Project Summary
Pymodbus is a full Modbus protocol implementation using a synchronous or asynchronous (using asyncio) core.
Supported modbus communication modes: tcp, rtu-over-tcp, udp, serial, tls
Pymodbus can be used without any third party dependencies (aside from pyserial) and is a very lightweight project.
Pymodbus also provides a lot os ready to use examples as well as a server/client simulator which can be controlled via REST Api and can be easily integrated into test suites.
Requires Python >= 3.8
The tests are run against Python 3.8, 3.9, 3.10 on Windows, Linux and MacOS.
In a Nutshell, Pymodbus-old...
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has a well established, mature codebase
maintained by a large development team
with decreasing Y-O-Y commits -
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took an estimated 5 years of effort (COCOMO model)
starting with its first commit in November, 2008
ending with its most recent commit 3 days ago
BSD 4-clause (University of California-Specific)
Permitted
Commercial Use
Modify
Distribute
Place Warranty
Forbidden
Hold Liable
Use Trademarks
Required
Include Copyright
Include License
These details are provided for information only. No information here is legal advice and should not be used as such.
Project Security
Vulnerabilities per Version ( last 10 releases )
There are no reported vulnerabilities
Project Vulnerability Report
Security Confidence Index
Vulnerability Exposure Index
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30 Day SummaryMay 16 2026 — Jun 15 2026
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12 Month SummaryJun 15 2025 — Jun 15 2026
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