SIM900 GPRS TCP/IP AT Commands 

Sir, did you solve this problem?

Yes, pause is needed for each command to be processed by GSM module. Provide sufficient delay or use wait for response code to wait for module to get ready to accept next command. Don't forget to share and subscribe :)

Hi Adam, - Greetings from India. - Thank you very much for the appreciation :)

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0.0.0.0 means that value is not used. Server ignores that value and opens a socket on given port number for listening. Leaving it 0.0.0.0 means you are opening a server at 127.0.0.1:747 if that is the port number you selected. For accessing from outside world you need Public IP.

What network is yours?

Hi Gustavo Auyero, Thank you for the appreciation. You can use TCP/UDP/HTTP for retrieving data. You cannot connect without a static IP Because it keeps changing. Best way to do it is, Make the remote machine to update data to a intermediate server, Use free IOT servers available like Carriots and then get data from there whenever needed. If you can explain me the exact setup like which kind of machine or system is being used, and are you reading from a microcontroller through SIM900 to a PC, and what are the constraints. I can suggest better. Drop me a mail at ravi@valetron.com

Greetings from India. Yes SIM800 and SIM900 have same commands. Glad it helped you. Don't forget to subscribe. :)

Thanks max. Glad it helped. Not sure about the exact difference. SIMCOM suggests AT+CSTT while dealing with TCP connections and AT+SAPBR while using HTTP and FTP connections as seen in their application notes. They have this option for running as a client or server in TCP mode but client only in HTTP mode and there is a MUX selection option where in you can have multiple connections to different servers at a time. So may be CSTT enables us to have multiple connections using TCP/UDP but SAPBR kind of restricts us with single HTTP/FTP connection mode. Am just guessing and i have a dropped a mail to SIMCOM support person and if they reply i will definitely let you know :)

Ok, I see. Thank you, your supposition make sense and I will appreciate your feedback if SIMCOM will response you. I try to do some TCP connection with SIM800 at my office but it didn't work. Maybe because, behind my wifi router, there are other switches, devices and security services which bloc external connections.

Hi Lukasz, You can send message to IP and receive back when the connection is still established by the client/module. You cannot initiate the connection from PC/server. If you are trying to make SIM900 as server, its little problematic. Watch my video on using SIM900 as TCP server.

Hi Amit, It is due to the server port not being open or there is a firewall on the server which is not allowing your module to connect.

Thanks for quick response. Can you please help me with the solution of the problem

No, it will not be ideal as 2g speed is limited. If you keep connection open always on TCP then you can send about every 5 seconds for consistent results. Otherwise data will be lost. Don't forget to like share and subscribe :)

@@RaviPujar what about 4g?

Hi Javad, Please post your query here. www.embeddedadvice.com/ We can discuss Dont forget to share and subscribe :)

same problem for me

Your public ip is the router ip. Your PC is behind the router and is not visible publicly. Your PC has virtual IP not real IP.

I dont think it will work through WiFi as it will be a shared IP. Unless you have a static IP or have port forwarding kind of feature on your router it wont work. .

Hi Deigo, Greetings from India :) Thank you for the appreciation. Glad you liked it. I suggest HTTP because you can easily send data to URL or end points using GET and POST requests. Look at my HTTP tutorials on SIM900 and GL865. I show how you can collect data using a PHP website in GL865 tutorial. There you can write simple code to save that to database. Alternatively you can use ready servers like Dreamfactory which provide ready to use endpoints for collecting and processing data. Just send your data in requests and it will be automatically saved in table you want. If you want asynchronous instructions to be received then you have to maintain a TCP connection open always, like in MQTT (Check out my tutorial on MQTT using SIM800) you can easily subscribe to a topic which can send instructions anytime. On HTTP you have to send data and wait for response for sent data, In this response you can pass your instruction or command to device. But you need to send data regularly or poll regularly to get instructions in time. And, Dont forget to Subscribe and share :)

Thanks Ravi! :)Suscribed!

Hi, Could you please post here with details www.embeddedadvice.com/ , with data capture/screenshots. We can discuss Dont forget to Subscribe :)

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I havent tried it but you need to use the same procedure but use base64 encoding for sending data as it is binary. And have your receiving side decode it back to binary. Also there is option for sending binary data using multipart file upload protocol. You should find it in HTTP protocol documentation for sending correct content type parameters for binary data.

Thank you :) No, I only use Windows, Never came across MAC.

Yes you can. Explain your setup and how everything is connected. Drop a email at ravi@valetron.com I will try to answer.

I am Working on GPRS Wireess Communication from One station to Another Station. I want to send some bunch of data from Client GPRS Module and Recieve it on other side connected Server. In Your Tutorial You made your PC as a Server No, my Doubt is that may i Make Some Micro Controller based Server which can ehave as My Server instead of PC.

