Documentation Index
Fetch the complete documentation index at: https://docs.hologram.io/llms.txt
Use this file to discover all available pages before exploring further.
Outbound (from device)
Messages take the form of a binary payload (usually UTF8-encoded text), and an optional list of topic strings that you can use for filtering or routing in the cloud. By configuring routing rules, you can forward messages to other internet services. This means you can update where the Data Router sends your messages without deploying code updates to your cellular devices.Embedded API overview
Learn how to publish messages from firmware using the Embedded API
Data router topics and messages
Learn about Data Router topics and messages
Inbound (to device)
Hologram exposes an API and a Dashboard interface to send TCP or UDP messages to any port on your cellular device. This requires that your device run embedded Linux or otherwise implements a networking stack. We then translate the API requests — or messages sent using your dashboard — into raw TCP/UDP messages and send them to the desired SIM.Dashboard
Send TCP or UDP messages to any port on your device from your dashboard
REST API
Send TCP or UDP messages to any port on your device using the REST API