow it. */
+    increaseMTU : true,
     /// Should we use flow control? Default is true
     flowControl : true,
     /// Used internally to write log information - you can replace this with your own function