Issue with Modbus Write -- PLC Connection Exception: Error Creating Channel

[Maximilian Tan <ma...@gmail.com>]

Hi!

Thanks for supporting this library.

I'd like to seek your advice on an issue I'm having surrounding writing to
modbus registers.

I have a code snippet as follows:
[image: image.png]

I'm able to make about ~150 requests successfully, until I encounter a PLC
Connection Exception: Error creating channel error. This is consistent with
multiple tries.

I've tried using CachedDriverManagers / PooledDriverManagers, but this will
result in a NullPointerException when I tried to use its PlcConnection
object to create a PlcWriteRequest.Builder. Essentially, the "builder"
object is null:

[image: image.png]

However, I'm able to create PlcReadRequest builders for reading data; no
NullPointerExceptions:

This is how I'm creating the CachedDriverManager:
[image: image.png]

I've noticed that I will never encounter a maximum buffer limit reached for
connections created from the CachedDriverManager, used to make Modbus read
requests. Hence, I considered using connections created from the
CachedDriverManger to make Modbus write requests, however I get a
NullPointerException for the "builder".

Hope you could help point me in the right direction, been stuck at this for
a couple of days.

Thanks!
Regards,
Max