### MAVLink Bridge and System Components Source: https://mavlink.io/en/services/image_transmission.html Example commands to start essential components for MAVLink communication and system control on a MAV. ```bash px_mavlink_bridge_udp & px_system_control --heartbeat & px_camera -o lcm & ``` -------------------------------- ### Run Illuminator Emulator Source: https://mavlink.io/en/services/illuminator.html Starts the illuminator emulator. Ensure Python 3 is installed. ```bash python3 illuminator.py ``` -------------------------------- ### Install Custom Pymavlink Libraries Source: https://mavlink.io/en/mavgen_python/index.html Install the generated MAVLink libraries for a custom dialect locally using the setup program. ```shell python setup.py install --user ``` -------------------------------- ### Compile C UDP Example with CMake Source: https://mavlink.io/en/mavgen_c/example_c_udp.html Compile the C UDP example using CMake, specifying the installation path for MAVLink. Ensure you are in the correct directory. ```sh cd examples/c cmake -Bbuild -H. -DCMAKE_PREFIX_PATH=$(pwd)/../../install cmake --build build ``` -------------------------------- ### Install Python 3 and Pip on Ubuntu Source: https://mavlink.io/en/getting_started/installation.html Ensure Python and Pip are installed on Ubuntu Linux before proceeding with MAVLink installation. ```bash sudo apt install python3 python3-pip ``` -------------------------------- ### MAVLink FTP URL Scheme Example Source: https://mavlink.io/en/services/ftp.html Example of a MAVLink FTP URL to download a resource from the current component. ```text mftp:///camera.xml ``` -------------------------------- ### Install Standard Pymavlink Source: https://mavlink.io/en/mavgen_python/index.html Install the standard MAVLink dialect libraries for MAVLink 1 and 2 using pip. ```shell pip install pymavlink ``` -------------------------------- ### Run C UDP Example Source: https://mavlink.io/en/mavgen_c/example_c_udp.html Execute the compiled C UDP example. By default, it listens on localhost:14550. Ensure a MAVLink-compatible system (like PX4 or ArduPilot) is running and publishing to this address. ```sh ./build/udp_example ``` -------------------------------- ### Example MAVLink Mission Plain-Text File Source: https://mavlink.io/en/file_formats/index.html An example of a mission file adhering to the QGC WPL format. Each line represents a waypoint with its associated parameters, separated by tabs. ```plaintext QGC WPL 110 0 1 0 16 0.149999999999999994 0 0 0 8.54800000000000004 47.3759999999999977 550 1 1 0 0 16 0.149999999999999994 0 0 0 8.54800000000000004 47.3759999999999977 550 1 2 0 0 16 0.149999999999999994 0 0 0 8.54800000000000004 47.3759999999999977 550 1 ``` -------------------------------- ### C UDP Example Output Source: https://mavlink.io/en/mavgen_c/example_c_udp.html This output shows the successful execution of the C UDP example, indicating that HEARTBEAT messages are being sent and received from a PX4 autopilot on localhost. ```sh ~/github/mavlink/mavlink/examples/c$ ./build/udp_example Sent heartbeat Got heartbeat from PX4 autopilot Sent heartbeat Got heartbeat from PX4 autopilot Sent heartbeat Got heartbeat from PX4 autopilot Sent heartbeat Got heartbeat from PX4 autopilot Sent heartbeat Got heartbeat from PX4 autopilot ... ``` -------------------------------- ### Install MAVLink Headers with CMake Source: https://mavlink.io/en/mavgen_c Installs MAVLink headers locally into an 'install' directory using CMake. This allows subsequent projects to find and use the library. ```shell cmake -Bbuild -H. -DCMAKE_INSTALL_PREFIX=install -DMAVLINK_DIALECT=common -DMAVLINK_VERSION=2.0 cmake --build build --target install ``` -------------------------------- ### MAV_CMD_LOGGING_START Source: https://mavlink.io/en/messages/common.html Requests to start streaming logging data over MAVLink. ```APIDOC ## MAV_CMD_LOGGING_START (2510) ### Description Request to start streaming logging data over MAVLink (see also LOGGING_DATA message). ### Parameters #### Path Parameters - **Format** (int) - Required - Format: 0: ULog. Values: min: 0 inc: 1 - **Reserved 