MAVSDK build from source gtest:gcmock error

MAVSDK
1

Hello, I had cmake 16.3 installed on my jetso device. I installed cmake 19.3.0 for mavsdk and tried to compile mavsdk, but I get the error below. Can you help me with this?
@JulianOes
– All plugins enabled
– BUILD_MAVSDK_SERVER not set: not building grpc mavsdk_server
– Configuring done
CMake Error at src/integration_tests/CMakeLists.txt:5 (add_executable):
Target “integration_tests_runner” links to target “GTest::gmock” but the
target was not found. Perhaps a find_package() call is missing for an
IMPORTED target, or an ALIAS target is missing?

CMake Error at src/unit_tests/CMakeLists.txt:3 (add_executable):
Target “unit_tests_runner” links to target “GTest::gmock” but the target
was not found. Perhaps a find_package() call is missing for an IMPORTED
target, or an ALIAS target is missing?
CMake Error at src/system_tests/CMakeLists.txt:1 (add_executable):
Target “system_tests_runner” links to target “GTest::gmock” but the target
was not found. Perhaps a find_package() call is missing for an IMPORTED
target, or an ALIAS target is missing?
– Generating done
CMake Generate step failed. Build files cannot be regenerated correctly.

2

Try with configure option: -DBUILD_TESTING=OFF.

Also see: Build From Source Failure (Raspbian OS) · Issue #2374 · mavlink/MAVSDK · GitHub

3

Thanks for your feedback, yes I was able to build it this way. Now I am facing a new problem. I have a code that I tried to read rc channels with mavsdk. With this code I can get channel values ​​with stil(arducopter) but when I connect to a real system and run the code

Request message 242 again using REQUEST_MESSAGE (retries: 1) (mavlink_request_message.cpp:75)
[11:30:59|Debug] MAVLink: info: EKF3 IMU1 tilt alignment complete (system_impl.cpp:243)
[11:30:59|Debug] MAVLink: info: EKF3 IMU0 tilt alignment complete (system_impl.cpp:243)
[11:31:00|Warn ] Request message 242 again using REQUEST_MESSAGE (retries: 2) (mavlink_request_message.cpp:75)
[11:31:01|Warn ] Request message 242 again using REQUEST_MESSAGE (retries: 3) (mavlink_request_message.cpp:75)
[11:31:04|Debug] Request message 242 using REQUEST_MESSAGE (mavlink_request_message.cpp:78)
[11:31:05|Warn ] Request message 242 again using REQUEST_MESSAGE (retries: 1) (mavlink_request_message.cpp:75)
I’m getting this message
“”"
auto system = mavsdk.first_autopilot(3.0);
if (!system) {
cerr << “Timed out waiting for system\n”;
return 1;
}
Telemetry telemetry{system.value()};
MavlinkPassthrough mavlink_passthrough{system.value()};

mavlink_passthrough.subscribe_message(
    MAVLINK_MSG_ID_RC_CHANNELS,
    [](const mavlink_message_t& message) {
        mavlink_rc_channels_t channel_output;
        mavlink_msg_rc_channels_decode(&message, &channel_output);
        cout << "RC Kanal 8: " << channel_output.chan8_raw << endl;
        int leptonChannelValue = channel_output.chan8_raw;
        checkLeptonStatus(leptonChannelValue);
    });

while (true) {
    this_thread::sleep_for(std::chrono::seconds(1));
}"""

This is my code that I tried to read mavlink messages. I would be very happy if you could help me, thanks in advance.

4

You can ignore the request message warnings. That just means that MAVSDK wasn’t able to request certain messages.

5

Thank you for your feedback and help. But I can’t read or see the RC channel values. My aim is to read the values ​​of the RC channels and perform operations accordingly, but since I can’t read the value of the RC channel, I can’t perform the operation. I wonder if there is a deficiency in my code. I’m not sure.

6

Are RC messages actually sent out? If not, you will have to enable this.

I don’t know how this is generally done for ArduPilot, but you can try to send this command (also via mavlink_passthrough):