ros2 run .. --ros-args is not working

edit

I managed to make it work with an int parameter. This is what I did:

int n;
this->declare_parameter<int>("param", 0);
this->get_parameter_or("param", n, 0);

And then use: ros2 run pkg_name exe_name --ros-args param:=1.

So it was important to specify the parameter type.

Nevertheless, I had a problem with string parameters, so I surrounded the 2 functions with a try-catch:

try {
    this->declare_parameter<std::string>("calib", "no");
    this->get_parameter_or("calib", calib, std::string("no"));
}
catch (std::exception e) {
    std::cout << e.what() << "\n";
}

And I found out a strange behaviour: if I use

ros2 run pkg_name exe_name --ros-args -p "calib:=yes"

I get an exception that says: parameter 'calib' has invalid type: expected [string] got [bool].

While using something else

ros2 run pkg_name exe_name --ros-args -p "calib:=ok"

The param is read correctly.

So it seems that true, false, yes and no are recognised as bool. In fact, using:

try {
    this->declare_parameter<bool>("calib", false);
    this->get_parameter_or("calib", calib, false);
}
catch (std::exception e) {
    std::cout << e.what() << "\n";
}

I can run correctly: ros2 run pkg_name exe_name --ros-args -p "calib:=yes", while having the inverse exception with "calib:=ok" .