Android Question Error: java.io.IOException: Error writing 8 bytes at offset 0 length=8 [UsbSerial AND AsyncStreams LIBRARY]

CorryWestSide · Mar 10, 2025

Here Log when i plug-in and try to start a communication with my otg - USBToIrDa

LOG:

Manufacturer : ARKMICRO     ������������������������������������
Product : USB TO IRDA ��������������������������������������
Serial : not available
DeviceName : /dev/bus/usb/001/014
DeviceClass : USB_CLASS_PER_INTERFACE (per-interface basis)
DeviceSubClass : 0
Device ID : 0x3F6
ProductId : 0x3118
VendorId : 0x18EC
  B4aInterfaceNumber : 0
  InterfaceClass : USB_CLASS_VENDOR_SPEC (vendor specific)
  InterfaceSubClass : 0
  InterfaceProtocol : 0
    EndpointNumber : 1
    EndpointDirection : In
    EndpointType : USB_ENDPOINT_XFER_INT (interrupt)
    EndpointAttribute : 3
    EndpointInterval : 1
    EndpointMaxPacketSize : 4
    EndpointNumber : 2
    EndpointDirection : out
    EndpointType : USB_ENDPOINT_XFER_BULK (bulk)
    EndpointAttribute : 2
    EndpointInterval : 0
    EndpointMaxPacketSize : 64
    EndpointNumber : 2
    EndpointDirection : In
    EndpointType : USB_ENDPOINT_XFER_BULK (bulk)
    EndpointAttribute : 2
    EndpointInterval : 0
    EndpointMaxPacketSize : 64
Device Name:   /dev/bus/usb/001/014
Device ID  :   0x3F6
ProductId  :   0x3118
VendorId   :   0x18EC
Impostata USB con Driver_Silabs
USB Connessa
InputStream: anywheresoftware.b4a.objects.UsbSerial$1@c4d977b
OutputStream: anywheresoftware.b4a.objects.UsbSerial$2@5532998
asstream1 inizializzato
Messaggio START inviato
Error: java.io.IOException: Error writing 8 bytes at offset 0 length=8
Messaggio START inviato
Error: java.io.IOException: Error writing 8 bytes at offset 0 length=8
Dati Output in attesa: 0

Full Code About my app:

#Region  Project Attributes
    #ApplicationLabel: B4A Example
    #VersionCode: 1
    #VersionName:
    #SupportedOrientations: portrait
    #CanInstallToExternalStorage: False
#End Region

#Region  Activity Attributes
    #FullScreen: True
    #IncludeTitle: True
#End Region

#BridgeLogger: True

'Obbiettivo dell'applicazione:
'Sarà un'app di test volta alla creazione di un codice di comunicazione di una chiavetta DONGLE USB IRDA
'che manderà messaggi in formato DDCMP

'passi apparentemente da seguire:
'-Collegare usb al device e riconoscerne il VID e PID [FATTO MEDIANTE CODICE JAVA]
'-Costruire un messaggio in formato DDCMP
'-Mandare il messagigo costruito mediante la comunicazione della USB To IRDA collegata al Modulo Irda nelle vicinanze
'-stampare i risultati


Sub Process_Globals
    Private xui As XUI
End Sub

Sub Globals
    Private btnTest    As Button
    Private btnsetting As Button
    Private txtaudit   As EditText
    Private Thread_1   As Thread
    
    Dim screen         As PreferenceScreen
    Dim baudrate        As String
    Dim Maxbaudrate    As String
    Dim manager        As PreferenceManager
    Dim timeout        As String
    Dim usb1           As UsbSerial
    Dim astreams1       As AsyncStreams
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        CreatePreferenceScreen
        If manager.GetAll.Size = 0 Then SetDefaults
    End If
    
    Activity.LoadLayout("Layout")
    Thread_1.Initialise("Thread_1")
End Sub


Sub Activity_Resume
    HandleSettings
End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Private Sub btnsetting_Click
    StartActivity(screen.CreateIntent)
End Sub

