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How to get NTP time in SIM868? for this question, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and feasible way.

What is NTP?

NTP is the Network time Protocol (Network Time Protocol), which is used to synchronize the time of various devices (such as PC, mobile phones) in the network.

In the computer world, time is very important. for example, for scientific research activities such as rocket launch, there is a very high demand for the unity and accuracy of time, according to the time of A computer or the time of B computer? NTP is used to solve this problem. NTP (Network Time Protocol, Network time Protocol) is a protocol used to synchronize the time of various computers in the network. Its purpose is to synchronize the computer clock to UTC UTC. Its accuracy can reach 0.1ms in the local area network and 1-50ms in most places on the Internet.

It enables computers to synchronize their servers or clock sources (such as quartz clock, GPS, etc.). It can provide high-precision time correction, and can use encryption confirmation to prevent virus protocol attacks.

Introduction in the SIM868 manual

Many NTP server IP addresses are no longer available. Here are some recommended ones.

210.72.145.44

Has failed.

202.120.2.101

Has failed.

Ntp1.aliyun.com

120.25.115.20

Aliyun, Shenzhen City, Guangdong Province

Available

Ntp2.aliyun.com

Ntp3.aliyun.com

Ntp4.aliyun.com

Ntp5.aliyun.com

Ntp6.aliyun.com

Ntp7.aliyun.com

203.107.6.88

Aliyun, Shenzhen City, Guangdong Province

Available

Cn.ntp.org.cn

223.113.97.99

Yangzhou Mobile, Jiangsu Province

Available, official website: NTP time service fast domain name service

More NTP available domain names can be found in the "IP Pool" on this official website.

133.100.11.8

Japan

Available

The first part of AT instruction flow, preparation work

AT

OK

Check to see if you can communicate properly

AT+CSQ

+ CSQ: 23Co0

OK

Check signal quality

It is easy to make mistakes when the signal quality is poor.

AT+CREG?

+ CREG: 0Pol 1

OK

Check whether GSM is registered successfully

AT+CGREG?

+ CGREG: 0Pol 1

OK

Check whether GPRS is registered successfully

AT+CGATT?

+ CGATT: 1

OK

View GPRS attachment status

The second part, synchronization command

AT+SAPBR=3,1, "CONTYPE", "GPRS"

OK

Configure host scenario 1

AT+SAPBR=3,1, "APN", "3GNET"

OK

Configure host scenario 1

AT+SAPBR=1,1

OK

Activate a GPRS context

AT+SAPBR=2,1

+ SAPBR: 1Jing 1, "10.64.228.99"

OK

Get load-bearing layer parameters

Make sure that the bearing layer is normal.

AT+CNTPCID=1

OK

Set the CID used by CNTP

AT+CNTP= "203.107.6.88", 8

OK

Set the NTP server and local time zone

NTP server IP address: 203.107.6.88

Local time zone: 8

AT+CNTP?

+ CNTP: 202.120.2.101

OK

Get NTP server address and time zone settings

This instruction can be omitted.

AT+CNTP

OK

+ CNTP: 1

Synchronize network time

Return

+ CNTP: 1

Indicates that the time has been synchronized successfully

AT+CCLK?

+ CCLK: "18Compact 06Compact 28recover12hand 09purl 2808"

OK

Get local time

Check to see if the time is synchronized successfully

AT+SAPBR=0,1OK closes the GPRS context so much for the answer to the question about how to obtain NTP time in SIM868. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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