User guide

Redpine Signals, Inc. Proprietary and Confidential. Page 53
R
R
S
S
9
9
1
1
1
1
0
0
-
-
N
N
-
-
1
1
1
1
-
-
2
2
2
2
/
/
2
2
4
4
/
/
2
2
8
8
S
S
o
o
f
f
t
t
w
w
a
a
r
r
e
e
P
P
r
r
o
o
g
g
r
r
a
a
m
m
m
m
i
i
n
n
g
g
R
R
e
e
f
f
e
e
r
r
e
e
n
n
c
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M
M
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u
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4
4
.
.
1
1
5
5
Figure 4: Send Operation
at+rsi_snd
Module sends
data to remote
terminal
Got TCP ACK
from remote
terminal ?
Yes
Retry count
=14?
Try sending
again
No
No
AT+RSI_CLOSE\r\n is
sent to the host.
Continue
normal
operations
Operations happening
inside the module
Some common reasons for not getting a TCP ACK from the remote terminal:
- Abnormal destruction of the remote network, plugging out network cables
etc.
Send OK<sz> or ERROR -2, -
8, -9, -113, -20 to Host.
ERROR -2 is sent if module
already knows remote socket
is not present.
OK or Error sent?
Yes
No