Public Sub StartTest
    Dim device     As Int = 1
    Dim info       As String
    Dim deviceName As String
    Dim deviceId   As String
    Dim productId  As String
    Dim vendorId   As String
    
    'Guida BaudRate "2400", "4800", "9600", "19200", "38400", "57600", "115200"
    
    'Controllo se è presente un dispositivo USB
    If usb1.UsbPresent(device) = usb1.USB_NONE Then : Msgbox("Nessuna USB-IrDa Rilevaya, Collegane una e riprova", "Attenzione") : Return : End If
    
    'mi  da errore con: DRIVER_CDCACM | DRIVER_PROLIFIC
    'non da errore con: DRIVER_FTDI   | DRIVER_SILABS
    'con DRIVER_SILABS ha inviato ma da questo errore: Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
    
    'usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x66F , 0x4200) modello y60 worka ma Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
    'usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x18EC, 0x3118) UsbToIrda   worka ma Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
        
    'Se è presente, ne verifico i permessi
        If (usb1.HasPermission(device)) Then
            
            ' Stampare VID e PID ed eventuali altre informazioni
            info       = usb1.DeviceInfo(device)
            Log(info)
            deviceName = ExtractValue(info, "DeviceName : ")
            deviceId   = ExtractValue(info, "Device ID : ")
            productId  = ExtractValue(info, "ProductId : ")
            vendorId   = ExtractValue(info, "VendorId : ")
            Log("Device Name:   " & deviceName)
            Log("Device ID  :   " & deviceId)
            Log("ProductId  :   " & productId)
            Log("VendorId   :   " & vendorId)
            
            
            If(productId = "0x4200" And vendorId == "0x66f") Then
                usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x66F, 0x4200)
                Log("Impostata USB con Driver_Silabs")
            End If
            
            If(productId = "0x3118" And vendorId == "0x18EC") Then
                usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x18EC, 0x3118)
                Log("Impostata USB con Driver_Silabs")
            End If
            
        If usb1.Open(baudrate,1) <> usb1.USB_NONE Then
            Log("USB Connessa")
            'inizializzo lo Stream
            Log("InputStream: " & usb1.GetInputStream)
            Log("OutputStream: " & usb1.GetOutputStream)
            astreams1.Initialize(usb1.GetInputStream, usb1.GetOutputStream, "astreams1")
        Else
            Log("Errore nella connessione della USB")
        End If
    Else
        usb1.RequestPermission(device)
        Return
    End If

    
    'Configurare i parametri seriali
    usb1.SetParameters(baudrate, usb1.DATABITS_8, usb1.STOPBITS_1, usb1.PARITY_NONE)
    
    'Messaggio da inviare
        Dim START()      As Byte
        START = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x08, 0x01, 0x5B, 0x95)
    
        If(Not(astreams1.IsInitialized)) Then
            Log("asstream1 non inizializzato, impossibile inviare il msg")
            Return
        Else
            Log("asstream1 inizializzato")
            usb1.UsbTimeout = 1000
            
            If(astreams1.OutputQueueSize == 0) Then
                
                astreams1.Write(START)
                Log("Messaggio START inviato")
            
                Sleep(1000)
                astreams1.Write(START)
                Log("Messaggio START inviato")
                Sleep(1000)
                
                Thread_1.Interrupt
                If(Thread_1.IsInterrupted) Then Log("thread_1 Interrotto")
            End If
            Log("Dati Output in attesa: " & astreams1.OutputQueueSize)
        End If
End Sub

'usando la UsbSerial usb1(As UsbSerial) devo:
Sub btnTest_Click
    If(Thread_1.IsInitialized) Then Thread_1.Start(Null, "StartTest",Null)
End Sub

Sub Astreams1_NewData (Buffer() As Byte)
    Dim receivedData As String = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
    Log("Dati ricevuti: " & receivedData)
End Sub

Sub Astreams1_DataAvailable (Buffer() As Byte)
    Dim receivedData As String = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
    Log("Dati ricevuti: " & receivedData)
End Sub

Sub AStreams1_Error
    Log("Error: " & LastException.Message)
    'Log("Connessione Terminata per errore: " & LastException.Message)
    'astreams1.Close
End Sub

