Pressure
Device Compatibility
Overview
The Pressure driver reports values for:
- Pressure
- Altitude
- Temperature
Based on component location, the temperature values from the Humidity driver are recommended over the Pressure driver
Available ZeroMQ Ports
Base port: 20025Keep-alive port: 20026Error port: 20027Data Update port: 20028
Protocol
Base Port
This port accepts 2 configurations for communicating with the Pressure driver.
-
delay_between_updates- controls the output speed of messages from the Data Update port. -
timeout_after_last_ping- stops sending messages from the Data Update port if nothing has been sent to the Keep-alive port after the specified amount of seconds.
message DriverConfig { // Delay between updates in seconds float delay_between_updates = 1; // Timeout after last ping float timeout_after_last_ping = 2;
Keep-alive Port
This driver needs keep-alive messages in order to send data to your application. It's recommended to send an empty string "" because the contents of a keep-alive message are never read.
Error Port
Applications can subscribe to this port to receive driver related errors.
Data Update Port
Applications can subscribe to this port for pressure data. The output will be a serialized message of type Pressure with the following information.
message Pressure { // Pressure float pressure = 1; // Altimeter float altitude = 2; // Temperature float temperature = 3; }