OsMessageObject

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osMessageObject(key primID, string message)
primID = the UUID of the prim you are messaging.

message = The string you want to send.

Sends a message to a prim identified by the given UUID, a script in the prim must implement the dataserver event handler. the dataserver event is passed the UUID of the calling prim and a string message.

This is incompatible with the normal use of dataserver event on scripts on the receiving prim.
The dataserver query_id argument should be a unique id of a request. This function just uses it as a sender id. All scripts with dataserver event will receive it with no easy to validate. A normal request may also trigger the event on several scripts of the prim. The target one can compare the query_id and validate it, other scripts can not tell if it is a normal request for other script, or a message.
this unless the prims can know senders UUIDs and filter based on them

Threat Level Low
Permissions ${OSSL|osslParcelOG}ESTATE_MANAGER,ESTATE_OWNER
Extra Delay 0 seconds
Example(s)
This example consists of a sender script, and a receiver script.
Sender script
// ----------------------------------------------------------------
// Example / Sample Script to show function use.
//
default
{
    state_entry()
    {
        llSay(0, "Touch me to use osMessageObject to message an object");
    }
    touch_end(integer total_num)
    {
        key kTargetObj = "UUID"; //INSERT A VALID Object UUID here
        string sSentence = "This message sent from a Sending object using osMessageObject";
        osMessageObject(kTargetObj,sSentence);
    }
}


Receiver script
// Place this script in the Receiver prim.
default
{
    state_entry()
    {
        llSay(0, "osMessageObject Receiver Ready\nPlease replace UUID in osMessageObject Script (line 31) kTargetObj = "+(string)llGetKey());
    }
    dataserver(key query_id, string data)
    {
        llSay(0, "RECEIVER: The message received.\n\t query_id = "+(string)query_id+"\n\t msg = "+data);
    }
}
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