sockets - Arduino loose serial-connection with our server -


we trying develop webapplication receive data arduino. programmed arduino send (on web server) json's every 5 seconds. works fine 1-2 minutes don't receive data arduino. tx keeps blinking our console shows empty string. ideeas? ps. baudrate set 9600 if tell :)

here link code

according github issue page ajson library, seems there memory leak in print(ajsonobject *) function, returns buffer char array allocated malloc(), you're responsible calling free() on again. calling function print(ajsonobject *, ajsonstream *), calls printvalue , print(ajsonobject *), not keep references allocated array , consequently not free it.

it seems making ajson send data directly stream work if modify functions call print(ajsonobject *) free memory.

alternatively, can call print(ajsonobject *) yourself, send contents of char array out serial port, , free memory. easier modify many function calls in library itself.

edit: seems problem indeed, have tried code on mega2560 , printed out free memory after printing each json object (with of this library) , , got this:

{"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 7755 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 7644 <snip> {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 540 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 429 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 318 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 207 {"value1":500,"":1000} freememory = 153  freememory = 153  freememory = 153  freememory = 153

however, there 1 other thing have do, namely calling ajson.deleteitem() on json object, because contributes memory leak. try changing code in loop this:

ajsonobject *msg = createmessage(); char *json = ajson.print(msg); serial.print(json); serial.println(); free(json); ajson.deleteitem(msg);

now, available memory stays same after each loop iteration:

{"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 7884 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 7884 {"value1":500,"value2":1000,"value3":1500,"value4":2000} freememory = 7884 <snip>

edit 2: looks using stream works too, though still have call ajson.deleteitem(msg) after printing data.


Comments

Post a Comment

Popular posts from this blog

commonjs - How to write a typescript definition file for a node module that exports a function? -

consider, toml node module can use: // toml.d.ts declare module toml { export function parse(value:string):any; } declare module "toml" { export = toml; } then: /// <reference path="../../../../../defs/toml/toml.d.ts"/> import toml = require('toml'); toml.parse(...); however, node module export single function, such 'glob' ( https://github.com/isaacs/node-glob ). the node usage of module be: var glob = require("glob") glob("*.js", {}, callback(err, files) { ... }); you'd naively expect this: // glob.d.ts declare function globs(paths:string, options:any, callback:{(err:any, files:string[]):void; ...but because typescripts 'import' semantics bit strange, seems can use 'import .. = require()' statement alias modules . trying call: /// <reference path="../../../../../defs/glob/glob.d.ts"/> import blog = require('glob'); results in: error ts2072: mod
Read more

openid - Okta: Failed to get authorization code through API call -

i'm integrating okta own idp server using okta's api. i'm implementing authorization code flow following steps below: in own server, use /api/v1/authn endpoint sessiontoken. use sessiontoken obtain authorization calling endpoint: /oauth2/v1/authorize?client_id=" + clientid + "&sessiontoken=" + sessiontoken + "&response_type=code&response_mode=query&scope=openid&redirect_uri=" + redirecturl + "&state=evanyang&nonce=" it's supposed return response status code 302 , location header containing redirect url code value. however, keep getting response status code 200 , without location header, html body saying "you using unsupported browser." , "javascript disabled on browser." according api documentation: http://developer.okta.com/docs/api/resources/oidc.html#authentication-request , sessiontoken parameter sufficient this: an okta one-time sessiontoken. allows api-based
Read more

thorough guide for profiling racket code -

did googling ("racket profiling", "racket measure performance"), didn't find , there no examples in docs. did google "profile" search on htdp - no luck. (profile (f ...)) output isn't obvious other small snippets. ideally want python's python -m cprofile usage examples. when search "python profiling", both duckduckgo , google give top result: 26.4. python profilers . (although scanned quickly, seems more of reference "thorough usage guide" examples. if had else in mind, perhaps please link that?) the equivalent racket documentation be: profile: statistical profiler . a usage example: #lang racket (require profile) (profile-thunk (thunk (function-to-profile arg0 arg1) )) here (thunk e) convenience (lambda () e) . bigger example: #lang racket (module mod racket (provide f) (define (f) (for/list ([i 10000]) i))) (require (prefix-in mod: 'mod)) (define (f) (for ([i 10000
Read more