Group-Invitor with Sensor

At first you have to create a new prim to put these two scripts in, then edit: Range, Rate, BOT_KEY, BOT_GROUP and MASTER to your needs.

list visitor_list;

float range = 96.0; // in meters
float rate =  10.0; // in seconds

// Bot_LLUUID (status 3 gives you the Bot-Key)
//
key BOT_KEY=" >>> HERE <<< ";

// Die Gruppe in die der Bot einladen soll, einfach den Bot in die Gruppe einladen und dann "mygroups" aufrufen
//
key BOT_GROUP=" >>> HERE <<< ";

integer isNameOnList( string name )
{
    integer len = llGetListLength( visitor_list );
    integer i;
    for( i = 0; i < len; i++ )
    {
        if( llList2String(visitor_list, i) == name )
        {
            return TRUE;
        }
    }
    return FALSE;
}
 

default
{
    state_entry()
    {
        llSay(0, "Visitor List Maker started...");
        llSay(0, "The owner can say 'help' for instructions."); 
        llSensorRepeat( "", "", AGENT, range, TWO_PI, rate );
        llListen(0, "", llGetOwner(), "");
        
        // Eves
        //
        llMessageLinked(LINK_THIS, 0, (string)BOT_KEY +  "|members " + (string)BOT_GROUP, NULL_KEY);
    }
  
           
    sensor( integer number_detected )
    {
        integer i;
         
        for( i = 0; i < number_detected; i++ )
        {
            if( llDetectedKey( i ) != llGetOwner() )
            {
                string detected_name = llDetectedName( i );
               
                if( isNameOnList( detected_name ) == FALSE )
                {
                    visitor_list += detected_name;
                    
                    // Eves
                    //
                    llMessageLinked(LINK_THIS, 0, (string)BOT_KEY +"|invite " + (string)llDetectedKey(i) + " " + (string)BOT_GROUP, NULL_KEY);
                 }
            }
        }    
    }
    
    listen( integer channel, string name, key id, string message )
    {
        if( id != llGetOwner() )
        {
            return;
        }
        
        if( message == "help" )
        {
            llSay( 0, "This object records the names of everyone who" );
            llSay( 0, "comes within "+ (string)range + " meters." );
            llSay( 0, "Commands the owner can say:" );
            llSay( 0, "'help'  - Shows these instructions." );
            llSay( 0, "'say list'   - Says the names of all visitors on the list.");
            llSay( 0, "'reset list' - Removes all the names from the list." );
        }
        else
        if( message == "say list" )
        {
            llSay( 0, "Visitor List:" );
            integer len = llGetListLength( visitor_list );
            integer i;
            for( i = 0; i < len; i++ )
            {
                llSay( 0, llList2String(visitor_list, i) );
            }
            llSay( 0, "Total = " + (string)len ); 
        }
        else
        if( message == "reset list" )
        {
            visitor_list = llDeleteSubList(visitor_list, 0, llGetListLength(visitor_list));
            llSay( 0, "Done resetting.");
        }
    }        
}

// InstantMessage per llLinkedMessage
//
integer isKey(key in) {
    if (in) return 2;
    return (in == NULL_KEY);
}

default
{
        link_message(integer sender_num, integer num, string str, key id)
        {
            if (num != 0) { return; }
            list PARS;
            PARS = llParseString2List(str, ["|"], []);
            if (isKey(llList2Key(PARS,0))) {
//                llOwnerSay("debug => " + llList2String(PARS, 0) + " => " + llList2String(PARS, 1));
                llInstantMessage(llList2Key(PARS,0), llList2String(PARS, 1));
            }
        }
}