3
SYSTEM DESCRIPTION
18
8027311 / V1-0/2022-04|SICK
O P E R A T I N G I N S T R U C T I O N S | TDC-E (Telematic Data Collector)
Subject to change without notice
Fig. 8:
WebSocket protocol
Legend
A
Client
B
WebSocket server
1
Initial handshake between client and server
2
Constantly open connection for bidirectional message transmission
•
WebSocket is a TCP/IP protocol that provides a constant open connection after an
initial WebSocket handshake between a client and a WebSocket server.
•
A WebSocket server is nothing more than an application that monitors a port of a
TCP/IP server that follows a specific protocol.
•
The WebSocket server is installed by the customer.
•
The WebSocket server can actively use the open connection and retrieve information
from the client without any previous requests.
•
The TDC-E has the role of data provider.
WebSocket