Sub Astreams1_Terminated
    Log("Terminated")
    astreams1.Close
End Sub

Sub SetDefaults
    manager.SetString("start_baud_rate_string", "2400")
    manager.SetString("max_baud_rate_string", "115200")
    manager.SetString("timeout_string", "500")
    baudrate    = manager.GetString("start_baud_rate_string")
    Maxbaudrate = manager.GetString("max_baud_rate_string")
    timeout     = manager.GetString("timeout_string")
    PrintInfo
End Sub

Sub CreatePreferenceScreen
    'BAUD RATE [115200,19200,2400,38400,4800,57600,9600]
    Dim moduleSettings As PreferenceCategory
    
    screen.Initialize("", "")
    
    moduleSettings.Initialize("")
    
    moduleSettings.AddEditText("security_string","Security","DDCMP security code","") 'SECURITY CODE FOR DDCMP
    
    moduleSettings.AddEditText("password_string","Password","DDCMP password code","") 'PASSWORD CODE FOR DDCMP
    
    moduleSettings.AddEditText("timeout_string","timeout","START timeout","") 'timeout for start message
    
    moduleSettings.AddList("max_baud_rate_string", "Max Baud", "Default", "Default", _
                            Array As String("Default", "2400", "4800", "9600", "19200", "38400", "57600", "115200"))
                            
    moduleSettings.AddList("start_baud_rate_string", "Start Baud", "Default", "Default", _
                            Array As String("Default", "2400", "4800", "9600", "19200", "38400", "57600", "115200"))               
    
    screen.AddPreferenceCategory(moduleSettings)
End Sub

Sub HandleSettings
    baudrate    = manager.GetString("start_baud_rate_string")
    Maxbaudrate = manager.GetString("max_baud_rate_string")
    timeout     = manager.GetString("timeout_string")
    manager.SetString("start_baud_rate_string", baudrate)
    manager.SetString("max_baud_rate_string"  , Maxbaudrate)
    manager.SetString("timeout_string"       , timeout)
    PrintInfo
End Sub

Sub PrintInfo
    Log("BaudRate "      & baudrate)
    Log("Max BaudRate "  & Maxbaudrate)
    Log("Start TimeOut " & timeout)
End Sub

Sub ExtractValue(info As String, label As String) As String
    Dim startPos As Int = info.IndexOf(label) + label.Length
    Dim endPos As Int = info.IndexOf2(Chr(10), startPos) ' Cerca la fine della riga
    If endPos = -1 Then endPos = info.Length ' Se non trova il termine, prende tutto fino alla fine
    Return info.SubString2(startPos, endPos).Trim
End Sub

i have the error when i try to send START

CorryWestSide · Mar 14, 2025

someone can answer me? pls? very pls? @Erel

Erel · Mar 16, 2025

1. Switch to B4XPages. You are not handling the complex activity life cycle correctly.
2. You don't need the threading library when working with USB.

CorryWestSide · Mar 17, 2025

Erel said:
1. Switch to B4XPages. You are not handling the complex activity life cycle correctly.
2. You don't need the threading library when working with USB.

uhmm okay but if i dont insert the Threading Library i receive this:

LOG:

** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
BaudRate 115200
Start TimeOut 1
Presence Device  = 1
product     :   urer : ARKMICRO
Manufacture :   : ARKMICRO
Device Name :   /dev/bus/usb/001/002
Device ID   :   0x3EA
ProductId   :   0x3118
VendorId    :   0x18EC
Impostata USB - Model UsbToIrda con Driver_Silabs
USB Open : 1
USB Connessa
InputStream: anywheresoftware.b4a.objects.UsbSerial$1@cc33f1d
OutputStream: anywheresoftware.b4a.objects.UsbSerial$2@9cae592
asstream1 inizializzato
Messaggio START inviato
Messaggio START inviato
Dati Output in attesa: 1
Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.write(byte[], int)' on a null object reference
Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference

Erel · Mar 17, 2025

I don't see how it is possible to help you with the information you provided.

