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Fix visual studio warning C4819: The file contains a character that cannot be represented in the current code page. It makes errors while building AirSim.

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Jul 1, 2019
Jun 20, 2020

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This is a python implementation of the MAVLink protocol. It includes a source code generator (generator/ to create MAVLink protocol implementations for other programming languages as well. Also contains tools for analizing flight logs.


Please see for mavlink command reference.

For realtime discussion please see the pymavlink gitter channel

Examples can be found in the repository or in the ArduSub book


Pymavlink supports both python2 and python3.

The following instructions assume you are using Python 2 and a Debian-based (like Ubuntu) installation.


Pymavlink has several dependencies :

- [future]( : for python 2 and python 3 interoperability 
- [lxml]( : for checking and parsing xml file 
- python-dev : for mavnative
- a C compiler : for mavnative

Optional :

- numpy : for FFT
- pytest : for tests

On linux

lxml has some additional dependencies that can be installed with your package manager (here with apt-get) :

sudo apt-get install gcc python-dev libxml2-dev libxslt-dev

Optional for FFT scripts and tests:

sudo apt-get install python-numpy python-pytest

Using pip you can install the required dependencies for pymavlink :

sudo pip2 install -U future lxml

The -U parameter allows updating future and lxml version if it is already installed.

On Windows

Use pip to install future as for linux. Lxml can be installed with a windows installer from here :


For users

It is recommended to install pymavlink from PyPi with pip, that way dependencies should be auto install by pip.

sudo pip2 install -U pymavlink

The -U parameter allow to update pymavlink version if it is already installed.


By default, pymavlink will try to compile and install mavnative which is a C extension for parsing mavlink. Mavnative only supports mavlink1. To skip mavnative installation and reduce dependencies like gcc and python-dev, you can pass DISABLE_MAVNATIVE=True environment variable to the installation command:

sudo DISABLE_MAVNATIVE=True pip2 install -U pymavlink

For developers

From the pymavlink directory, you can use :

sudo MDEF=PATH_TO_message_definitions pip2 install . -v

Since pip installation is executed from /tmp, it is necessary to point to the directory containing message definitions with MDEF. MDEF should not be set to any particular message version directory but the parent folder instead. If you have cloned from mavlink/mavlink then this is /mavlink/message_definitions . Using pip should auto install dependencies and allow you to keep them up-to-date.


sudo python2 install


pymavlink is released under the GNU Lesser General Public License v3 or later.

The source code generated by generator/ is available under the permissive MIT License.

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