AT#SI
#SI: 1,123,400,10,50
#SI: 2,0,100,0,0
#SI: 3,589,100,10,100
#SI: 4,0,0,0,0
#SI: 5,0,0,0,0
#SI: 6,0,98,60,0
...
OK
Sockets 1,2,3,6 are opened with some data traffic.
For example, socket 1 has 123 bytes sent, 400 bytes received, 10
bytes waiting to be read and 50 bytes waiting to be acknowledged
from the remote side.
AT#SI=1
#SI: 1,123,400,10,50
OK
We have information only about socket number 1