Reference section - SMPP
enquire_link
SMPP enquire_link
SMPP (Short Message Peer-to-Peer) is an open, industry standard protocol designed to provide a flexible data communications interface for the transfer of short message data between External Short Message Entities (ESME), Routing Entities (RE) and Message Centres (MC). The SMPP protocol is a means by which applications can send SMS messages to mobile devices and receive SMS from mobile devices.
4.1.2 Enquire Link Operation
This PDU can be originated by either the ESME or MC and is used to provide a confidence check of the communication path between an ESME and a MC. On receipt of this request the receiving party should respond with an enquire_link_resp, thus verifying that the application level connection between the MC and the ESME is functioning. The ESME may also respond by sending any valid SMPP primitive.
The enquire_link can be sent when the session is in the open, bound (TX, RX or TRX), unbound or outbound states. Typical values for the period of inactivity before the ESME or MC originate this operation are between 30s and 120s.
4.1.2.1 enquire_link Syntax
| Field Name | Size Octets | Type | Description | Ref. |
| command_length | 4 | Integer | Defines the overall length of the PDU. | 4.7.4 |
| command_id | 4 | Integer | 0x00000015 | 4.7.5 |
| command_status | 4 | Integer | 0x00000000 | 4.7.6 |
| sequence_number | 4 | Integer | Set to a unique sequence number. The associated enquire_link_resp PDU should echo the same sequence number. | 4.7.24 |
4.1.2.2 enquire_link_resp Syntax
The enquire_link_resp PDU is used to reply to an enquire_link request.
| Field Name | Size Octets | Type | Description | Ref. |
|---|---|---|---|---|
| command_length | 4 | Integer | Defines the overall length of the PDU. | 4.7.4 |
| command_id | 4 | Integer | 0x80000015 | 4.7.5 |
| command_status | 4 | Integer | 0x00000000 | 4.7.6 |
| sequence_number | 4 | Integer | Set to the same sequence number of original enquire_link PDU. | 4.7.24 |
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