Is Espruino right for my project?

You are reading a single comment by @allObjects and its replies. Click here to read the full conversation.

•

allObjects

After some wifi connectivity skirmishes with the CC3000 module - see - I'n now ready to read data... this is the code I'm using:

var SSID = "MySSID";
var WPA2Key = "MyWPA2Key";

var log = function(s,e) { 
  var p = "" + (Math.round((getTime() - t0) * 1000) / 1000) + "000";
  var d = p.indexOf("."); console.log(((e) ? "E: " : "-: ") + ((p < 0) ? 
    p.substr(p.length - 3) + ".000" : p.substr(0,d + 4)) + ": "+ s);
};

var t0 = getTime();
log("Connecting to CC3000...");
var wlan = require("CC3000").connect();
if (wlan) {
  log("Connecting to wifi access point...");
  wlan.connect( SSID, WPA2Key, function (s) {
    log("Connected with " + s);
    if (s == "dhcp") {
      require("http").get("http://54.148.129.10/ldbwsService.php", function(res) {
        var str = "";
        res.on('data', function(data) {
          log(">" + data);
          str += data;
        });
        res.on('close', function() {
          log("str: " + str);
          var obj = JSON.parse(str);
          log("obj: "); console.log(obj);
          var mem = process.memory();
          log("Memory free: " + mem.free + "  -  usage: " + mem.usage);
          wlan.disconnect();
          log('CC3000 disconnected.');
        });
      });
    }
  });
} else {
  log("Did not get wlan object / not connected to CC3000.",1);
}

And this is the expected response - so far in the console... is:

response fragments (>)
response string - a JSON string, all of it (str: ....)
JSON parsed object (obj: ...)

The time is in [s].[ms] to give a feeling about the speed behavior:

about 20[s] for to connect

about 1.5[s] for sending the request, get the response, and parse it into an object.

