cSMPP
Melrose Labs cSMPP for narrowband applications
cSMPP is an optional alternative communication protocol that can be used with Message Hub.
cSMPP PDU format
PDU component | Description | Length |
---|---|---|
Length | Overall length of PDU including the length component | 2 bytes |
Command bit sequence | SMPP command as bit sequence (see Command bit sequence) | Variable (bits) |
Field bitmap | Bitmap indicating presence of SMPP PDU fields in fields segment | Variable (bits) |
Fields | SMPP fields indicated in field bitmap. All other fields are assumed to be set to default values and not included in PDU. | Variable (bytes) |
Command bit sequence and field bitmap are a continuous sequence of bits that is padded to bytes (e.g. 5 bits command bit sequence + 25 bits field bitmap = 30 bits which is then padded to 32 bits = 4 bytes).
Command bit sequence
SMPP command | Bit sequence |
---|---|
bind_transceiver | 000000 |
bind_transceiver_resp | 000001 |
bind_transmitter | 000010 |
bind_transmitter_resp | 000011 |
bind_receiver | 000100 |
bind_receiver_resp | 000101 |
submit_sm | 100 |
submit_sm_resp | 101 |
deliver_sm | 110 |
deliver_sm_resp | 111 |
data_sm | 00110 |
data_sm_resp | 00111 |
alert_notification | 000110 |
enquire_link | 0110 |
enquire_link_resp | 0111 |
query_sm | 010010 |
query_sm_resp | 010011 |
cancel_sm | 010100 |
cancel_sm_resp | 010101 |
replace_sm | 010110 |
replace_sm_resp | 010111 |
unbind | 0001110 |
unbind_resp | 0001111 |
generic_nack | 010000 |
cSMPP supports all SMPP v3.4 and v5 standard commands except outbound/_resp, submit_multi/_resp, broadcast_sm/_resp, query_broadcast/_resp and cancel_broadcast_sm/_resp.
Fields
Representation of fields in cSMPP PDUs is more closely aligned to type of field in favour of PDU size.
Field | |
---|---|
validity_period | Absolute value only supported. Stored as 32-bit unsigned integer representing seconds since epoch.. |
schedule_delivery_time | Absolute value only supported. Stored as 32-bit unsigned integer representing seconds since epoch. |
Updated over 1 year ago