DX Spots

May 17th, 2026. DX Spots is available in version 1.6.

Display spots submitted to PSK Reporter which are relayed by a MQTT Broker running on a high performance Akamia node.

Each spot consists of these fields:

• Sequence
• Frequency
• Band
• Mode
• Signal level
• Time stamp
• Sending station call, square, country
• Receiving station call, square, country

Note: The country is the ADIF country.

Spots are displayed as they arrive, currently no on-demand database.

MQTT Broker

An MQTT broker is a central component in the MQTT protocol, facilitating communication between devices in a publish/subscribe model. It acts as an intermediary, receiving messages from publishers and distributing them to subscribers based on topic filters. This architecture is widely used in IoT systems for its lightweight, scalable, and efficient communication.

Key Features of MQTT Brokers

• Message Routing: Brokers route messages from publishers to subscribers based on topics, ensuring efficient delivery without direct client connections.
• Scalability: MQTT brokers handle thousands to millions of simultaneous connections, making them ideal for IoT and M2M (Machine-to-Machine) communication.
• Security: They support authentication, encryption (e.g., SSL/TLS), and other security measures to protect data.
• Session Management: Brokers maintain client session states, ensuring message delivery even when clients reconnect.
• Integration: MQTT brokers integrate with cloud platforms (e.g., AWS IoT, Google Cloud IoT) and databases for seamless IoT solutions.