pysml
Python library for EDL21 smart meters using Smart Message Language (SML)
Decision gist · record as of 2026-08-14
Yes, if you need to read EDL21 smart meters. The library is actively maintained, has low install friction, carries no known vulnerabilities, and is proven in Home Assistant. MIT license is unrestrictive. Main consideration: ensure your meter model and transport method are supported, and your Python environment is 3.11 or later.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.11 or later; meter must be accessible via serial, serial-over-TCP, or HTTP.
- Low install friction with a pure-Python wheel distribution.
- Actively maintained with a recent release 75 days ago.
License · maintenance · safety
MIT (permissive) — MIT license permits commercial and private use with minimal restrictions—suitable for most projects.
last release 2026-05-31 (75 days)
0 known vulnerabilities (OSV.dev, 2026-08-14) · 77,848 downloads/mo, #14,488 on PyPI
Alternatives
Verify before relying
pip install pysml
import pysml
# Read SML data from serial port, serial-over-TCP, or HTTP endpoint
# See examples/sml-mqtt-bridge.py for MQTT publishing pattern- Whether aiohttp, bitstring, and serialx are stable and well-maintained for production use.
- Performance characteristics when reading from high-frequency meter streams or concurrent connections.
- Completeness of SML protocol support and compatibility with specific meter models.
- Whether example code for MQTT publishing is production-ready or demonstration-only.
What it is and what it does
pysml is a Python library that reads and decodes Smart Message Language (SML) protocol data from EDL21 smart electricity meters. It abstracts away low-level SML parsing and provides access to OBIS meter values. The library supports multiple transport mechanisms—direct serial connections, serial-over-TCP bridges, and HTTP endpoints—making it flexible for different deployment scenarios.
The package is actively used by Home Assistant's EDL21 integration and includes example code for publishing meter readings to MQTT. It depends on aiohttp, bitstring, and serialx for async HTTP, binary protocol handling, and serial communication. With MIT licensing and support for Python 3.11 through 3.14, it suits home automation, energy monitoring, and utility data collection workflows.
Use it for
- Read energy consumption data from EDL21 meters in Home Assistant or other home automation systems.
- Build an MQTT bridge to publish smart meter OBIS values to a message broker for real-time monitoring.
- Collect meter readings over serial-over-TCP links in remote or networked meter deployments.
- Parse and log SML protocol data from HTTP-accessible meter endpoints for analytics or billing systems.
- Integrate smart meter data into custom Python applications for demand-side energy management.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes, if you need to read EDL21 smart meters.
The library is actively maintained, has low install friction, carries no known vulnerabilities, and is proven in Home Assistant. MIT license is unrestrictive. Main consideration: ensure your meter model and transport method are supported, and your Python environment is 3.11 or later.
Install
pysml on PyPI
Before you install
Low install friction with a pure-Python wheel distribution. Actively maintained with a recent release 75 days ago. Requires Python 3.11 or later.
Requires Python 3.11 or later; meter must be accessible via serial, serial-over-TCP, or HTTP.
License in practice
MIT license permits commercial and private use with minimal restrictions—suitable for most projects.
Quickstart
pip install pysml
import pysml
# Read SML data from serial port, serial-over-TCP, or HTTP endpoint
# See examples/sml-mqtt-bridge.py for MQTT publishing patternVerify before relying
- Whether aiohttp, bitstring, and serialx are stable and well-maintained for production use.
- Performance characteristics when reading from high-frequency meter streams or concurrent connections.
- Completeness of SML protocol support and compatibility with specific meter models.
- Whether example code for MQTT publishing is production-ready or demonstration-only.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release <4.0,>=3.11 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 3 packagesaiohttpbitstringserialx |
| Maintenance | Actively maintained 75 days since the last release |
| First released | |
| Downloads | 77,848 / month, #14,488 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Programming Language :: Python :: 3Programming Language :: Python :: 3.11Programming Language :: Python :: 3.12Programming Language :: Python :: 3.13Programming Language :: Python :: 3.14 |
Evidence: pysml-0.1.8-py3-none-any.whl
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