Hi,
You can still use bluetooth unless you really don't want it.. even if the industrial device has no bt there's an adapter to fix that. BT <> RS232
Wireless and more convenient.
If you need specific help let me know.
As I said in the second post, since you have a serial port (RS232, RS485...etc.. then you can still use BT by using an adapter
BT <-> RS232. my controller has no BT but I still use the Android device to send / receive BT information, that will later be translated
by the adapter, completely transparent to you.
You wouldn't need to change anything in your code, because you are talking to the Bluetooth side of the adapter, and not to your controller directly.
That means you can use, for testing, the Bluetooth example and BT chat example without ANY modification.
E.g. the the SEND part should look something like this:
Sub btnSend_Click
Dim txtToSend As String
txtToSend = "This is a test string to be sent by way of Bluetooth"
AStream.Write(txtToSend.GetBytes("UTF8"))
End Sub