B4J Question BANano and Web Serial API

[dk9uv]

Hi,
with the Web Serial API it is possible to connect to serial devices from the webbrowser (Chrome only).
There are examples like this terminal programm: serialterminal
I wonder if it would be possible to write a similar programm in B4J and transpile it to Javascript using BANano?
Any recommendations highly appreciated.

Chris

 

[MichalK73]

I looked at the 'serial terminal' code and maybe it would be possible to connect to the banana, but no one will do it unless they want to use it themselves. I guess no one has time for that.

 

[alwaysbusy]

@dk9uv Here is something to get you started. I have no idea what works or not as I do not have any compatible serial device to test it. I added a OPN2001 scanner (which has its own Serial to USB driver) and I know this driver does not work well with the Web Serial API. I can connect, but that is about it. The OPN2001 does not allow you to do anything more, but maybe you have a serial device that does allow other things.

I would appreciate your feedback!

https://gorgeousapps.com/WebSerial.zip

Alwaysbusy

 

[GMan]

BananoSkeleton is missing ?

 

[alwaysbusy]

BananoSkeleton is missing ?

That is a separate library. B4J Libraries are never included in .zip files when exported in the IDE. It is in the official download of the BANano library: https://www.b4x.com/android/forum/t...h-abstract-designer-support.99740/post-627764 (use the beta)

 

[GMan]

Got it, but get an error when compiling

MainPageHolder.Element.LoadLayout("WelcomePageLayout")

 

[alwaysbusy]

It is not used in this project. I don't get this error so maybe try the sync button in the files tab.

I see, change it to:

Sub MenuList_Click (returnName As String)
    ' here we can load the layout of the menu item we clicked
    Select Case returnName
        Case "page1"
            MainPageHolder.Element.Empty
            MainPageHolder.Element.LoadLayout("WebSerialPageLayout") '<--------
    End Select
    ' and close the menu, if not always open
    If MainSidebar.AlwaysOpen = False Then
        MainSidebar.Close
    End If    
End Sub

 

[GMan]

Did that already ;-)
Uploaded on my external webserver, works fo far....but: i have an ARDUINO Nano pugged in (COM19) whis is not shown.

Did i miss something ?

 

[alwaysbusy]

As I said, absolutely no idea what works or not. I have nothing that uses serial. Web Serial is very experimental and I haven't found a device yet where it works.

- Does it work with the link in the first post? (the original JavaScript code).
- Do you see errors in the Chrome Developer logs?

 

[alwaysbusy]

Note that the device has to be connected on your local PC and it is highly probable your Web Server needs to be https with a valid certificate.

 

[GMan]

Yeah, its local connected an i have a valid certificate,too

 

[alwaysbusy]

- Does it work with the link in the first post? (the original JavaScript code).
- Do you see errors in the Chrome Developer logs?

+ what baudRate do you use? You may have also set stuff like the dataBits, parity and so on required by the Arduino.

If it does not work with the link in the first post, then it will definitely not work with the BANano version.

 

[GMan]

Now used another NANO and now it works...can received text from NANO serialport

 

[GMan]

See PN

 

[GMan]

 

[Mashiane]

Thank you so much for this, I will just add this previous question here so that we have related content together.

[BANano] Beginning Serial Port Communications

Hi there.. I am trying to convert this code here as a start.. https://whatwebcando.today/serial.html I don't have a serial port also. :rolleyes: I have attached a BANano Project to indicate my trial, a trial and error exercise. Its BANanoObject and then some await! you can imagine! Please...

www.b4x.com

 

[dk9uv]

@dk9uv Here is something to get you started. I have no idea what works or not as I do not have any compatible serial device to test it. I added a OPN2001 scanner (which has its own Serial to USB driver) and I know this driver does not work well with the Web Serial API. I can connect, but that is about it. The OPN2001 does not allow you to do anything more, but maybe you have a serial device that does allow other things.

I would appreciate your feedback!

https://gorgeousapps.com/WebSerial.zip

Alwaysbusy

Thank you very much, great help. I successfully did the first tests. I connected a USB to RS-485 converter and can talk to a RS-485 temperature sensor (simple ASCII request response). I have to become more familiar with BANano to be able to extend the app. Future plans include Modbus support.
Chris