SMS gateway
SMS Gateway communication protocol
Description
Communication line configuration
Communication station configuration
I/O tag configuration
Document revisions
Description
SMS Gateway protocol supports:
sending SMS
receiving SMS
dialing calls
receiving calls
The implementation is based on the sending and processing of AT commands that are changed through asynchronous serial line.
Communication line configuration
Communication line category: Modem
Communication line parameters:
Parameter | Default value | Meaning |
|---|---|---|
Device |
| Name of communication port. |
Init command | AT&F | AT command that reinitializes a device. |
Dial command | ATD | AT command used when dialing of a telephone number. |
Hangup | +++~~~~ATH | AT command to hang up the connection. |
DTR | Checked | DTR signal is used to hang up connection instead of AT command. |
Communication station configuration
Parameter | Default value | Meaning |
|---|---|---|
Trace Data | YES | Both received and sent data are written to log file. |
PIN Code | 0000 | PIN code of SIM card (GSM modem). |
Use Semicolon | YES | Semicolon is inserted at the end of ATD command. |
Hang Up Incoming Call | YES | Enable to hang up the incoming call in a defined time. |
Hang Up Time | 35 sec | Defines a duration of incoming call. |
Delay Between Rings | 3 sec | Some of the modems do not inform about change of status: "ringing -> received", "ringing -> hung up". In "ringing" status, the flags that indicates ringing are sent. If during the set interval the ringing is not indicated, status automat of protocol will change its status to "hang up". Zero disables to use this indication. |
Outgoing Call Duration | 3 sec | The time after which the outgoing call is terminated. |
Modem Is Ready Interval | 600 sec | After elapsing of this time, the modem is reinitiated. |
Acknowledgment of Receipt | YES | It switches receipts when sending SMS messages. |
Service Center Address | +421905303303 | Phone number of service center for SMS messages. |
Read From Modem SMS | 60 sec | Interval of checking the received messages and receipts in modem. |
Expect OK After Dial | YES | Indicates whether a device sends the answer "OK" after dialing the phone number. |
I/O tag configuration
I/O tags: Ci, Co, Di , Do, TxtI, TxtO
Value type | Address | Meaning |
|---|---|---|
Outgoing calls | ||
TxtO | OUTGOINGTELNUM | it sets the phone number of outgoing call. |
TxtI | OUTGOINGRESULTNUMBER | The protocol can send multiple requests to dial a phone number at the same time. These requests are saved to the list and they are dialed gradually. In the I/O tad, the value of the last dialed number is saved. Together with I/O tag with OUTGOINGRESULTFLAG address it informs about a result of call. |
Co | OUTGOINGRINGTIME | It sets duration of outgoing call including the dialing. It can be used as trigger to start dialing. If the phone number (the value of I/O tag with BUSY address is TRUE) cannot be dialed at that time, the values of I/O tags keep in a queue and postponed for later processing. |
Di | OUTGOINGRESULTFLAG | It informs about the result of call. If outgoing call has been received, the value is TRUE, otherwise FALSE. |
Incoming calls | ||
TxtI | INCOMMINGTELNUM | Contains the phone number of incoming call. |
Di | INCOMMINGRINGING | It indicates that the incoming call is active. At a given moment the value INCOMMINGTELNUM is not valid yet. |
Outgoing SMS messages | ||
TxtO | OUTGOINGSMSNUMBER | Sets the phone number to which SMS message will be sent. |
TxtO | OUTGOINGSMSID | It keeps the value of own unique identifier of message. This value helps to find out whether the message could have been sent. It also couples the message receipts with the sent message. |
TxtO | OUTGOINGSMSBODY | Sets the text of SMS message. It is a trigger of sending the message, which means that its value must be set as the last. After starting the trigger, the values of necessary I/O tags are saved into the queue. SMS message is ready to send. |
Di | OUTGOINGSMSRESULT | Together with the identifier, which is set in I/O tag with address OUTGOINGSMSRESULTID it informs about the status of sending the SMS message. |
TxtI | OUTGOINGSMSRESULTID | If there are multiple SMS messages in the queue, there is necessary, together with the identifier, which is set in I/O tag with address, to inform about the status of each SMS message. |
Incoming SMS messages | ||
Txti | INCOMMINGSMSNUMBER | It contains the phone number of received SMS message. |
Txti | INCOMMINGSMSBODY | It contains the text of received SMS message. |
Ci | INCOMMINGSMSTRIGGERIN | If the new SMS message has been received, the value is incremented by 1. It may be used as the trigger of receiving the new SMS message. |
Co | INCOMMINGSMSTRIGGEROUT | It confirms the reading of SMS message. The value from the I/O tag with address INCOMMINGSMSTRIGGERIN is set up in this I/O tag. |
SMS receipts | ||
TxtI | INCOMMINGRECEIPTID | It keeps the unique identifier of SMS message, which was chosen during its sending. |
Ci | INCOMMINGRECEIPTTRIGGERIN | If the new SMS receipt has been received, the value is incremented by 1. The value of identifier INCOMMINGRECEIPTID is valid at the particular moment. |
Co | INCOMMINGRECEIPTTRIGGEROUT | It confirms the reading of SMS receipt. The value from the I/O tag with address INCOMMINGRECEIPTTRIGGERIN is set up in this I/O tag. |
Common | ||
Di | BUSY | It informs about modem status. |