How to send sms with a gsm modem Pool ?

GSM Modem Pool : You'll need a hardware device with multiple GSM modem slots (8-port,16-port,32 port ) and SIM cards for each modem. Computer: It will run the software that interacts with the modem pool and handles message sending. SMS Gateway Software: This software acts as a bridge between your application and the modem pool, allowing you to send and receive SMS messages. SIM Cards: Each modem needs a SIM card with sufficient credit for sending messages.

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1. Set up the modem pool: Follow the manufacturer's instructions to connect the modem pool to your computer via USB or serial cables. Power on the pool and ensure all SIM cards are properly inserted.
2. Install and configure the SMS Gateway software: Download and install the software on your computer. Follow the instructions to configure communication settings for your modem pool, including COM ports and baud rates.
3. Connect the software to the modem pool: Use the software's interface to discover and connect to the modem pool. You may need to autodetect ports or manually configure connection settings.
4. Test the connection: Send a test SMS from the software to a valid number. Verify that the message is successfully delivered and received.
5. Develop your application: Integrate the SMS Gateway software's API or command-line interface (CLI) into your application to send bulk SMS messages. You can use libraries or tools provided by the software for different programming languages.
6. Manage message queues and delivery: Implement logic to distribute messages across available modems in the pool, ensuring efficient delivery and preventing overloading. Monitor delivery reports and handle potential errors or failed messages.

This doesn't look like a GeoSCADA issue.  It looks like a problem with either your network, or your modem.

GeoSCADA is doing what I'd expect from it there.

Tx 16 bytes at 26-AUG- 10:43:34.642 to 10.9.17.53:
41 54 56 31 45 30 2B 43 4E 4D 49 3D 33 2C 32 0D ATV1E0+CNMI=3,2.

Rx ACCEPTED 39 bytes at 26-AUG- 10:43:34.751 from 10.9.17.53:
0D 0A 2B 43 4D 53 20 45 52 52 4F 52 3A 20 6F 70 ..+CMS ERROR: op
65 72 61 74 69 6F 6E 20 6E 6F 74 20 73 75 70 70 eration not supp
6F 72 74 65 64 0D 0A .. .. .. .. .. .. .. .. .. orted..

Tx 18 bytes at 26-AUG- 10:43:44.751 to 10.9.17.53:
41 54 56 31 45 30 2B 43 53 43 53 3D 22 47 53 4D ATV1E0+CSCS="GSM
22 0D .. .. .. .. .. .. .. .. .. .. .. .. .. .. ".

Tx 18 bytes at 26-AUG- 10:43:57.773 to 10.9.17.53:
41 54 56 31 45 30 2B 43 53 43 53 3D 22 47 53 4D ATV1E0+CSCS="GSM
22 0D .. .. .. .. .. .. .. .. .. .. .. .. .. .. ".

You NEED to turn off the Incoming SMS Processing if your modem doesn't support it.

It appears that after Geo SCADA sends the +CNMI=3,2 request the modem dies.. 

Since the modem didn't say 'OK', then Geo SCADA retried to re-send... hence the duplicate message(s).

Tx 105 bytes at 02-SEP- 13:12:03.197 to 10.9.17.53:
41 6C 61 72 6D 20 57 61 73 74 65 20 57 61 74 65 Alarm Waste Wate
72 2E 52 65 67 69 6F 6E 73 2E 43 65 6E 74 72 61 r.Regions.Centra
6C 20 52 65 67 69 6F 6E 2E 42 4C 41 43 4B 50 4F l Region.BLACKPO
4F 4C 20 52 4F 41 44 20 57 57 50 53 2E 42 4C 41 OL ROAD WWPS.BLA
43 4B 50 4F 4F 4C 20 52 4F 41 44 20 57 57 50 53 CKPOOL ROAD WWPS
2E 44 4E 50 11 53 75 6D 70 31 2E 53 75 6D 70 20 .DNP.Sump1.Sump
4F 76 65 72 66 6C 6F 77 1A .. .. .. .. .. .. .. Overflow.

Want more information on 8-port SMS gateway modem? Feel free to contact us.

Tx 1 bytes at 02-SEP- 13:12:09.471 to 10.9.17.53:
1B .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .

Tx 1 bytes at 02-SEP- 13:12:10.702 to 10.9.17.53:
1B .. .. .. .. .. .. .. .. .. .. .. .. .. .. .. .

Tx 23 bytes at 02-SEP- 13:12:11.932 to 10.9.17.53:
41 54 2B 43 4D 47 53 3D 22 2B 32 37 37 33 32 39 AT+CMGS="+
35 35 38 37 30 22 0D .. .. .. .. .. .. .. .. .. ".

Tx 23 bytes at 02-SEP- 13:12:13.172 to 10.9.17.53:
41 54 2B 43 4D 47 53 3D 22 2B 32 37 37 33 32 39 AT+CMGS="+
35 35 38 37 30 22 0D .. .. .. .. .. .. .. .. .. ".

Geo SCADA did the right thing again here...  the modem was responding correctly up until the end of message token (1B) to which the SMS paging modem should have responded with +CMSG: xxx (to let the terminal know that the message has been successfully queued for sending with the message ID xxx).  Since the modem didn't respond AT ALL to this... then Geo SCADA tried to send the message again (with the AT+CMGS...).  The modem didn't respond.

So... I'd say that something changed with your modem configuration between:

02-SEP- 09:49:21.030

and

02-SEP- 10:14:28.576

Like someone enabled some other SMS mode in the router/modem (as mentioned by someone else in this thread, some router/modems let you configure SMS sending on a Digital Input.  This almost never works in conjunction with AT SMS usage).

Often the little controller that interfaces to the actual cellular modem has some very basic state machine around AT command parsing.  So if you enabled SMS send on digital input, or enabled SMS processing in the router itself, then it's little state machine starts to look for SMS related messages on the AT port (i.e. +CMGS), and will swallow them itself rather than send them out the AT 'serial port'.

Comms to the router/modem is working fine.  But the router/modem is behaving strangely around SMS.

NOTE: it's confusing with terminology.  There is a small cellular module within the device you've bought.  That is the actual 'modem'.  Wrapped around that is some custom electronics (typically with its own microcontroller) that does the non-cellular modem stuff... like the pretty web interface, and often the actual routing functionality... but it also does the SMS sending for digital state change, or the processing to allow for reset / etc by sending the router an SMS.

Lead Control Systems Engineer for Alliance Automation (VIC).
All opinions are my own and do not represent the opinions or policies of my employer, or of my cat..

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