Hello fellow OpenHAB enthusiasts! I recently encountered a frustrating issue with my OpenHAB setup, and I wanted to share my journey to resolution in case it helps others facing similar challenges. Here’s my story:### The ProblemI upgraded my OpenHAB system to version 4.3.2 on a clean installation, hoping to benefit from the latest features. However, after a few days of operation, the system would unexpectedly crash. The logs indicated issues with the Modbus TCP poller, particularly when polling a TCP/RTU converter for solar inverter data. The system would stop responding to item updates and event logging, leaving me puzzled and concerned.### Initial InvestigationsI started by reviewing the logs and noticed recurring errors related to Modbus transactions. The system would fail to match transaction IDs between requests and responses, leading to connection resets. I suspected this might be related to the addition of MQTT bindings for temperature sensors, but the problem persisted even after removing them.### Troubleshooting Steps1. Log Analysis: I meticulously reviewed the logs to identify patterns. The errors were consistent, pointing to Modbus communication issues.2. Poller Configuration: I adjusted the poller settings, adding timeBetweenTransactionsMillis=200 to reduce polling frequency. Unfortunately, this didn’t resolve the issue.3. Binding Isolation: I temporarily disabled non-essential bindings to isolate the problem. The issue remained, indicating it was specific to the Modbus setup.4. Community Support: I reached out to the OpenHAB community for insights. Several users suggested checking the Modbus configuration and ensuring compatibility with the latest firmware.### The SolutionAfter extensive research and experimentation, I discovered that the issue was related to the Modbus slave’s response timing. The slave device was not responding within the expected timeframe, causing transaction mismatches. To address this, I implemented the following changes:1. Increased Timeout Values: I adjusted the connectTimeoutMillis and timeBetweenTransactionsMillis settings to allow more time for slave responses.2. Slave ID Configuration: Ensuring the slave ID was correctly set in the Modbus configuration proved crucial for stable communication.3. Firmware Updates: Updating the Modbus slave firmware to the latest version resolved underlying compatibility issues.### OutcomeThese adjustments have been transformative. My OpenHAB system has been running smoothly without crashes for over a week now. The solar inverter data is reliably polled, and all items update correctly. It’s a relief to have a stable system again!### Final ThoughtsThis experience underscored the importance of thorough log analysis and community support in troubleshooting complex issues. By methodically testing each potential cause and applying targeted fixes, I was able to restore my system’s functionality. I hope this account helps others facing similar challenges and reinforces the value of persistence in problem-solving.Happy automating, and here’s to a crash-free future for all our OpenHAB setups!