W3150 Datasheet, PDF (28/59 Pages) List of Unclassifed Manufacturers – WIZnet’s Online Technical Support

Sn_SR (Socket n Status Register) [R] [0x0403, 0x0503, 0x0603, 0x0703] [0x00]
This register has the status vaule of socket. The main status is shown in the below diagram.
Value
0x00
0x13
0x14
0x17
0x1C
Symbol
SOCK_CLOSED
SOCK_INIT
SOCK_LISTEN
SOCK_ESTABLISHED
SOCK_CLOSE_WAIT
Description
In case that OPEN commands are given to Sn_CR, Timeout interrupt is
asserted or connection is terminated.
In case that Sn_MR is set as TCP and OPEN commands are given to
Sn_CR.
In case that under the SOCK_INIT status, LISTEN commands are given
to Sn_CR.
In case that connection is established.
In case that connection termination request is received.
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