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Getting Started Pub/Sub

A complete real-time messaging starter project featuring a Harper application with MQTT, WebSocket, and Server-Sent Events (SSE) capabilities, plus client examples in multiple languages.
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Repo
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Getting Started Pub/Sub

Ivan R. Judson, Ph.D.
Distinguished Solution Architect
at Harper
December 12, 2025
Ivan R. Judson, Ph.D.
Distinguished Solution Architect
at Harper
December 12, 2025
Ivan R. Judson, Ph.D.
Distinguished Solution Architect
at Harper
December 12, 2025
December 12, 2025
A complete real-time messaging starter project featuring a Harper application with MQTT, WebSocket, and Server-Sent Events (SSE) capabilities, plus client examples in multiple languages.
Ivan R. Judson, Ph.D.
Distinguished Solution Architect
INDEX
Open as PDF
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SIMILAR RESOURCES
Tutorial
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The Easiest Way to Use MQTT: A Hands-On Demo with Harper’s Built-In Broker

Learn how MQTT works and see a real-time demo using Harper’s built-in MQTT broker. Discover topics, Pub/Sub, QoS, retained messages, and how Harper simplifies IoT and edge data workflows. Watch how to publish, subscribe, and store sensor data instantly with an easy, developer-friendly setup.
Harper Learn
Tutorial
Dec 2025

The Easiest Way to Use MQTT: A Hands-On Demo with Harper’s Built-In Broker

Learn how MQTT works and see a real-time demo using Harper’s built-in MQTT broker. Discover topics, Pub/Sub, QoS, retained messages, and how Harper simplifies IoT and edge data workflows. Watch how to publish, subscribe, and store sensor data instantly with an easy, developer-friendly setup.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Tutorial
Dec 2025

The Easiest Way to Use MQTT: A Hands-On Demo with Harper’s Built-In Broker

Learn how MQTT works and see a real-time demo using Harper’s built-in MQTT broker. Discover topics, Pub/Sub, QoS, retained messages, and how Harper simplifies IoT and edge data workflows. Watch how to publish, subscribe, and store sensor data instantly with an easy, developer-friendly setup.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Icon representing link to external content
Tutorial
Dec 2025

The Easiest Way to Use MQTT: A Hands-On Demo with Harper’s Built-In Broker

Learn how MQTT works and see a real-time demo using Harper’s built-in MQTT broker. Discover topics, Pub/Sub, QoS, retained messages, and how Harper simplifies IoT and edge data workflows. Watch how to publish, subscribe, and store sensor data instantly with an easy, developer-friendly setup.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Ivan R. Judson, Ph.D.
Recent News
News
Oct 2026

Harper Names Lelah Manz Chief Executive Officer

Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Harper
Harper
Harper
Harper
News
Aug 2026

Harper Recognized as an Honorable Mention in the 2026 Gartner® Magic Quadrant™ for Cloud-Native Application Platforms

Harper’s inclusion highlights a broader shift toward integrated cloud-native platforms that unify data, caching, messaging, and application logic. The article explains how Harper’s distributed runtime and managed infrastructure reduce operational complexity, improve performance, and support modern applications and AI agents that require fast, reliable access to state, events, and tools.
Aleks Haugom
Aleks Haugom
Aleks Haugom
Aleks Haugom
A complete real-time messaging starter project featuring a Harper application with MQTT, WebSocket, and Server-Sent Events (SSE) capabilities, plus client examples in multiple languages.

Download

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A complete real-time messaging starter project featuring a Harper application with MQTT, WebSocket, and Server-Sent Events (SSE) capabilities, plus client examples in multiple languages.

Download

White arrow pointing right
A complete real-time messaging starter project featuring a Harper application with MQTT, WebSocket, and Server-Sent Events (SSE) capabilities, plus client examples in multiple languages.

Download

White arrow pointing right

Explore Recent Resources

Blog
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Bring Your Whole Stack Together Around Salesforce Commerce Cloud

Complex storefronts can outgrow SPCC native hosting. Harper connects the systems around SFCC to speed up shopping and protect sales.
Digital Commerce
Blog
Complex storefronts can outgrow SPCC native hosting. Harper connects the systems around SFCC to speed up shopping and protect sales.
Person with short dark hair and moustache, wearing a colorful plaid shirt, smiling outdoors in a forested mountain landscape.
Aleks Haugom
Senior Manager of GTM
Blog

Bring Your Whole Stack Together Around Salesforce Commerce Cloud

Complex storefronts can outgrow SPCC native hosting. Harper connects the systems around SFCC to speed up shopping and protect sales.
Aleks Haugom
Oct 2026
Blog

Bring Your Whole Stack Together Around Salesforce Commerce Cloud

Complex storefronts can outgrow SPCC native hosting. Harper connects the systems around SFCC to speed up shopping and protect sales.
Aleks Haugom
Blog