You can try felUsbSerial: https://www.b4x.com/android/forum/threads/felusbserial-alternative-usb-serial-library.62216/#content

CorryWestSide · Mar 18, 2025

Erel said:
I don't see how it is possible to help you with the information you provided.

You can try felUsbSerial: https://www.b4x.com/android/forum/threads/felusbserial-alternative-usb-serial-library.62216/#content

i try in this days this:
-I have two of UsbDongleIrda that link with otg-cable to my android
-I try to send Data with an External App and immediatly close to pass on my B4A app
-when i pass and press button you know what happen? happen that the device Read the all data, so its work but!
-the only thing that not work is the SendData, i write bettere the code btw

code improved:

#Region  Project Attributes
    #ApplicationLabel: SisoftVendingComunicationTest
    #VersionCode: 1
    #VersionName:
    #SupportedOrientations: portrait
    #CanInstallToExternalStorage: False
#End Region

#Region  Activity Attributes
    #FullScreen: True
    #IncludeTitle: True
#End Region

#BridgeLogger: True

'Obbiettivo dell'applicazione:
'Sarà un'app di test volta alla creazione di un codice di comunicazione di una chiavetta DONGLE USB IRDA
'che manderà messaggi in formato DDCMP

'passi apparentemente da seguire:
'-Collegare usb al device e riconoscerne il VID e PID [FATTO MEDIANTE CODICE JAVA]
'-Costruire un messaggio in formato DDCMP
'-Mandare il messagigo costruito mediante la comunicazione della USB To IRDA collegata al Modulo Irda nelle vicinanze
'-stampare i risultati


Sub Process_Globals
    Private xui As XUI
End Sub

Sub Globals
    Private btnTest    As Button
    Private btnsetting As Button
    Private txtaudit   As EditText
    
    Dim screen         As PreferenceScreen
    Dim baudrate        As String
    Dim Maxbaudrate    As String
    Dim manager        As PreferenceManager
    Dim timeout        As String
    Dim usb1           As UsbSerial
    Dim astreams1       As AsyncStreams
    
    Dim START()      As Byte
    Dim WHOAREYOU()  As Byte
    Dim STD_ACK()    As Byte
End Sub

Sub Activity_Create(FirstTime As Boolean)
    If FirstTime Then
        CreatePreferenceScreen
        If manager.GetAll.Size = 0 Then SetDefaults
    End If
    
    Activity.LoadLayout("Layout")
End Sub


Sub Activity_Resume
    HandleSettings
End Sub

Sub Activity_Pause (UserClosed As Boolean)

End Sub

Private Sub btnsetting_Click
    StartActivity(screen.CreateIntent)
End Sub

Public Sub StartTest
    Log("entra")
    Dim device      As Int = 1
    Dim info        As String
    Dim deviceName  As String
    Dim deviceId    As String
    Dim productId   As String
    Dim vendorId    As String
    Dim product     As String
    Dim manufacture As String
    
    'Guida BaudRate "2400", "4800", "9600", "19200", "38400", "57600", "115200"
    
    'Controllo se è presente un dispositivo USB
    If usb1.UsbPresent(device) = usb1.USB_NONE Then : Msgbox("Nessuna USB-IrDa Rilevaya, Collegane una e riprova", "Attenzione") : Return : End If
    
    'mi  da errore con: DRIVER_CDCACM | DRIVER_PROLIFIC
    'non da errore con: DRIVER_FTDI   | DRIVER_SILABS
    'con DRIVER_SILABS ha inviato ma da questo errore: Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
    
    'usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x66F , 0x4200) modello y60 worka ma Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
    'usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x18EC, 0x3118) UsbToIrda   worka ma Error: java.lang.NullPointerException: Attempt to invoke interface method 'int com.hoho.android.usbserial.driver.UsbSerialDriver.read(byte[], int)' on a null object reference
        
