Sending custom MAVLink commands in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to send a custom MAVLink command using the drone object.

Drone Programming

drone.[1](command_long_encode(0, 0, command_id, 0, param1, param2, param3, param4, param5, param6, param7))

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Asend_mavlink

Bdisconnect

Cconnect

Dreceive_mavlink

Attempts:

3 left

💡 Hint

Common Mistakes

Using receive_mavlink instead of send_mavlink

Trying to connect or disconnect instead of sending commands

The send_mavlink method is used to send custom MAVLink commands to the drone.

2fill in blank

medium

Complete the code to import the MAVLink command encoder function.

Drone Programming

from pymavlink.dialects.v20 import common as mavlink
command_long_encode = [1]

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Amavlink.MAVLink_command_long_encode

Bmavlink.MAVLink_command_short_encode

Cmavlink.MAVLink_heartbeat_encode

Dmavlink.MAVLink_param_request_read_encode

Attempts:

3 left

💡 Hint

Common Mistakes

Using command_short_encode which is for short commands

Using heartbeat or param request functions by mistake

The MAVLink_command_long_encode function encodes the long command message needed to send custom commands.

3fill in blank

hard

Fix the error in the code to correctly send a MAVLink command with parameters.

Drone Programming

drone.send_mavlink(command_long_encode(0, 0, [1], 0, 1, 2, 3, 4, 5, 6, 7))

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AMAV_CMD_DO_CHANGE_SPEED

BMAV_CMD_NAV_TAKEOFF

CMAV_CMD_COMPONENT_ARM_DISARM

DMAV_CMD_DO_SET_MODE

Attempts:

3 left

💡 Hint

Common Mistakes

Using a navigation command instead of an arm/disarm command

Using a mode set command without proper parameters

MAV_CMD_COMPONENT_ARM_DISARM is a common command to arm or disarm the drone, often used with parameters.

4fill in blank

hard

Fill both blanks to create a dictionary of commands with their parameter count.

Drone Programming

commands = { [1]: 7, [2]: 3 }

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AMAV_CMD_DO_SET_MODE

BMAV_CMD_NAV_LAND

CMAV_CMD_COMPONENT_ARM_DISARM

DMAV_CMD_NAV_TAKEOFF

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up commands and their parameter counts

Using commands that don't fit the parameter counts given

MAV_CMD_DO_SET_MODE typically uses 7 parameters, and MAV_CMD_NAV_LAND uses 3 parameters.

5fill in blank

hard

Fill all three blanks to filter commands with 5 or more parameters.

Drone Programming

filtered = {cmd: params for cmd, params in commands.items() if params [1] 5 [2] cmd != [3]

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A>

B>=

Cand

DMAV_CMD_NAV_LAND

Attempts:

3 left

💡 Hint

Common Mistakes

Using '>' instead of '>=' which excludes commands with exactly 5 parameters

Not excluding the land command properly

The filter keeps commands with parameters greater or equal to 5 and excludes the land command.