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[Bug]: Cached Modbus TCP hiccup when another connection is established

javaPull requests that update Java codePull requests that update Java code

Modbushttps://plc4x.apache.org/users/protocols/modbus.htmlhttps://plc4x.apache.org/users/protocols/modbus.html

Status: Open.

Bug

#2418 In apache/plc4x;

· JoelGaechter opened on Jan 12, 2026

[Bug]: NullPointerException

javaPull requests that update Java codePull requests that update Java code

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Bug

#2394 In apache/plc4x;

· JordanFromChina opened on Dec 15, 2025

[Bug]: some asymmetry in tag-handling

javaPull requests that update Java codePull requests that update Java code

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Bug

#2388 In apache/plc4x;

· DvonHolten opened on Dec 9, 2025

[Bug]: can't connect modbus-rtu

javaPull requests that update Java codePull requests that update Java code

Modbushttps://plc4x.apache.org/users/protocols/modbus.htmlhttps://plc4x.apache.org/users/protocols/modbus.html

Status: Open.

Bug

#2383 In apache/plc4x;

· HeyChangSha opened on Dec 9, 2025

[Feature Request]: better error message when data-content doesn't mach data-spec in S7

javaPull requests that update Java codePull requests that update Java code

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Feature

#2377 In apache/plc4x;

· DvonHolten opened on Dec 4, 2025

How does modbus-tcp read the string type defined by the plc?

javaPull requests that update Java codePull requests that update Java code

Modbushttps://plc4x.apache.org/users/protocols/modbus.htmlhttps://plc4x.apache.org/users/protocols/modbus.html

Status: Open.

Task

#2307 In apache/plc4x;

· yancyang1989-gif opened on Oct 15, 2025

[Bug]: Connection is not possible - Unable to find endpoint matching

javaPull requests that update Java codePull requests that update Java code

OPC-UAhttps://plc4x.apache.org/users/protocols/opcua.htmlhttps://plc4x.apache.org/users/protocols/opcua.html

Status: Open.

Bug

#2302 In apache/plc4x;

· fuzolan opened on Oct 9, 2025

[Bug]: When user and password is required to log in, but no user password is provided, the connection to opcua hangs.

OPC-UAhttps://plc4x.apache.org/users/protocols/opcua.htmlhttps://plc4x.apache.org/users/protocols/opcua.html

Status: Open.

Bug

#2290 In apache/plc4x;

· leibf2099 opened on Oct 3, 2025

[Bug]: Invalid lenByte - Issue connecting to Eclipse Milo OPC UA server with 4096-bit certificate using PLC4X SDK

OPC-UAhttps://plc4x.apache.org/users/protocols/opcua.htmlhttps://plc4x.apache.org/users/protocols/opcua.html

Status: Open.

Bug

#2286 In apache/plc4x;

· Skydreamer-123 opened on Oct 2, 2025

[Bug]: (S7-light) Issue when reading Db Addresses which are undefined

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Bug

#2266 In apache/plc4x;

· frankpuppa opened on Sep 18, 2025

[Bug]: S7 protocol leaks memory

javaPull requests that update Java codePull requests that update Java code

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Bug

#2248 In apache/plc4x;

· michele-tramonti opened on Sep 6, 2025

does plc4j-driver-s7 0.13.0 not support s7-200

S7https://plc4x.apache.org/users/protocols/s7.htmlhttps://plc4x.apache.org/users/protocols/s7.html

Status: Open.

Feature

#2247 In apache/plc4x;

· john1337 opened on Sep 6, 2025