---
id: solace-pubsubplus
version: "1.11.0"
license: Apache 2.0
license_treatment: permissive
maintenance: aging
---

# solace-pubsubplus — Solace Messaging API for Python.

License: permissive · Maintenance: aging · Downloads: 265.2K/mo

## What it is and what it does

Solace Messaging API for Python is a client library that connects Python applications to Solace Event Brokers. It provides four primary abstractions: MessagingService (connection management), MessagePublisher (direct or persistent send), MessageReceiver (direct or persistent receive), and Message (payload wrapper). The library supports two delivery modes—direct messaging for low-latency fire-and-forget patterns, and persistent messaging for guaranteed delivery even when receivers are offline. Messages can be queued on the broker and acknowledged by receivers.

The package is built on platform-specific wheels for macOS, Linux (x86_64 and ARM), and Windows, with no external runtime dependencies. It requires Python 3.6 or later and cannot coexist with Python's multiprocessing module in the same application. The API is maintained by Solace Corporation and documented at docs.solace.com.

Use it for:

- Build event-driven microservices that publish and subscribe to topics on a Solace Event Broker.
- Implement reliable message queuing where offline receivers can retrieve stored messages upon reconnection.
- Create low-latency pub-sub applications using DirectMessagePublisher for messages that don't require persistence.
- Integrate Python applications into existing Solace messaging infrastructure for enterprise event streaming.
- Develop multi-pattern messaging workflows combining direct and persistent delivery in the same application.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

Solace Messaging API for Python provides client access to Solace Event Brokers, enabling publish-subscribe and queued message delivery patterns with support for both direct (fire-and-forget) and persistent (guaranteed) messaging.

Yes, if you are already using or planning to deploy Solace Event Brokers and need Python client connectivity. The library is production-stable, permissively licensed, and has no runtime dependencies. However, the aging maintenance status (252 days since last release) and the multiprocessing incompatibility are real constraints—verify that your deployment model and Python patterns align before committing.

## Install

pip install solace-pubsubplus
uv add solace-pubsubplus
poetry add solace-pubsubplus

## Installing solace-pubsubplus

Before you install: Medium install friction due to platform-specific wheels (macOS, Linux, Windows, ARM variants). No runtime dependencies to manage. Maintenance status is aging—252 days since last release—though the package is marked Production/Stable and supports current Python versions.

License in practice: Apache 2.0 is permissive; you can use this package in commercial and proprietary projects with minimal restrictions, provided you include a copy of the license and note any modifications.

Quickstart:

pip install solace-pubsubplus

from solace.messaging.messaging_service import MessagingService
from solace.messaging.publisher.message_publisher import DirectMessagePublisher

service = MessagingService.builder().build()
service.connect()
publisher = service.create_direct_message_publisher_builder().build()
publisher.publish(message, destination)

Python 3.6 or greater required. Cannot be used in applications that use the Python multiprocessing module.

Verify before relying:

- Exact feature parity and performance characteristics compared to other Solace SDKs or competing message brokers.
- Whether the aging maintenance status (252 days) reflects active support or reduced development velocity.
- Community adoption and real-world production usage patterns beyond download counts.

## Package facts

- License: Apache 2.0 (permissive)
- Python support: supports_current
- Install friction: medium
- Maintenance: aging
- Downloads: 265.2K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

solace messaging client, event broker python, publish subscribe messaging, persistent message queue, solace pubsub api, message publisher receiver, event-driven messaging, event-broker, message-queue, pub-sub

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