    'Se è presente, ne verifico i permessi
    If (usb1.HasPermission(device)) Then
            ' Stampare VID e PID ed eventuali altre informazioni
            Log("Presence Device  = " & usb1.UsbPresent(device))
            info       = usb1.DeviceInfo(device)
            'Log(info)
            product     = ExtractValue(info, "Product: "    )
            manufacture = ExtractValue(info, "Manufacture: ")
            deviceName  = ExtractValue(info, "DeviceName : ")
            deviceId    = ExtractValue(info, "Device ID : " )
            productId   = ExtractValue(info, "ProductId : " )
            vendorId    = ExtractValue(info, "VendorId : "  )
            
            Log("product     :   " & product)
            Log("Manufacture :   " & manufacture)
            Log("Device Name :   " & deviceName)
            Log("Device ID   :   " & deviceId)
            Log("ProductId   :   " & productId)
            Log("VendorId    :   " & vendorId)
            
            
            If(productId = "0x4200" And vendorId == "0x66F") Then
                usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x66F, 0x4200)
                Log("Impostata USB - Model Y con Driver_Silabs")
            End If
            
            If(productId = "0x3118" And vendorId == "0x18EC") Then
                usb1.SetCustomDevice(usb1.DRIVER_SILABS, 0x18EC, 0x3118)
                Log("Impostata USB - Model UsbToIrda con Driver_Silabs")
            End If
        
        Dim dev As Int = usb1.Open(baudrate,1) : Log ("USB Open : " & dev)
        If dev <> usb1.USB_NONE Then
            Log("USB Connessa")
            'inizializzo lo Stream
            Log("InputStream: " & usb1.GetInputStream) : Log("OutputStream: " & usb1.GetOutputStream)
            
            astreams1.Initialize(usb1.GetInputStream, usb1.GetOutputStream, "astreams1")
        Else
            Log("Errore nella connessione della USB")
        End If
    Else
        usb1.RequestPermission(device)
        Return
    End If
    
        'Configurare i parametri seriali
        usb1.SetParameters(baudrate, usb1.DATABITS_8, usb1.STOPBITS_1, usb1.PARITY_NONE)
    
        'Messaggio da inviare
        BuildStartMessage
        WHOAREYOU = Array As Byte(0x81, 0x10, 0x40, 0x00, 0x01, 0x01, 0x0A, 0x42, 0x77,0xE0)
        STD_ACK   = Array As Byte(0x05, 0x01, 0x40, 0x01, 0x00, 0x01, 0xB8, 0x55)
    
        If(Not(astreams1.IsInitialized)) Then
            Log("asstream1 non inizializzato, impossibile inviare il msg")
            Return
        Else
            Log("asstream1 inizializzato")
            usb1.UsbTimeout = timeout
            
            If(astreams1.OutputQueueSize == 0) Then
                SendMessage(START,"START")
                Sleep(1000)
                SendMessage(START,"START 2")
                Sleep(1000)
                SendMessage(WHOAREYOU,"WHOAREYOU")
                Sleep(1000)
                SendMessage(STD_ACK,"STD_ACK")
                Sleep(1000)
            End If
            
            Log("Dati Output in attesa: " & astreams1.OutputQueueSize)
        End If
End Sub

Sub BuildStartMessage()
    Select baudrate
        Case "1200"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x01, 0x01, 0x5B, 0x95)
        Case "2400"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x02, 0x01, 0x5B, 0x95)
        Case "4800"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x03, 0x01, 0x5B, 0x95)
        Case "9600"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x04, 0x01, 0x5B, 0x95)
        Case "19200"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x05, 0x01, 0x5B, 0x95)
        Case "38400"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x06, 0x01, 0x5B, 0x95)
        Case "57600"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x07, 0x01, 0x5B, 0x95)
        Case "115200"
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x08, 0x01, 0x5B, 0x95)
        Case Else
            START     = Array As Byte(0x05, 0x06, 0x40, 0x00, 0x08, 0x01, 0x5B, 0x95)
    End Select
End Sub

Sub SendMessage(msg() As Byte,msglbl As String)
    
    astreams1.Write(msg)
    
