[Bug]: Multi-Item writes don't seem to work on S7 devices

[chrisdutz]

What happened?

When running the updated ManualTest against my S7 device, which now also does multi-item write requests against the device, the test fails on the first multi-item write.

Version

v0.13.0-SNAPSHOT

Programming Languages

• [X] plc4j
• [ ] plc4go
• [ ] plc4c
• [ ] plc4net

Protocols

• [ ] AB-Ethernet
• [ ] ADS /AMS
• [ ] BACnet/IP
• [ ] CANopen
• [ ] DeltaV
• [ ] DF1
• [ ] EtherNet/IP
• [ ] Firmata
• [ ] KNXnet/IP
• [ ] Modbus
• [ ] OPC-UA
• [X] S7

[chrisdutz]

Capture of the rest only testing multi item writes.

s7-driver-multi-item-write-error.pcapng.zip

[chrisdutz]

Investigating into this issue shows that it's probably a problem related to the optimzizer building too large PDUs