[MadeMan]

From NPC to GM:
SendCommand -> OnPlayerCommandText

From GM to NPC:
SendClientMessage -> OnClientMessage

Example:

NPC:

pawn Код:

public OnNPCSpawn()
{
    SendCommand("/npcspawn");
    return 1;
}

GM:

pawn Код:

public OnPlayerCommandText(playerid, cmdtext[])
{
    if(IsPlayerNPC(playerid))
    {
        if(strcmp(cmdtext, "/npcspawn", true) == 0)
        {
            SendClientMessage(playerid, -1, "/talk");
            return 1;
        }
        return 0;
    }
    return 0;
}

NPC:

pawn Код:

public OnClientMessage(color, text[])
{
    if(strcmp(text,"/talk", true) == 0)
    {
        SendChat("I just spawned");
        return 1;
    }
    return 1;
}