The Hardrock-50 is a 50W power amplifier for amateur radio QRP transceivers. It has a display showing valuable information like the selected band, the SWR, power, temperature etc. Since I am using the HR50 in a remote station, I cannot directly access those information via the display.
However, the HR50 offers serial communication via a USB port. This project tries to solve this problem with the help of a separate, wifi enabled hardware display. It consists of the following two components:
* Heltec ESP32 board with display
* a python flask application, which represents the communication via the serial interface in the form of an API
* If wifi is unavailable or misconfigured, the device will show "No Wifi!" on the screen
* HTTP Errors will also displayed on the OLED
* When you key up your TRX and therefore the HR50, no serial communication is possible. The latest gathered information will still be displayed on the screen but there will be a "(!)" in the third row as an indicator for this situation.
You need a computer connected to the Hardrock-50 via USB, e.g. a Raspberry Pi. This system needs to be able to run Python and has to be connected to your network.
# Configuration
Open the file _hr50_rd_server.py_ and adapt the following lines to your environment:
```
serial_port = '/dev/ttyUSB0'
baud = 19200
```
# Execution
Executing this script will spawn a web server running on port 5000. This is not meant for production use and/or public exposure. Anyone able to access this server via the network can alter any settings on your HR50.
Run it as follows:
```
# cd server
# ./bootstrap.sh
```
# API Endpoints
There are two API endpoints available:
#### /exec_serial
This method allows you to send commands to the HR50. The commands can be taken from the HR50 operator's manual and do not require the trailing ";"
#### /exec_shell
This method allows you to execute shell commands on the server
#### /get_status
This method returns all avalable information in JSON