Article Type:
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How To
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Product:
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Symphony
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Product Version:
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Component:
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Symphony Server
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Device Brands:
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Created:
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7-Apr-2017 10:35:52 AM
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Last Updated:
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Trigger an alarm in Symphony with a TCP message
You can use the TCP Listener video analytic to trigger alarms in Symphony. When the TCP Listener receives a message with metadata, it triggers the alarm. - In the Symphony server configuration interface, click Rules > Events.
- Click New Event.
- Type a name for the event.
- Add a camera to the event.
- Select TCP Listener as the video analytic.
- Select whether you want any metadata or specific metadata to trigger an alarm.
- If you select specific metadata, type the text.
For example, select Alarm on metadata that contains and type Hello World. - Click Save.
You can test the alarm by sending a TCP message to the Symphony server. The following steps use Netcat to send the TCP message and tests an alarm that triggers on the text "Hello World". Note: The cat and netcat utilities are Unix utilities. To use these utilities on Windows, use Cygwin (https://www.cygwin.com/) or Bash on Windows (https://msdn.microsoft.com/en-us/commandline/wsl/about) for Windows 10 Anniversary Update build 14393 (64-bit) or later. Alternatively, you can use a computer or virtual machine running Linux. To test your alarm, perform the following steps: - Create a text file (for example: message.txt) that contains
<metadata text="Hello World"></metadata>
- Send the message to the Symphony server. For example:
cat message.txt | netcat ip_address camera_id_value
Where ip_address is the IP address of the Symphony and camera_id_value is the value of the camera ID on which you have created the alarm. For example, if the camera ID in Symphony is 5, the camera ID value is 5 * 10 + 50003 = 50053. If the camera ID in Symphony is 10, the camera ID value is 10 * 10 + 50003 = 50103.
The message should trigger the rule in Symphony and cause the action set for that rule to activate. The following example, written in Python, sends TCP messages to Symphony:
#!/usr/bin/env python
import socket
TCP_IP = 'ip_address' TCP_PORT = port BUFFER_SIZE = 1024 MESSAGE = '<metadata text="Hello World"></metadata>'
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TCP_IP, TCP_PORT)) s.send(MESSAGE) s.close()
Where ip_address is the IP addres of the Symphony Server and port is the port number on which the Symphony Server listens for TCP messages (50003 + (camera ID * 10) by default).
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