Article directory
Preface
With the popularity of smart electric vehicles around the world, automotive Ethernet is increasingly used in automotive networks, and the TCP protocol is also a commonly used protocol. There is also a lot of information on the TCP checksum calculation method on the Internet, such as: Python, Java Calculation methods in other languages, but CAPL language is mostly used in the automotive industry, and there is relatively little information in this area. Therefore, this article mainly shares how CAPL language calculates TCP checksum.
What is a checksum?
The checksum is a field that exists in various messages. Its purpose is to verify the integrity of the message during network transmission (some data may have 0-1 data flips during link transmission, resulting in packet loss). text error). Therefore, at the sending end of the message, a checksum is calculated based on the header or data in the message, and then once the receiving end receives the corresponding message, the