public OnPluginStart() 
{ 
     	HookUserMessage(GetUserMessageId("TextMsg"), Callback, true); 
	RegConsoleCmd("test", Command);
} 

public Action:Callback(UserMsg:MsgId, Handle:hBitBuffer, const iPlayers[], iNumPlayers, bool:bReliable, bool:bInit) 
{ 
	BfReadByte(hBitBuffer); 
	decl String:buffer[256]; 
	BfReadString(hBitBuffer, buffer, sizeof(buffer)); 
	PrintToServer("Hook=====>%s", buffer);
}   

public Action:Command(client, args) PrintToServer("TEST TEST");