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Reference section - SMPP

enquire_link

SMPP enquire_link

SMPP v5

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 NameSize OctetsTypeDescriptionRef.
command_length4IntegerDefines the overall length of the PDU.4.7.4
command_id4Integer0x000000154.7.5
command_status4Integer0x000000004.7.6
sequence_number4IntegerSet 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 NameSize OctetsTypeDescriptionRef.
command_length4IntegerDefines the overall length of the PDU.4.7.4
command_id4Integer0x800000154.7.5
command_status4Integer0x000000004.7.6
sequence_number4IntegerSet to the same sequence number of original enquire_link PDU.4.7.24

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