⚡ Optimize Modbus polling with batched reads#22
⚡ Optimize Modbus polling with batched reads#22zknpr wants to merge 1 commit intosecurity-fixes-and-community-prsfrom
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Replaces the N+1 read pattern with batched Modbus requests for contiguous addresses. Supports up to 125 registers or 2000 bits per request, significantly reducing transaction overhead. Ensures alignment by using a `uint16_t` buffer. Verified with `unit-test-server` for correctness and performance. Co-authored-by: zknpr <96851588+zknpr@users.noreply.github.com>
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Based on older code. Would conflict with v1.5.3 improvements. Batch reads optimization could be reimplemented on current base if needed. |
I have rebased the optimization onto |
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Based on older code. Would conflict with v1.5.3 improvements. Batch reads optimization could be reimplemented on current base(branch v1.5.3) if needed. |
Thank you for the note. My changes only affect the reading loop in |
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Clarification for Jules: The main branch is now |
Thank you for the clarification. I have now rebased my changes onto the |
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Hi Jules, the branch still has conflicts with v1.5.3. The merge-base shows it's based on Could you please rebase onto the actual v1.5.3 branch? The v1.5.3 branch has 8 additional commits including:
Please ensure your batch reads optimization preserves all these improvements. Thank you! |
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Update: The PRs cannot be reopened because they target To properly submit your changes, please create new PRs targeting the Steps:
The v1.5.3 branch contains 8 commits beyond security-fixes-and-community-prs that must be preserved. Thank you! |
Apologies for the confusion. I have performed a hard reset and rebased directly onto |
Optimizes Modbus polling with batched reads for contiguous addresses: - Batches up to 125 registers or 2000 bits per request - Uses uint16_t buffer for proper alignment - Reduces transaction overhead significantly - Preserves all v1.5.3 improvements (signal handler, security fixes) Includes benchmark.sh for performance testing. Merged from: origin/batch-reads-optimization-14003233585538614312 Original PR: #22 by google-labs-jules[bot] Co-Authored-By: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>
💡 What:
The optimization groups contiguous Modbus register or coil requests into a single Modbus transaction, respecting protocol limits (125 registers or 2000 bits).
It iterates through the user-requested list (
-rreferences), identifies contiguous sequences, performs a single read operation, and then unpacks the results to print them individually as before.🎯 Why:
Previously,
mbpollperformed one Modbus transaction for every single reference in the list. For a range like-r 1:100, this resulted in 100 separate Modbus transactions (N+1 query problem).This incurred significant overhead due to network latency (especially on RTU/Serial) and system calls.
📊 Measured Improvement:
On a local
unit-test-server(TCP loopback):On real hardware (Serial/RTU), the improvement will be even more dramatic due to physical latency.
Correctness was verified for:
PR created automatically by Jules for task 14003233585538614312 started by @zknpr