activateAddons

Be aware that addon's string is the CfgPatches class of the desired addon to preload.

This command will activate addons that are referenced via scripts but not included in a missions required addons section. If executed from a configs init event with the call command, it will effectively override a missions required addons, preventing them from being activated (Appears to only happen in multi player). To activate the passed addons along with those defined in the mission.sqm, execute the command from a configs init event using spawn or execVM.

Here is a handy function to call before you do createVehicle or other create* command during missing init scripts, which should activate missing addons without having to worry about re-adding previously added addons.

fnc_prepareClassAddons = {
    private _class = toLower _this;

    // To avoid double checks
    if(isNil"var_addonCheckedClasses") then {var_addonCheckedClasses = createHashMap;};
    if(_class in var_addonCheckedClasses) exitWith {};

    // Finding missing addons
    private _needed = unitAddons _class apply {toLower _x};
    private _active = activatedAddons;
    private _missing = _needed - (_needed arrayIntersect _active);
    if(count _missing > 0) then {
        // Adding everything again, engine will figure it out itself
        _active append _missing;
        activateAddons _active;
    };

    var_addonCheckedClasses set [_class, _needed];
};

Usage would be "Land_BurntGarbage_01_F" call fnc_prepareClassAddons.