Event Listening with Olympe

gerald · January 17, 2020, 11:56am

Hello,

I searched in the documentation and the forum but I didn’t find a way to listen events (beside the expectation mechanism). Is it something possible with Olympe ?

It would be very convenient to listen either for all events or for a specific list to do actions accordingly.

I saw on the documentation events like battery alerts, motor error, wifi signal and so on. With a listener, I would be able to add some security scenarios.
Unless there is another way to do it without a listener ?

Thanks in advance.
Gerald

ndessart · February 12, 2020, 9:30am

Hi gerald,

This feature has already been requested multiple times and the good news is that this listener feature should be included in the next Olympe release.

Nicolas

gerald · February 12, 2020, 9:51am

Hello Nicolas,

Thank you for your answer. That’s a good news.
Is there already a target date for the next Olympe release ?

Gerald

ndessart · February 12, 2020, 10:25am

End of February at best but the schedule depends on the GSDK 1.2.0 and Anafi 1.6.5 release date (those must be synchronized).

Nicolas

ndessart · March 27, 2020, 4:04pm

Hi,

Olympe 1.2.0 has a new event monitoring API. You should probably have a look at the following examples:

github.com

Parrot-Developers/olympe/blob/master/src/olympe/doc/examples/listener.py

# -*- coding: UTF-8 -*-

import olympe
from olympe.messages.ardrone3.Piloting import TakeOff, Landing, moveBy
from olympe.messages.ardrone3.PilotingState import (
    PositionChanged,
    SpeedChanged,
    AttitudeChanged,
    AltitudeAboveGroundChanged,
    AlertStateChanged,
    FlyingStateChanged,
    NavigateHomeStateChanged,
)


olympe.log.update_config({"loggers": {"olympe": {"level": "WARNING"}}})


def print_event(event):
    # Here we're just serializing an event object and truncate the result if necessary

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github.com

Parrot-Developers/olympe/blob/master/src/olympe/doc/examples/subscriber.py

# -*- coding: UTF-8 -*-

import olympe
from olympe.messages.ardrone3.Piloting import TakeOff, Landing, moveBy
from olympe.messages.ardrone3.PilotingState import FlyingStateChanged
from pprint import pformat

olympe.log.update_config({"loggers": {"olympe": {"level": "WARNING"}}})
drone = olympe.Drone("10.202.0.1")
# subscribe to all events during the drone connection
with drone.subscribe(
    lambda event, controller: print("{}({})".format(event.message.fullName, pformat(event.args)))
):
    drone.connect()

# Subscribe to FlyingStateChanged
# If you call `drone.subscribe` without using the `with` statement,
# you'll have to call `drone.unsubscribe()` later.
flying_sub = drone.subscribe(
    lambda event, controller: print("Flyingstate =", event.args["state"]), FlyingStateChanged()

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Nicolas

gerald · March 27, 2020, 4:55pm

That’s a very good news !
Thank you for updating the post.