ios - Read characteristic from RN4020 with CoreBluetooth -


i've been working on device using rn4020 bluetooth module. need change output , read input device. i've written code using corebluetooth , working on ios that. able (after struggling) set device in command mode , change output.

now want reading input (basically high , low level). set output i'm using following code:

-(void)outputon{ nsdata *data = [@"|o,08,08" datausingencoding:nsutf8stringencoding]; nsmutabledata *mdata = [nsmutabledata datawithdata:data]; unsigned char f8[1] = "\r"; [mdata appendbytes:f8 length:1]; [self.discoveredperipheral writevalue:mdata forcharacteristic:self.mldpdatacharacteristic type:cbcharacteristicwritewithresponse]; }  -(void)outputoff{ nsdata *data = [@"|o,08,00" datausingencoding:nsutf8stringencoding]; nsmutabledata *mdata = [nsmutabledata datawithdata:data]; unsigned char f8[1] = "\r"; [mdata appendbytes:f8 length:1]; [self.discoveredperipheral writevalue:mdata forcharacteristic:self.mldpdatacharacteristic type:cbcharacteristicwritewithresponse]; }

like said working. reading input i've written following code

-(void)readpio2{ nsdata *data = [@"|i,02" datausingencoding:nsutf8stringencoding]; nsmutabledata *mdata = [nsmutabledata datawithdata:data]; unsigned char f8[1] = "\r"; [mdata appendbytes:f8 length:1]; [self.discoveredperipheral writevalue:mdata forcharacteristic:self.mldpdatacharacteristic type:cbcharacteristicwritewithresponse]; }

once i've received callback "didwritevalueforcharacteristic" i'm using following function

[peripheral readvalueforcharacteristic:characteristic];

before doing ensure characteristic readable (which case). in callback function "didupdatevalueforcharacteristic" i've following error:

update value callback error error domain=cbatterrordomain code=2 "reading not permitted." userinfo={nslocalizeddescription=reading not permitted.}

to sum seems i'm not able update characteristic value because read function produce error.

if use smartdata app microchip, i'm able read output command i've mentioned earlier (see attached picture).

does have idea on how read characteristic value?

thanks

the result smartdata app


Comments

Post a Comment

Popular posts from this blog

What is happening when Matlab is starting a "parallel pool"? -

running parallel cpu processes in matlab starts command parpool() according documentation , function: [creates] special job on pool of workers, , [connects] matlab client parallel pool. this function takes bit of time execute, on order of 30 seconds. in other multi-cpu paradigms openmp, parallel execution seems totally transparent -- i've never noticed behavior analogous matlab (granted i'm not experienced parallel programming). so, happening between time parpool() called , when finishes executing? takes long? parallel computing toolbox enables run matlab code in parallel using several different paradigms (e.g. jobs , tasks, parfor , spmd , parfeval , batch processing), , run either locally (parallelised across cores in local machine) or remotely (parallelised across machines in cluster - either 1 own, or 1 in cloud). in of these cases, code run on matlab workers , copies of matlab without interactive desktop. if you're intending run on remo...
Read more

angular - DownloadURL return null in below code -

when change file updated in firebase storage when try downloadurl show null. filechange(event: any) { const imagefolder: string = this.employee.id; const filelist: filelist = event.target.files; const file: file = filelist[0]; const storageref = firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file); console.log(storageref.snapshot.downloadurl); } the put() asynchronous. if want url after file uploaded have this: firebase.storage().ref().child(`${imagefolder}/profile.jpg`).put(file).then((snapshot) => { storageref = snapshot.downloadurl: console.log(snapshot.downloadurl); });
Read more

php - Cannot override Laravel Spark authentication with own implementation -

during login process of laravel spark need request token of remote api. api stores exact same users , passwords laravel spark application. therefore need username , non hashed password of user during authentication process. i thought overriding authenticated method solution problem. in routes/web.php override post /login endpoint , pointing endpoint own logincontroller: <?php namespace app\http\controllers\auth; use illuminate\support\facades\log; use illuminate\http\request; use laravel\spark\http\controllers\auth\logincontroller sparklogincontroller; class logincontroller extends sparklogincontroller { /** * create new login controller instance. * * @return void */ public function __construct() { parent::__construct(); } /** * handle successful authentication attempt. * * @param request $request * @param \illuminate\contracts\auth\authenticatable $user * @return response */ public fu...
Read more