The NTP network time protocol is an application layer protocol in the TCP/IP protocol family. It is often used to synchronize the clock between the client and the server and provide high-precision time calibration. Since this service has a large amount of concurrency and does not require packet loss, it The transport layer generally uses UDP packets, and RS485 to TCP/IP converter TCP has mechanisms such as confirmation, retransmission, and blocking, which cause the transmission rate to be lower than that of UDP. Generally, the system uses port 123 as the NTP port by default.
NTP service can be used in scenarios such as network management, billing system, bank time service, collaborative processing, system time, and security authentication. These scenarios generally have high requirements for time accuracy. Key security also introduces a time stamp effective judgment mechanism, which constrains the validity period of the public key through time stamps. I don’t know the weather API uses this communication mechanism. Many network communications will check the system time for security, so there is a unified standard time It means a lot to the network.
NTP is a protocol used to synchronize the clocks of various hosts in the network. It shares the accurate Lorawan Node Outdoor Gateway time of major timing centers around the world with devices, and its accuracy can reach within 1 millisecond in the intranet, and within tens of milliseconds on the Internet. .