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Summary

It is possible to connect the GSM modem to the RouterOS device and use it to send and receive SMS messages. RouterOS lists such modem as a serial port that appears in the '/port print' listing. GSM standard defines AT commands for sending SMS messages and defines how messages should be encoded in these commands. '/tool sms send' uses standard GSM AT commands to send SMS.

Sending

/tool sms send

Example

Sending command for ppp interface:

/tool sms send usb3 "" \ message="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#\$%^&*(){}[]\"'~"

For LTE interface use LTE interface name in the port field:

/tool sms send lte1 "" \ message="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz!@#\$%^&*(){}[]\"'~"

ParameterDescriptionport

 

(string)Name of port from

 

/port

 

that GSM modem is attached to.-number

 

(string)Recipient number. Allowed characters are "*#abc". If the first character is "+" then the number type is set to

 

international, otherwise, it is set to

 

unknown.channel

 

(integer)Which modem channel to use for sending.message

 

(string)Message contents. It is encoded using GSM 7 encoding (UCS2 currently is not supported), so the message length is limited to 160 characters (characters ^{}\[]~smsc

 

(string)
type

 

(string)If set to

 

class-0, then send class 0 SMS message. It is displayed immediately and not stored in the .sms-storage (string)
Select storage where to save received SMS (modem/sim) status-report-request (yes | no; Default: yes)
Set "no" to not request 

a confirmation message indicating whether a text message was successfully sent to the recipient.

USSD messages

USSD (Unstructured Supplementary Service Data) messages can be used to communicate with mobile network provider to receive additional information, enabling additional services or adding funds to prepaid cards. USSD messages can be processed by using AT commands (commands can differ or even may be blocked on some modems).

3G or GSM network modes must be activated to use this functionality, as it's not supported under LTE only mode (R11e-LTE modem auto switches to 3G mode to send out USSD message).

PDU (Protocol Data Unit) message and its decrypted version are printed under LTE debug logging.

Example

Check if LTE debug logging is active:

/system logging print
Flags: X - disabled, I - invalid, * - default 
# TOPICS ACTION PREFIX 
0 * info memory 
1 * error memory 
2 * warning memory 
3 * critical echo 

If there is no logging entry add it by running this command:

/system logging add topics=lte,!raw

/system logging print
Flags: X - disabled, I - invalid, * - default 
# TOPICS ACTION PREFIX 
0 * info memory 
1 * error memory 
2 * warning memory 
3 * critical echo 
4 lte,!raw memory 

To receive account status from *245#

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/interface lte at-chat lte1 input="AT+CUSD=1,\"*245#\",15"
output: OK
/log print
11:51:20 lte,async lte1: sent AT+CUSD=1,"*245#",15 
11:51:20 lte,async lte1: rcvd OK 
11:51:23 lte,async,event +CUSD: 0,"EBB79B1EE9ECF4BADE9E03", 0 
11:51:23 gsm,info USSD: konta atlikums

Receiving

RouterOS also supports receiving of SMS messages, can execute scripts, and even respond to the sender.

Before the router can receive SMS, the relevant configuration is required in the /tool sms menu. The following parameters are configurable:

ParameterDescriptionallowed-number (string; Default: "")The sender number that will be allowed to run commands, must specify the country code ie. +371XXXXXXXchannel (integer; Default: 0)Which modem channel to use for receiving.keep-max-sms (integer; Default: 0)Maximum number of messages that will be saved. If you set this bigger than SIM supports, new messages will not be received. Replaced with

auto-erase

parameter starting from RouterOS v6.44.6auto-erase (yes | no; Default: no)SIM storage size is read automatically. When

auto-erase=no

new SMS will not be received if storage is full. Set

auto-erase=yes

to delete the oldest received SMS to free space for new ones automatically. Available starting from v6.44.6port (string; Default: (unknown))Modem port (modem can be used only by one process "/port> print" )receive-enabled (yes | no; Default: no)Must be turned on to receive messagessecret (string; Default: "")the secret password, mandatorypolling (yes | no; Default: no)checking the modem for new SMS every 10s, instead of updating the inbox only after receiving the command from the modem. Available starting from v7.16

Basic Example configuration to be able to view received messages:

/tool sms set receive-enabled=yes port=lte1

/tool/sms/print 
           status: running
  receive-enabled: yes
             port: lte1
          channel: 0
           secret: 
   allowed-number: 
       auto-erase: no
          sim-pin: 
        last-ussd: 

Inbox

/tool sms inbox

If you have enabled the reader, you will see incoming messages in this submenu:

Read-only properties:

PropertyDescription

 

(string)Senders number.message

 

(string)Message bodytimestamp

 

(time)The time when the message was received. It is the time sent by the operator, not the router's local time.type

 

(string)Message type

Syntax

 :cmd SECRET script NAME [[ VAR[=VAL] ] ... ]

• SECRET

   

  - the password
• NAME

   

  - the name of the script that's available in "

  /system script

  "
• VAR

   

  - variables that will be passed to the script (can be passed as VAR or as VAR=value), separated by spaces.

Other things to remember:

• *Parameters can be put into quotes "VAR"="VAL" if necessary.
• *Escaping of values is not supported (VAR="\"").
• *Combined SMS are not supported, every SMS will be treated separately
• * 16Bit unicode messages are not supported
• * SMS are decoded with the standard GSM7 alphabet, so you can't send in other encodings, otherwise it will be decoded incorrectly

Examples

Wrong:

:cmd script mans_skripts
:cmd slepens script mans skripts
:cmd slepens script mans_skripts var=
:cmd slepens script mans_skripts var= a
:cmd slepens script mans_skripts var=a a

Right:

:cmd slepens script mans_skripts
:cmd slepens script "mans skripts"
:cmd slepens script mans_skripts var
:cmd slepens script mans_skripts var=a
:cmd slepens script mans_skripts var="a a" 

Debugging

/tool sms send command is logging data that is written and read. It is logged with tags gsm,debug,write and gsm,debug,read For more information see system logging.

Implementation details

AT+CMGS and AT+CMGF commands are used. Port is acquired for the duration of the command and cannot be used concurrently by another RouterOS component. Message sending process can take a long time, it times out after a minute and after two seconds during the initial AT command exchange.

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