NAT maybe..

Glad you liked it. Don't forget to like share and subscribe 😊

Hi, Thank you for watching. I havent worked on M590E. Please post your query here. www.embeddedadvice.com If someone has worked on it. They will reply. Dont forget to share and subscribe :)

+Fahimul Islam it means that the connection is closed on the server. Or you might be connecting to a ip which is not unique or which is shared between many computers like a LAN

+Ravi Pujar can you please provide any solution? Any kind of solution would be big help. Thanx.

+Indrajeet Javeri May be your socket timed out. Depends on which server you are using. SocketTest server doesnt time out.

+Ravi Pujar I used your HTTP tutorial to get HTTP Request from a webpage.I got that correctly.But this TCP Connect fails.Anyways since i only needed HTTP Requests that problem is solved.Thanks

Greetings from India. You are welcome. :)

+Shashank Mishra Hi , Before trying with SIM module first try to connect with socket test to your server, if it is able to connect then you can try connecting with the module.

Hi, If your CIICR command ran succesfully and got an IP address on CIFSR then you should not have this problem. Check these two commands again. Make sure to have balance on SIM card or a data pack.

+Ghugan cena (cenation619) Hi, Thank you , It means that the socket is not open on the server side. Some servers have a time out , so when a socket is opened it automatically closes after few seconds if no any data is sent.

+Ravi Pujar SIR i am having same problem.whatshould ido to tackle it

There could be multiple reasons for that. First make sure you are connected to internet by checking the IP address and then also check if your server is not behind any firewall. And also you can use SocketTest as a client to test your server operation.

yes im having the same problem and something is wrong with my public ip address (which i got from google) . 103.195.141.4 . without sim900 , i can't even connect socket test's client tab with server Tab with that ip. but google says that my ip . how to find that im behind any firewall or anything ...?? please please

You can do port scan by an online tool here www.ipfingerprints.com/portscan.php And check if that particular port is open on given IP. If you are behind firewall the tool will not show that port as open. Its just a guess. You can give it a try.

that tool sounds like not open at all but i did opened my port on socket test. after fiber_optic_cable there's a media converter and a router in my house > then my pc .. As im affected with their firewall , would you please teach mme how to usce TCP/IP in this situation ??? with pleasure

I have no idea how to get past through that. Many of the routers come with port forwarding where you can forward packets coming to your router to a particular port to a particular IP address on LAN when multiple systems are sharing the same public IP address. Check you router administrator panel. There might be a option for port forwarding.

Which words its not showing? Dont forget to share and Subscribe :)

The link is fine. Click on show more. and click on link. If you copy paste it then you will copy the truncated URL with dots at the end.

Got it, thank you.

So this happened because i was connecting to the network at my place of work and there were firewall settings that were blocking it. You need to turn the firewall off of the server running SocketTest

Thank you Paras , Dont forget to share and subscribe :)

If you are connecting Arduino to SIM900 then you need to translate the voltage levels to 2.8V on SIM900 side using voltage level translator like TXS0102.

AT+CIPSTART=“TYPE” , “domain”, “port” how to use port .I don't know it error. I use in program arduino serial moniter because take in car.

Pere Aranega Teruel Thank you for watching. Don't forget to subscribe :)

yes you can use, In this video all address used are IPV4. Dont forget to subscribe :)

Hi, Thanks for watching :) Dont forget to share and subscribe :)

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@@RaviPujar Sure Man. Can we create a server on sim808 by not using sim900 or it's just the problem with network providers?

@@gautamahuja7469 You can't use it as server without private network and static ip.

Make sure you are connected to network and IP address is correctly allocated before trying that command.

yes IP is allocated to network can i get your email address so that i can mail you snapshots of it

ravi@valetron.com

thank you sir but issue is solved just now the problem is withe google.com I tried some ip from m2m support and worked

Tysm for your quick replies

Yes Rakesh, I will try.

Most of the time its the server that closes it due to preset timeout on inactivity. GSM modules themselves dont close it unless there is a network problem. Thanks for watching and Dont forget to share and Subscribe :)

thank you so much

I guess it's internal ID generated by itself, don't depend on it. Don't forget to share and subscribe :)

thank you

Welcome :)

Tran Duc Khoa Thank you for watching. Don't forget to subscribe :)

Hi, when i use AT+CIPSTART... my module shuting down! can help me to find what happend? (vbat=3.84-3.89v 2A with ts2976, net lines 80mil exacly same as sim800's datasheet's (v1.2) power supply chematic)

Ha ha, Good observation 😀

If you have technical questions, you can ask here, www.embeddedadvice.com Please ask in english so that i can answer correctly. Dont forget to share and subscribe :)

In TMFT there is option to capture data. You can save data coming to terminal to a file. Don't forget to Share and Subscribe :)