B4J Question Where can I download the B4J USB library?

[davepamn]

I was able to download and run the B4A USB library. I need to now, download the B4J USB library. Where can I find the B4J libraries

 

[Roycefer]

I don't think there is a B4J USB library. There's a B4J jSerial library that will probably suit your purposes, though. https://www.b4x.com/android/forum/threads/jserial-library.34762/#content

 

[davepamn]

I install JSerial. I open an serial object assigned to the com1 port and connected an asyncStream to the serial object.

The serial object is set to receive and input stream and transmit on an output stream.

How can I tell if the printer is receiving data?

sp.Open(cmbPort.Value)
astream.InitializePrefix(sp.GetInputStream, True, sp.GetOutputStream, "astream")

Sub senddata(Data As String)
    Dim buffer() As Byte    =Data.getbytes("UTF8")
    astream.Write(buffer)
EndSub

 

[Erel]

You shouldn't use prefix mode.

Unless the printer sends an acknowledgment there is no way to know.