Impossibile inviare dati ao da Galaxy Nexus tramite LLCP

Question

Possiedo un telefono Galaxy Nexus con Android 4.0.2 e una scheda demo NXP PN532-C106.

Sto provando a collegarli per inviare dati utilizzando il protocollo LLCP e sto utilizzando "npp-server" e "llcp-test-server" da libnfc-llcp per farlo. Ma posso solo far sì che inizino la connessione solo per averla chiusa. Non riesco a inviare alcun dato e alle giunzioni del logcat per indicare che c'è qualcosa di sbagliato nella configurazione della connessione, vedere la fine del post.

Ho cercato di trovare qualsiasi codice di esempio per l'invio di dati e ho provato a utilizzare nfcpy (una libreria python per la comunicazione nfc) ma si rifiuta di trovare la mia demoboard. E l'esempio "npp-server" richiede l'esecuzione di un file e sto utilizzando un file vuoto poiché non so cosa inserirlo.

Non so se c'è qualcosa di sbagliato nel mio setup o se mi manca qualcosa. C'è qualcuno che sa perché la mia connessione muore così velocemente, o ho un esempio funzionante che posso seguire?

Ecco l'output di logcat
Da test con NPP-server di

03-09 14:22:28.035: D/dalvikvm(196): GC_EXPLICIT freed 134K, 10% free 24179K/26759K, paused 6ms+5ms 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte 90 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte ec 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte 50 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte 0 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte 31 
03-09 14:22:58.723: W/NFC-LLC(429): bad LLC length byte 56 
03-09 14:22:59.129: D/NFC JNI(429): Discovered P2P Target 
03-09 14:22:59.137: D/NfcService(429): LLCP Activation message 
03-09 14:22:59.137: D/NfcService(429): NativeP2pDevice.MODE_P2P_TARGET 
03-09 14:22:59.168: D/NfcService(429): Cannot connect remote Target. Polling loop restarted. 
03-09 14:22:59.785: W/ThrottleService(196): unable to find stats for iface rmnet0 
03-09 14:23:04.481: D/dalvikvm(7375): GC_CONCURRENT freed 151K, 2% free 14308K/14535K, paused 7ms+3ms 
03-09 14:23:08.535: D/NfcService(429): Set Foreground Dispatch 
03-09 14:23:08.543: D/NfcService(429): Set Foreground Dispatch 
03-09 14:23:08.598: V/PhoneStatusBar(271): setLightsOn(true) 
03-09 14:23:08.598: I/WindowManager(196): createSurface Window{41c2a718 android.stickynotes/android.stickynotes.StickyNotesActivity paused=false}: DRAW NOW PENDING 
03-09 14:23:20.238: W/NFC-LLC(429): bad LLC length byte d0 
03-09 14:23:20.238: W/NFC-LLC(429): bad LLC length byte db 
03-09 14:23:20.238: W/NFC-LLC(429): bad LLC length byte 52 
03-09 14:23:20.238: W/NFC-LLC(429): bad LLC length byte 1 
03-09 14:23:20.340: W/NFC_uart(429): timeout! 
03-09 14:23:20.340: W/NFC-LLC(429): LLC length mis-match 
03-09 14:23:20.637: D/NfcService(429): SE FIELD ACTIVATED 
03-09 14:23:20.637: D/NfcService(429): SE FIELD DEACTIVATED 

