SIM7020 Series_TCPIP_Application_Note

Application Simplify Communication SIM7020 Series_TCPIP_Application Note Version: 1.02 Release Date: December 27, 2018 Simplify Communication. www.simcom.com

Simplify Communication About Document Document Information SIM7020 Series_TCPIP_Application Note 1.02 Application Note Released/Confidential Document Title Version Document Type Document Status Revision History Revision Date 1.00 April 10, 2018 Owner Xiaolun Wang Status / Comments First Release. 1.01 April 18, 2018 Albert Meng Revised layout 1.02 Dec 27, 2018 Jiaxiang Wang Modify and add chapter 4 about TCPIP Application Jimmy Zhang which compatible with SIM800 serial modules. Add transparent mode Related Documents [1] SIM7020 Series AT Command Manual V1.02.pdf This document applies to the following products: Name Size (mm) Type Comments SIM7020E SIM7020G SIM7060G NB1 NB2 NB2+GNSS 17.6*15.7 17.6*15.7 24*24 Band 1/3/5/8/20/28 Band 1/2/3/4/5/8/12/13/17/18/19/20/25/26/28/66/70/71 Band 1/2/3/4/5/8/12/13/17/18/19/20/25/26/28/66/70/71 Copyrights This document contains proprietary technical information which is the property of SIMCom Wireless. Copying of this document and giving it to others and the using or communication of the contents thereof, are forbidden without express authority. Offenders are liable to the payment of damages. All rights reserved in the event of grant of a patent or the registration of a utility model or design. All specification supplied herein are subject to change without notice at any time. SIM7020 Series_TCPIP_Application Note Page 2 / 22

Simplify Communication Contents About Document ...................................................................................................................... 2 Document Information .............................................................................................................. 2 Revision History ......................................................................................................................... 2 Related Documents ................................................................................................................... 2 Contents ................................................................................................................................... 3 1 2 Purpose of this document ................................................................................................. 5 PDP Context Activation and Deactivation .......................................................................... 5 2.1 2.2 2.3 2.4 Auto-Activation ............................................................................................................. 5 APN Manual Configuration ............................................................................................ 5 DNS Parser and Ping ...................................................................................................... 6 Deactivation .................................................................................................................. 6 3 TCPIP Connection .............................................................................................................. 7 3.1 TCPIP Architecture ......................................................................................................... 7 3.2 TCP Client ...................................................................................................................... 7 3.3 UDP Connection ............................................................................................................ 7 3.4 Multiple Sockets ............................................................................................................ 8 Hex and ASCII Message ................................................................................................. 8 3.5 3.6 TCP ACK ......................................................................................................................... 8 3.7 Incoming Message Indication ........................................................................................ 9 3.8 3.9 3.10 Retention Scene when Module is Waked from PSM Mode ....................................... 9 Summary of Socket Error codes .................................................................................... 9 TCPIP Connection flow chart ....................................................................................... 10 4 TCPIP Application compatible with SIM800 serial module ................................................ 11 TCPIP Architecture ....................................................................................................... 11 4.1 TCP Client Connection ................................................................................................. 11 4.2 UDP Client Connection ................................................................................................ 12 4.3 UDP Extended Mode ................................................................................................... 12 4.4 4.5 Multi Connection......................................................................................................... 13 DNS Function ............................................................................................................... 14 4.6 4.7 Data Sending Related .................................................................................................. 14 Fixed Length Sending ....................................................................................... 14 4.7.1 SIM7020 Series_TCPIP_Application Note page3 / 22

Simplify Communication 4.8 4.8.1 4.8.2 4.7.2 4.7.3 4.7.4 Timed Sending ................................................................................................. 15 Select Data Transmitting Mode ....................................................................... 15 Query Data Transmitting Amount ................................................................... 15 Data Receiving Related ................................................................................................ 17 Receive Data Automatically ............................................................................. 17 Receive Data Manually .................................................................................... 17 GPRS States Exchange Related .................................................................................... 17 4.9 4.10 Connection Closing Related ........................................................................................ 19 Error Handling ............................................................................................................. 19 4.11 4.12 Transparent Mode ....................................................................................................... 19 4.12.1 What is Transparent Mode .............................................................................. 19 4.12.2 How to enable Transparent Mode .................................................................. 20 4.12.3 How to Establish Connection and Enter into Transparent Mode after Enable Transparent Mode ........................................................................................................... 20 4.12.4 How to Switch Between Data Mode and Command Mode ............................ 20 Contact ................................................................................................................................... 22 SIM7020 Series_TCPIP_Application Note page4 / 22