    ' Converte il messaggio in una stringa esadecimale formattata
    Dim hexMsg As String = ""
    For Each b As Byte In msg
        hexMsg = hexMsg & Bit.ToHexString(Bit.And(b, 0xFF)).ToUpperCase & ","
    Next
    hexMsg = hexMsg.SubString2(0, hexMsg.Length - 1) ' Rimuove l'ultima virgola finale
    
    Log("Messaggio " & msglbl & " inviato " & hexMsg)
End Sub

Sub btnTest_Click
    txtaudit.Text = ""
    StartTest
End Sub

Sub astreams1_NewData (Buffer() As Byte)
    
    Dim hexMsg As String = ""
    For Each b As Byte In Buffer
        hexMsg = hexMsg & Bit.ToHexString(Bit.And(b, 0xFF)).ToUpperCase & ","
    Next
    hexMsg = hexMsg.SubString2(0, hexMsg.Length - 1) ' Rimuove l'ultima virgola finale
    
    Log("Messaggio ricevuto " & hexMsg)
    
    txtaudit.Text = txtaudit.Text & " " & hexMsg
End Sub

Sub astreams1_DataAvailable (Buffer() As Byte)
    Dim receivedData As String = BytesToString(Buffer, 0, Buffer.Length, "UTF8")
    Log("DataAvailable ricevuti: " & receivedData)
End Sub

Sub astreams1_Error
    Log("Error: " & LastException.Message)
    astreams1.Close
End Sub

Sub astreams1_Terminated
    Log("Terminated")
    astreams1.Close
End Sub

Sub SetDefaults
    manager.SetString("start_baud_rate_string", "2400")
    manager.SetString("max_baud_rate_string", "115200")
    manager.SetString("timeout_string", "500")
    baudrate    = manager.GetString("start_baud_rate_string")
    Maxbaudrate = manager.GetString("max_baud_rate_string")
    timeout     = manager.GetString("timeout_string")
    PrintInfo
End Sub

Sub CreatePreferenceScreen
    'BAUD RATE [115200,19200,2400,38400,4800,57600,9600]
    Dim moduleSettings As PreferenceCategory
    
    screen.Initialize("", "")
    
    moduleSettings.Initialize("")
    
    moduleSettings.AddEditText("security_string","Security","DDCMP security code","") 'SECURITY CODE FOR DDCMP
    
    moduleSettings.AddEditText("password_string","Password","DDCMP password code","") 'PASSWORD CODE FOR DDCMP
    
    moduleSettings.AddEditText("timeout_string","timeout","START timeout","") 'timeout for start message
    
    moduleSettings.AddList("max_baud_rate_string", "Max Baud", "Default", "Default", _
                            Array As String("Default", "2400", "4800", "9600", "19200", "38400", "57600", "115200","460800"))
                            
    moduleSettings.AddList("start_baud_rate_string", "Start Baud", "Default", "Default", _
                            Array As String("Default", "2400", "4800", "9600", "19200", "38400", "57600", "115200" , "460800"))               
    
    screen.AddPreferenceCategory(moduleSettings)
End Sub

Sub HandleSettings
    baudrate    = manager.GetString("start_baud_rate_string")
    Maxbaudrate = manager.GetString("max_baud_rate_string")
    timeout     = manager.GetString("timeout_string")
    manager.SetString("start_baud_rate_string", baudrate)
    manager.SetString("max_baud_rate_string"  , Maxbaudrate)
    manager.SetString("timeout_string"       , timeout)
    PrintInfo
End Sub

Sub PrintInfo
    Log("BaudRate "      & baudrate)
    Log("Max BaudRate "  & Maxbaudrate)
    Log("Start TimeOut " & timeout)
End Sub

Sub ExtractValue(info As String, label As String) As String
    Dim startPos As Int = info.IndexOf(label) + label.Length
    Dim endPos As Int = info.IndexOf2(Chr(10), startPos) ' Cerca la fine della riga
    If endPos = -1 Then endPos = info.Length ' Se non trova il termine, prende tutto fino alla fine
    Return info.SubString2(startPos, endPos).Trim
End Sub