2** (int) - Optional - Reserved (set to 0) - **Reserved 3** (int) - Optional - Reserved (set to 0) - **Reserved 4** (int) - Optional - Reserved (set to 0) - **Reserved 5** (int) - Optional - Reserved (set to 0) - **Reserved 6** (int) - Optional - Reserved (set to 0) - **Reserved 7** (int) - Optional - Reserved (set to 0) ``` -------------------------------- ### Install Required Python Packages Source: https://mavlink.io/en/getting_started/installation.html Install the necessary Python packages for MAVLink by referencing the requirements file in the pymavlink directory. ```bash python3 -m pip install -r pymavlink/requirements.txt ``` -------------------------------- ### MAVLink FTP URL Scheme with Component ID Example Source: https://mavlink.io/en/services/ftp.html Example of a MAVLink FTP URL to download a resource from a specific component (e.g., companion computer) by specifying its component ID. ```text mftp://;comp=100/camera.xml ``` -------------------------------- ### MAV_CMD_VIDEO_START_STREAMING Source: https://mavlink.io/en/messages/common.html Starts video streaming for a specified camera and stream ID. ```APIDOC ## MAV_CMD_VIDEO_START_STREAMING (2502) ### Description Start video streaming. ### Parameters #### Path Parameters - **Stream ID** (int) - Required - Video Stream ID (0 for all streams, 1 for first, 2 for second, etc.). Values: min: 0 inc: 1 - **Target Camera ID** (int) - Required - Target camera ID. 7 to 255: MAVLink camera component id. 1 to 6 for cameras attached to the autopilot, which don't have a distinct component id. 0: all cameras. This is used to target specific autopilot-connected cameras. It is also used to target specific cameras when the MAV_CMD is used in a mission. Values: min: 0 max: 255 inc: 1 ``` -------------------------------- ### Example Directory Listing Entries with Timestamps Source: https://mavlink.io/en/services/ftp.html Demonstrates the output format for directory listing when timestamps are included. Note the '0' for unknown timestamps. ```text FTestFile3.xml\t223\t1747459200\0FTestFile4.xml\t755568\t1746940800\0FTestFile5.xml\t11111\t0\0 ``` -------------------------------- ### Setup Message Signing with mavutil Source: https://mavlink.io/en/mavgen_python/message_signing.html Use the `setup_signing` method from `mavutil` to configure message signing for a connection. This method allows specifying a secret key, whether to sign outgoing messages, a callback for unsigned messages, an initial timestamp, and a link ID. If `link_id` or `initial_timestamp` are not provided, they are handled internally. ```python #Setup signing def setup_signing(self, secret_key, sign_outgoing=True, allow_unsigned_callback=None, initial_timestamp=None, link_id=None) ``` -------------------------------- ### Example Directory Listing Entries Source: https://mavlink.io/en/services/ftp.html Illustrates the output format for directory listing with multiple entries. ```text FTestFile3.xml\t223\0FTestFile4.xml\t755568\0FTestFile5.xml\t11111\0 ``` -------------------------------- ### Enum Definition Example Source: https://mavlink.io/en/guide/xml_schema.html Example of how to define an enum with multiple entries, including descriptions for the enum and each entry. This specific example defines LANDING_TARGET_TYPE. ```xml Type of landing target Landing target signaled by light beacon (ex: IR-LOCK) Landing target signaled by radio beacon (ex: ILS, NDB) Landing target represented by a fiducial marker (ex: ARTag) Landing target represented by a pre-defined visual shape/feature (ex: X-marker, H-marker, square) ``` -------------------------------- ### Configure Signing with Custom Unsigned Message Callback Source: https://mavlink.io/en/mavgen_python/message_signing.html Set up message signing using `mavutil.setup_signing`, providing a custom `allow_unsigned_callback` function to control which unsigned messages are accepted. This example allows `RADIO_STATUS` messages. ```python # Assuming you already have a connection set up the_connection = mavutil.mavlink_connection(...) # Create a callback to specify the messages to accept def my_allow_unsigned_callback(self,msgId): #Allow