      |_| http://espruino.com
1v71 Copyright 2014 G.Williams
>echo(0);
-: 0.001: Connecting to CC3000...
-: 2.629: Connecting to wifi access point...
=undefined
-: 9.079: Connected with connect
-: 19.227: Connected with dhcp
-: 19.229: Sending request
-: 20.418: >{"generatedA
-: 20.423: >t":"2015-01-12T07:36:00.9734935+00:00","locationName":"Reading",
-: 20.429: >"crs":"RDG","platformAvailable":true,"nrccMessages":"","trainSer
-: 20.435: >vices":[{"origin":{"locationName":"Reading","crs":"RDG"},"destin
-: 20.441: >ation":{"locationName":"London Paddington","crs":"PAD"},"std":"0
-: 20.447: >7:34","etd":"07:36","platform":"14","serviceID":"9yEl2b7IcoQGhuh
-: 20.452: >J7UqicA==","subsequentCallingPoints":[{"locationName":"Twyford",
-: 20.458: >"st":"07:41","et":"On time"},{"locationName":"Maidenhead","st":"
-: 20.464: >07:49","et":"On time"},{"locationName":"Taplow","st":"07:53","et
-: 20.470: >":"On time"},{"locationName":"Burnham","st":"07:56","et":"On tim
-: 20.476: >e"},{"locationName":"Slough","st":"08:01","et":"On time"},{"loca
-: 20.482: >tionName":"Langley","st":"08:06","et":"On time"},{"locationName"
-: 20.487: >:"West Drayton","st":"08:11","et":"On time"},{"locationName":"Ha
-: 20.493: >yes & Harlington","st":"08:16","et":"On time"},{"locationName":"
-: 20.499: >Southall","st":"08:20","et":"On time"},{"locationName":"Ealing B
-: 20.505: >roadway","st":"08:25","et":"On time"},{"locationName":"London Pa
-: 20.511: >ddington","st":"08:38","et":"On time"}],"operator":"First Great
-: 20.517: >Western","operatorCode":"GW"},{"origin":{"locationName":"Worcest
-: 20.523: >er Shrub Hill","crs":"WOS"},"destination":{"locationName":"Londo
-: 20.529: >n Paddington","crs":"PAD"},"std":"07:35","etd":"On time","platfo
-: 20.535: >rm":"11","serviceID":"vUUvejQm7x3F4dRM+SqC1g==","subsequentCalli
-: 20.540: >ngPoints":"","operator":"First Great Western","operatorCode":"GW
-: 20.546: >"},{"origin":{"locationName":"Reading","crs":"RDG"},"destination
-: 20.552: >":{"locationName":"Basingstoke","crs":"BSK"},"std":"07:37","etd"
-: 20.558: >:"On time","platform":"2","serviceID":"I25K292y51sCtA1NaP7\/Gg==
-: 20.564: >","subsequentCallingPoints":"","operator":"First Great Western",
-: 20.570: >"operatorCode":"GW"},{"origin":{"locationName":"Frome","crs":"FR
-: 20.576: >O"},"destination":{"locationName":"London Paddington","crs":"PAD
-: 20.582: >"},"std":"07:39","etd":"On time","platform":"8","serviceID":"qcq
-: 20.588: >riRjZax87JaIWts3i6g==","subsequentCallingPoints":"","operator":"
-: 20.594: >First Great Western","operatorCode":"GW"}]}
-: 20.641: str: {"generatedAt":"2015-01-12T07:36:00.9734935+00:00","locationName":"Reading","crs":"RDG","platformAvailable":true,"nrccMessages":"","trainServices":[{"origin":{"locationName":"Reading","crs":"RDG"},"destination":{"locationName":"London Paddington","crs":"PAD"},"std":"07:34","etd":"07:36","platform":"14","serviceID":"9yEl2b7IcoQGhuhJ7UqicA==","subsequentCallingPoints":[{"locationName":"Twyford","st":"07:41","et":"On time"},{"locationName":"Maidenhead","st":"07:49","et":"On time"},{"locationName":"Taplow","st":"07:53","et":"On time"},{"locationName":"Burnham","st":"07:56","et":"On time"},{"locationName":"Slough","st":"08:01","et":"On time"},{"locationName":"Langley","st":"08:06","et":"On time"},{"locationName":"West Drayton","st":"08:11","et":"On time"},{"locationName":"Hayes & Harlington","st":"08:16","et":"On time"},{"locationName":"Southall","st":"08:20","et":"On time"},{"locationName":"Ealing Broadway","st":"08:25","et":"On time"},{"locationName":"London Paddington","st":"08:38","et":"On time"}],"operator":"First Great Western","operatorCode":"GW"},{"origin":{"locationName":"Worcester Shrub Hill","crs":"WOS"},"destination":{"locationName":"London Paddington","crs":"PAD"},"std":"07:35","etd":"On time","platform":"11","serviceID":"vUUvejQm7x3F4dRM+SqC1g==","subsequentCallingPoints":"","operator":"First Great Western","operatorCode":"GW"},{"origin":{"locationName":"Reading","crs":"RDG"},"destination":{"locationName":"Basingstoke","crs":"BSK"},"std":"07:37","etd":"On time","platform":"2","serviceID":"I25K292y51sCtA1NaP7\/Gg==","subsequentCallingPoints":"","operator":"First Great Western","operatorCode":"GW"},{"origin":{"locationName":"Frome","crs":"FRO"},"destination":{"locationName":"London Paddington","crs":"PAD"},"std":"07:39","etd":"On time","platform":"8","serviceID":"qcqriRjZax87JaIWts3i6g==","subsequentCallingPoints":"","operator":"First Great Western","operatorCode":"GW"}]}
-: 20.667: obj:
{
"generatedAt": "2015-01-12T07:36:00.9734935+00:00",
"locationName": "Reading",
"crs": "RDG",
"platformAvailable": true,
"nrccMessages": "",
"trainServices": [
{
  "origin": {
"locationName": "Reading",
"crs": "RDG"
   },
  "destination": {
"locationName": "London Paddington",
"crs": "PAD"
   },
  "std": "07:34",
  "etd": "07:36",
  "platform": "14",
  "serviceID": "9yEl2b7IcoQGhuhJ7UqicA==",
  "subsequentCallingPoints": [
{
"locationName": "Twyford",
"st": "07:41",
"et": "On time"
},
{
"locationName": "Maidenhead",
"st": "07:49",
"et": "On time"
},
{
"locationName": "Taplow",
"st": "07:53",
"et": "On time"
},
{
"locationName": "Burnham",
"st": "07:56",
"et": "On time"
},
{
"locationName": "Slough",
"st": "08:01",
"et": "On time"
},
{
"locationName": "Langley",
"st": "08:06",
"et": "On time"
},
{
"locationName": "West Drayton",
"st": "08:11",
"et": "On time"
},
{
"locationName": "Hayes & Harlington",
"st": "08:16",
"et": "On time"
},
{
"locationName": "Southall",
"st": "08:20",
"et": "On time"
},
{
"locationName": "Ealing Broadway",
"st": "08:25",
"et": "On time"
},
{
"locationNa e": "London Paddington",
"st": "08:38",
"et": "On time"
}
   ],
  "operator": "First Great Western",
  "operatorCode": "GW"
 },
{
  "origin": {
"locationName": "Worcester Shrub Hill",
"crs": "WOS"
   },
  "destination": {
"locationName": "London Paddington",
"crs": "PAD"
   },
  "std": "07:35",
  "etd": "On time",
  "platform": "11",
  "serviceID": "vUUvejQm7x3F4dRM+SqC1g==",
  "subsequentCallingPoints": "",
  "operator": "First Great Western",
  "operatorCode": "GW"
 },
{
  "origin": {
"locationName": "Reading",
"crs": "RDG"
   },
  "destination": {
"locationName": "Basingstoke",
"crs": "BSK"
   },
  "std": "07:37",
  "etd": "On time",
  "platform": "2",
  "serviceID": "I25K292y51sCtA1NaP7/Gg==",
  "subsequentCallingPoints": "",
  "operator": "First Great Western",
  "operatorCode": "GW"
 },
{
  "origin": {
"locationName": "Frome",
"crs": "FRO"
   },
  "destination": {
"locationName": "London Paddington",
"crs": "PAD"
   },
  "std": "07:39",
  "etd": "On time",
  "platform": "8",
  "serviceID": "qcqriRjZax87JaIWts3i6g==",
  "subsequentCallingPoints": "",
  "operator": "First Great Western",
  "operatorCode": "GW"
 }
]
}
-: 20.724: Memory free: 1469  -  usage: 781
-: 20.727: CC3000 disconnected.
>

The very very first request brought the response string in on shot. I then added the JASON.parse to the simple sample code as described in Clienbt paragraph on CC3000 Module page. In great anticipation... nope: all following requests brought only a very tiny fragment containing: {requestedA. That was all. Some more reading - notably from the overall Internet (HTTP) page - lead back to working code again. Even though it is only a single shot at data, I'm satisfied for now. More later.

Is Espruino right for my project?

About

Espruino