Log without external app:

entra
Presence Device  = 1
product     :   urer : ARKMICRO
Manufacture :   : ARKMICRO
Device Name :   /dev/bus/usb/001/010
Device ID   :   0x3F2
ProductId   :   0x3118
VendorId    :   0x18EC
Impostata USB - Model UsbToIrda con Driver_Silabs
USB Open : 1
USB Connessa
InputStream: anywheresoftware.b4a.objects.UsbSerial$1@1cd8e0a
OutputStream: anywheresoftware.b4a.objects.UsbSerial$2@b88b67b
asstream1 inizializzato
Messaggio START inviato 5,6,40,0,8,1,5B,95
Messaggio START 2 inviato 5,6,40,0,8,1,5B,95
Messaggio WHOAREYOU inviato 81,10,40,0,1,1,A,42,77,E0
Error: java.io.IOException: Error writing 10 bytes at offset 0 length=10
Messaggio STD_ACK inviato 5,1,40,1,0,1,B8,55
Dati Output in attesa: 0

Log with send data External App:

entra
Presence Device  = 1
product     :   urer : ARKMICRO
Manufacture :   : ARKMICRO
Device Name :   /dev/bus/usb/001/010
Device ID   :   0x3F2
ProductId   :   0x3118
VendorId    :   0x18EC
Impostata USB - Model UsbToIrda con Driver_Silabs
USB Open : 1
USB Connessa
InputStream: anywheresoftware.b4a.objects.UsbSerial$1@1cd8e0a
OutputStream: anywheresoftware.b4a.objects.UsbSerial$2@b88b67b
asstream1 inizializzato
Messaggio START inviato 5,6,40,0,8,1,5B,95
Messaggio START 2 inviato 5,6,40,0,8,1,5B,95
Messaggio WHOAREYOU inviato 81,10,40,0,1,1,A,42,77,E0
Error: java.io.IOException: Error writing 10 bytes at offset 0 length=10
Messaggio STD_ACK inviato 5,1,40,1,0,1,B8,55
Dati Output in attesa: 0
** Activity (main) Pause, UserClosed = false **
** Activity (main) Resume **
BaudRate 115200
Max BaudRate 2400
Start TimeOut 1
entra
Presence Device  = 1
product     :   urer : ARKMICRO
Manufacture :   : ARKMICRO
Device Name :   /dev/bus/usb/001/010
Device ID   :   0x3F2
ProductId   :   0x3118
VendorId    :   0x18EC
Impostata USB - Model UsbToIrda con Driver_Silabs
USB Open : 1
USB Connessa
InputStream: anywheresoftware.b4a.objects.UsbSerial$1@de179f3
OutputStream: anywheresoftware.b4a.objects.UsbSerial$2@11b26b0
asstream1 inizializzato
Messaggio START inviato 5,6,40,0,8,1,5B,95
Messaggio ricevuto 2A,35
Messaggio ricevuto FF
Messaggio ricevuto E8
Messaggio ricevuto 2A
Messaggio ricevuto 2A
Messaggio ricevuto 69
Messaggio ricevuto 4D
Messaggio ricevuto 78
Messaggio ricevuto 43
Messaggio ricevuto 2A
Messaggio ricevuto 32
Messaggio ricevuto 30
Messaggio ricevuto 2A
Messaggio ricevuto 31
Messaggio ricevuto 2A
Messaggio ricevuto 31
Messaggio ricevuto D
Messaggio ricevuto A
Messaggio ricevuto 8D
Messaggio ricevuto F9
Messaggio ricevuto 35
Messaggio ricevuto 2A
Messaggio ricevuto 35
Messaggio ricevuto 2A
Messaggio WHOAREYOU inviato 81,10,40,0,1,1,A,42,77,E0
Messaggio STD_ACK inviato 5,1,40,1,0,1,B8,55
Dati Output in attesa: 0

Android Question Error: java.io.IOException: Error writing 8 bytes at offset 0 length=8 [UsbSerial AND AsyncStreams LIBRARY]

CorryWestSide

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CorryWestSide

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CorryWestSide

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Erel

B4X founder

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