Simplify Communication 1 Purpose of this document Based on module AT command manual, this document will give an entire and complete concept and TCPIP architecture introduction. Developers could understand and develop application quickly and efficiently based on this Document. PDP Context Activation and Deactivation 2 Auto-Activation 2.1 AT Command AT+CPIN? AT+CSQ AT+CGREG? AT+CGACT? AT+COPS? AT+CGCONTRDP Description Check SIM card status Check RF signal Check PS service Activated automatically Check operator info CHN-UNICOM is operator’s name9 is NB-IOT network Get APN and IP address from network Response +CPIN:READY OK +CSQ: 20,0 OK +CGREG: 0,1 OK +CGACT: 1,1 OK +COPS: 0,0,"CHN-UNICOM",9 OK +CGCONTRDP: 1,5,"shnbiot","10.250.0.213.255. 255.255.0" OK 2.2 APN Manual Configuration AT Command AT+CFUN=0 Response +CPIN: NOT READY OK AT*MCGDEFCONT="IP","3GNET OK Description Disable RF Configure new APN SIM7020 Series_TCPIP_Application Note Page 5 / 22

" AT+CFUN=1 AT+CGREG? AT+CGCONTRDP Simplify Communication OK +CPIN: READY +CGREG: 0,1 OK +CGCONTRDP: 1,5,"3GNET","10.250.0.253.255.255.255.0" OK Enable RF Inquiry PS service Attached PS domain and got IP address automatically 2.3 DNS Parser and Ping AT Command AT+CDNSGIP="www.baidu.com" OK Response AT+CIPPING="61.135.169.121" +CDNSGIP: 1,"www.baidu.com","111.13.100.92" OK +CIPPING: 1,61.135.169.121,11,52 +CIPPING: 2,61.135.169.121,2,52 +CIPPING: 3,61.135.169.121,3,52 +CIPPING: 4,61.135.169.121,2,52 Description Got Baidu host name’s IP address using DNS parser Ping this IP address 2.4 Deactivation AT Command AT+CGACT=0,1 AT+CGACT? AT+CGCONTRDP Response OK +CGACT: 1,0 OK OK Description Deactivate #1 Inquiry #1 deactivated already IP address is released status, it’s SIM7020 Series_TCPIP_Application Note page6 / 22

Simplify Communication TCPIP Connection 3 3.1 TCPIP Architecture SIM7020 series modules support TCP client only. And the default socket interface is designed for multiple sockets with total different 5 s, which could be TCP or UDP socket. S I M 7 0 2 0 T C P I P id=0 id=1 id=2 id=3 id=4 Serve r Cellular Network (Figure1 TCPIP Architecture) 3.2 TCP Client AT Command AT+CSOC=1,1,1 Response +CSOC: 0 OK AT+CSOCON=0,5245,"116.247.119.165" OK OK AT+CSOSEND=0,0,”Hello World” AT+CSOCL=0 OK 3.3 UDP Connection AT Command AT+CSOC=1,2,1 Response +CSOC: 0 OK AT+CSOCON=0,5246,"116.247.119.165" OK AT+CSOSEND=0,0,”Hello World” OK Description Created one TCP socket, =0 Connected remote TCP server Send TCP data out Close socket Description Created one UDP socket, =0 Connected remote UDP peer Send UDP data out SIM7020 Series_TCPIP_Application Note page7 / 22

AT+CSOCL=0 3.4 Multiple Sockets Simplify Communication OK Close socket AT+CSOC=1,2,1 AT Command AT+CSOC=1,1,1 Response +CSOC: 0 OK +CSOC: 1 OK AT+CSOCON=0,5245,"116.247.119.165" OK AT+CSOCON=1,5246,"116.247.119.165" OK OK AT+CSOSEND=0,0,”Hello World” OK AT+CSOSEND=1,10,”3132333435” AT+CSOCL=0 OK OK AT+CSOCL=1 Description Created one TCP socket, =0 Created one UDP socket, =1 Connected remote TCP server Connected remote UDP peer Send TCP data out Send UDP data Close socket 0 Close socket 1 3.5 Hex and ASCII Message Command AT+CSOSEND=,, supports both Hex and Ascii code message. If is pure hex, the parameter must be configured correct bytes and must be even number. Also Incoming message from remote socket are printed in Hex code. 3.6 TCP ACK AT Command AT+CSOC=1,1,1 AT+CSOSENDFLAG=1 AT+CSOCON=0,5245,"116.247.119.16 5" AT+CSOSEND=0,0,”Hello World” AT+CSOCL=0 Response +CSOC:0 OK OK OK OK SEND: 0,11 OK Description Created one TCP socket, =0 Configure TCP ACK report Connected remote TCP server Send TCP data out, 11 bytes had been sent out successfully. Close socket SIM7020 Series_TCPIP_Application Note page8 / 22

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