radio status messages if msgId==mavutil.mavlink.MAVLINK_MSG_ID_RADIO_STATUS: return True return False # Pass the callback to the connection (here we also pass an arbitrary secret key) secret_key = chr(42)*32 the_connection.setup_signing(secret_key, sign_outgoing=True, allow_unsigned_callback=my_allow_unsigned_callback) ``` -------------------------------- ### Install tcpdump on Linux Source: https://mavlink.io/en/guide/wireshark.html Installs the tcpdump utility on Debian-based Linux systems. This tool is used for capturing network traffic. ```bash apt update apt install tcpdump ``` -------------------------------- ### Start Image Streamer Component Source: https://mavlink.io/en/services/image_transmission.html Command to start the image streaming component on the MAV. The -v flag provides verbose output. ```bash px_imagestreamer # or with verbose output: px_imagestreamer -v ``` -------------------------------- ### MAVLink Enum Definition Example Source: https://mavlink.io/en/guide/define_xml_element.html This example defines the LANDING_TARGET_TYPE enum, which specifies different types of landing targets with descriptive entries and values. ```xml Type of landing target Landing target signaled by light beacon (ex: IR-LOCK) Landing target signaled by radio beacon (ex: ILS, NDB) Landing target represented by a fiducial marker (ex: ARTag) Landing target represented by a pre-defined visual shape/feature (ex: X-marker, H-marker, square) ``` -------------------------------- ### Find MAVLink Dependency in CMakeLists.txt Source: https://mavlink.io/en/mavgen_c Configures a CMake project to find the installed MAVLink library and link it to an executable. Requires the MAVLink installation prefix to be set. ```cmake find_package(MAVLink REQUIRED) add_executable(my_program my_program.c) target_link_libraries(my_program PRIVATE MAVLink::mavlink) ``` -------------------------------- ### Initialize Signing Structure Source: https://mavlink.io/en/mavgen_c/message_signing_c.html Initialize the `mavlink_signing_t` structure with secret key, link ID, timestamp, flags, and an optional callback for accepting unsigned packets. ```c mavlink_signing_t signing; memset(&signing, 0, sizeof(signing)); memcpy(signing.secret_key, key.secret_key, 32); signing.link_id = (uint8_t)chan; signing.timestamp = key.timestamp; signing.flags = MAVLINK_SIGNING_FLAG_SIGN_OUTGOING; signing.accept_unsigned_callback = accept_unsigned_callback; mavlink_status_t *status = mavlink_get_channel_status(chan); status.signing = &signing; ``` -------------------------------- ### MAVLink Message Definition Example Source: https://mavlink.io/en/guide/define_xml_element.html Example of a MAVLink message definition for 'SAFETY_SET_ALLOWED_AREA'. It shows the structure with ID, name, description, and fields with their types, names, and units. ```xml Set a safety zone (volume), which is defined by two corners of a cube. This message can be used to tell the MAV which setpoints/waypoints to accept and which to reject. Safety areas are often enforced by national or competition regulations. System ID Component ID Coordinate frame. Can be either global, GPS, right-handed with Z axis up or local, right handed, Z axis down. x position 1 / Latitude 1 y position 1 / Longitude 1 z position 1 / Altitude 1 x position 2 / Latitude 2 y position 2 / Longitude 2 z position 2 / Altitude 2 ``` -------------------------------- ### Set MAVLink Install Prefix for CMake Source: https://mavlink.io/en/mavgen_c Sets the CMake prefix path to locate the local MAVLink installation directory. This is necessary for the `find_package(MAVLink)` command to succeed. ```shell cd ../my_program cmake -Bbuild -H. -DCMAKE_PREFIX_PATH=../mavlink/install ``` -------------------------------- ### Camera Definition XML Example Source: https://mavlink.io/en/services/camera_def.html This XML file defines camera parameters, their types, default values, and relationships, including options, exclusions, and conditional ranges. ```xml T100 Foo Industries Camera Mode CAM_SHUTTERSPD CAM_ISO CAM_VIDRES White Balance Mode Exposure Mode CAM_SHUTTERSPD CAM_ISO Shutter Speed