ttns stands for "Trouble-Ticket & Notification Service". It's generally used for sending emails and/or sending a notification to a service like AlarmPoint. I don't believe you need to use ttns scripts to get messages in the gui event browser.
Create a message policy For Ex: To Capture Test : Application=Test Add the node to Node bank assign the node to node bank Make sure you have the right permission to view the messages deploy the policy to the node
Run opcmsg command: opcmsg a=Test o=Test msg_grp=OpC msg_t="Test Message from agent"
You can also run this command with ovdeploy.. ovdeploy -cmd "..." -node