Questa parte è da test con LLCP-test-server di

enter code here 

03-09 14:23:20.653: D/NFC JNI(429): Discovered P2P Target 
03-09 14:23:20.653: D/NfcService(429): LLCP Activation message 
03-09 14:23:20.653: D/NfcService(429): NativeP2pDevice.MODE_P2P_TARGET 
03-09 14:23:20.684: D/NfcService(429): Cannot connect remote Target. Polling loop restarted. 
03-09 14:23:53.957: D/NfcService(429): Set Foreground Dispatch 
03-09 14:23:53.965: D/NfcService(429): Set Foreground Dispatch 
03-09 14:23:53.973: V/PhoneStatusBar(271): setLightsOn(true) 
03-09 14:23:53.988: W/InputManagerService(196): Window already focused, ignoring focus gain of: com.android.internal.view.IInputMethodClient$Stub$Proxy@41a3b620 
03-09 14:24:03.082: W/NFC_uart(429): timeout! 
03-09 14:24:03.082: W/NFC-LLC(429): LLC length mis-match 
03-09 14:24:03.387: D/NfcService(429): SE FIELD ACTIVATED 
03-09 14:24:03.387: D/NfcService(429): SE FIELD DEACTIVATED 
03-09 14:24:03.387: D/NfcService(429): SE FIELD ACTIVATED 
03-09 14:24:03.387: D/NfcService(429): SE FIELD DEACTIVATED 
03-09 14:24:03.418: D/NFC JNI(429): Discovered P2P Initiator 
03-09 14:24:03.418: D/NFC JNI(429): 46 
03-09 14:24:03.418: D/NFC JNI(429): 66 
03-09 14:24:03.418: D/NFC JNI(429): 6d 
03-09 14:24:03.418: D/NfcService(429): LLCP Activation message 
03-09 14:24:03.418: D/NfcService(429): NativeP2pDevice.MODE_P2P_INITIATOR 
03-09 14:24:03.418: I/NFC JNI(429): LLCP Link deactivated 
03-09 14:24:03.418: D/NfcService(429): Target Activate LLCP OK 
03-09 14:24:03.418: I/NfcP2pLinkManager(429): LLCP activated 
03-09 14:24:03.418: D/NfcP2pLinkManager(429): onP2pInRange() 
03-09 14:24:03.426: D/PermissionCache(116): checking android.permission.READ_FRAME_BUFFER for uid=1025 => granted (457 us) 
03-09 14:24:03.567: D/dalvikvm(429): GC_FOR_ALLOC freed 174K, 5% free 14576K/15303K, paused 15ms 
03-09 14:24:03.574: I/dalvikvm-heap(429): Grow heap (frag case) to 17.416MB for 3265936-byte allocation 
03-09 14:24:03.621: D/dalvikvm(429): GC_CONCURRENT freed 4K, 5% free 17761K/18503K, paused 4ms+5ms 
03-09 14:24:03.660: D/NfcP2pLinkManager(429): onP2pSendConfirmationRequested() 
03-09 14:24:03.668: D/NfcService(429): LLCP Link Deactivated message. Restart polling loop. 
03-09 14:24:03.668: D/NfcService(429): not disconnecting from initiator 
03-09 14:24:03.668: I/NfcP2pLinkManager(429): LLCP deactivated. 
03-09 14:24:03.668: D/PhoneStatusBar(271): disable: < EXPAND* icons alerts ticker system_info back home recent clock > 
03-09 14:24:03.676: I/WindowManager(196): createSurface Window{41bde010 paused=false}: DRAW NOW PENDING 
03-09 14:24:03.684: D/libEGL(429): loaded /system/lib/egl/libGLES_android.so 
03-09 14:24:03.699: D/libEGL(429): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so 
03-09 14:24:03.707: D/libEGL(429): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so 
03-09 14:24:03.715: D/libEGL(429): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so 
03-09 14:24:03.817: D/OpenGLRenderer(429): Enabling debug mode 0 
03-09 14:24:03.824: W/IInputConnectionWrapper(7375): showStatusIcon on inactive InputConnection 
03-09 14:24:03.824: W/InputManagerService(196): Starting input on non-focused client com.android.internal.view.IInputMethodClient$Stub$Proxy@41b90588 (uid=10090 pid=7375) 
03-09 14:24:04.426: D/NfcP2pLinkManager(429): Debounce timeout 
03-09 14:24:04.426: D/NfcP2pLinkManager(429): onP2pOutOfRange() 
03-09 14:24:04.754: D/PhoneStatusBar(271): disable: < expand* icons alerts ticker system_info back home recent clock > 
03-09 14:24:04.801: W/SurfaceTexture(429): freeAllBuffersExceptCurrentLocked called but mQueue is not empty 
03-09 14:24:07.676: D/NfcService(429): SE FIELD ACTIVATED 
03-09 14:24:07.699: D/NfcService(429): SE FIELD DEACTIVATED` 

Answer 1

Ho usato questo progetto Arduino + PM532. Ho usato la libreria PN532 su GitHub. Usandolo, potrei inviare testo e immagine dal PM532 al telefono Android. È possibile utilizzare questa libreria (https://github.com/don/NDEF).