Startup & Logs

Startup
All modules can be started manually but it is preferred to use start_db_modules.py script. On DroneBridge for Raspberry Pi the startup of modules is done by the start_db service. The source code sits inside the root directory of the repository. The service can be updated/registered using:
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sudo cp /home/pi/DroneBridge/start_db /etc/init.d/start_db
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sudo update-rc.d -f start_db remove
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sudo update-rc.d start_db defaults
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The status of the DroneBridge modules can be checked using:
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sudo /etc/init.d/start_db [status|start|stop]
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or:
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service start_db [status|start|stop]
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Logs
Local logs when connected via ssh
Since it is a service, all logs will be written to the journal. The logs can be viewed using one of the following commands:
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journalctl -u start_db.service [-f for real-time]
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systemctl | grep start_db | less
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Local logs when access via SD-card
All DroneBridge modules log to syslog. In /DroneBridge/log/db_modules.log are all relevant log entries.
Remote real-time logging
Connect via TCP to the Raspberry Pi on port 1605 and you will receive realtime syslog logs. Forward the messages to your favourite log viewer like Syslog Watcher. Or use the provided Python 3 script below to output directly to console.
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import socket
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from time import sleep
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​
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UDP_PORT_SYSLOG_SERVER = 1605
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# Raspberry Pi IP when connected to GND station via WiFi: 192.168.2.1
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​
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if __name__ == '__main__':
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    sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
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    reconnect = True
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    while reconnect:
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        try:
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            sock.connect(('IP-OF-RPi', UDP_PORT_SYSLOG_SERVER))
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            reconnect = False
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        except ConnectionRefusedError:
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            print("Retrying")
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            sleep(1)
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​
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    while True:
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        try:
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            data = sock.recv(1024)
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            print(data.decode("utf-8"))
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        except KeyboardInterrupt:
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            break
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    socket.socket.close(sock)
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Contents

Startup

Logs

Local logs when connected via ssh

Local logs when access via SD-card

Remote real-time logging