Bring Your Whole Stack Together Around Salesforce Commerce Cloud

Complex storefronts can outgrow SPCC native hosting. Harper connects the systems around SFCC to speed up shopping and protect sales.
Aleks Haugom
Case Study
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How Harper Modernized a Retail Website with 94% Less Engineering Effort and 85% Lower Cost

See how Harper’s unified runtime and supervised AI agents modernized a production storefront while engineers retained control of quality and releases.
Digital Commerce
Case Study
See how Harper’s unified runtime and supervised AI agents modernized a production storefront while engineers retained control of quality and releases.
Colorful geometric illustration of a dog's head resembling folded paper art in shades of teal and pink.
Harper
Case Study

How Harper Modernized a Retail Website with 94% Less Engineering Effort and 85% Lower Cost

See how Harper’s unified runtime and supervised AI agents modernized a production storefront while engineers retained control of quality and releases.
Harper
Oct 2026
Case Study

How Harper Modernized a Retail Website with 94% Less Engineering Effort and 85% Lower Cost

See how Harper’s unified runtime and supervised AI agents modernized a production storefront while engineers retained control of quality and releases.
Harper
Case Study

How Harper Modernized a Retail Website with 94% Less Engineering Effort and 85% Lower Cost

See how Harper’s unified runtime and supervised AI agents modernized a production storefront while engineers retained control of quality and releases.
Harper
News
GitHub Logo

Harper Names Lelah Manz Chief Executive Officer

Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Announcement
News
Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Colorful geometric illustration of a dog's head resembling folded paper art in shades of teal and pink.
Harper
News

Harper Names Lelah Manz Chief Executive Officer

Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Harper
Oct 2026
News

Harper Names Lelah Manz Chief Executive Officer

Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Harper
News

Harper Names Lelah Manz Chief Executive Officer

Former Akamai executive brings enterprise platform expertise to Harper’s next chapter, as co-founder Stephen Goldberg continues on the board.
Harper
System Architecture
GitHub Logo

API Caching and Personalization

Run recommendation logic close to shoppers and reuse product data across regions with Harper.
Cache
System Architecture
Run recommendation logic close to shoppers and reuse product data across regions with Harper.
Colorful geometric illustration of a dog's head resembling folded paper art in shades of teal and pink.
Harper
System Architecture

API Caching and Personalization

Run recommendation logic close to shoppers and reuse product data across regions with Harper.
Harper
Oct 2026
System Architecture

API Caching and Personalization

Run recommendation logic close to shoppers and reuse product data across regions with Harper.
Harper
System Architecture

API Caching and Personalization

Run recommendation logic close to shoppers and reuse product data across regions with Harper.
Harper
System Architecture
GitHub Logo

Shared Virtual Workouts for Connected Fitness

Bring live movement and saved progress together in Harper for responsive shared workouts and simpler regional growth.
Real-time
System Architecture
Bring live movement and saved progress together in Harper for responsive shared workouts and simpler regional growth.
Colorful geometric illustration of a dog's head resembling folded paper art in shades of teal and pink.
Harper
System Architecture

Shared Virtual Workouts for Connected Fitness

Bring live movement and saved progress together in Harper for responsive shared workouts and simpler regional growth.
Harper
Oct 2026
System Architecture

Shared Virtual Workouts for Connected Fitness

Bring live movement and saved progress together in Harper for responsive shared workouts and simpler regional growth.
Harper
System Architecture

Shared Virtual Workouts for Connected Fitness

Bring live movement and saved progress together in Harper for responsive shared workouts and simpler regional growth.
Harper
Comparison
GitHub Logo

Faster Vector Search in Harper 5.3 with Native HNSW

Explore vector index in Harper 5.3’s with benchmarks against pgvector and Harper 5.2, and the open-source Node.js package @harperfast/hnsw.
Comparison
Explore vector index in Harper 5.3’s with benchmarks against pgvector and Harper 5.2, and the open-source Node.js package @harperfast/hnsw.
Person with very short blonde hair wearing a light gray button‑up shirt, standing with arms crossed and smiling outdoors with foliage behind.
Kris Zyp
SVP of Engineering
Comparison

Faster Vector Search in Harper 5.3 with Native HNSW

Explore vector index in Harper 5.3’s with benchmarks against pgvector and Harper 5.2, and the open-source Node.js package @harperfast/hnsw.
Kris Zyp
Oct 2026
Comparison

Faster Vector Search in Harper 5.3 with Native HNSW

Explore vector index in Harper 5.3’s with benchmarks against pgvector and Harper 5.2, and the open-source Node.js package @harperfast/hnsw.
Kris Zyp
Comparison

Faster Vector Search in Harper 5.3 with Native HNSW

Explore vector index in Harper 5.3’s with benchmarks against pgvector and Harper 5.2, and the open-source Node.js package @harperfast/hnsw.
Kris Zyp
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