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1. Information Elements related to TCP/IP 

 

Information       Description
+CIPEVENT: NETWORK CLOSED UNEXPECTEDLY

Network is closed for network error (Out of service, etc).

When this event happens, user’s application needs to check and close all opened sockets,

and then uses AT+NETCLOSE to release the network library

if “AT+NETOPEN?” shows  the network library is still opened.

+IPCLOSE: <client_index>, <close_reason>

Socket is closed passively. <client_index> is the link number.

<close_reason>:

0      Closed by local, active

1      Closed by remote, passive

2      Closed for sending timeout

+CLIENT: < link_num>,<server_index>,<client_IP>:<port>

While TCP server accepted a new socket client, the index is <link_num>.

The TCP server index is <server_index>.

The peer IP address is <client_IP>.   The peer port  is <port>.

 

 

 

 

2. Description of <err_info> 

The fourth parameter <errMode> of AT+CIPCCFG is used to determine how <err_info> is displayed.

If <errMode> is set to 0, the <err_info> is displayed with numeric value.

If <errMode>is set to 1, the <err_info> is displayed with string value.

The default is displayed with string value.

 

Numeric Value String Value
21 Operation failed
0 Connection time out
1 Bind port failed
2 Port overflow
3 Create socket failed
4 Network is already opened
5 Network is already closed
6 No clients connected
7 No active client
8 Network not opened
9 Client index overflow
10 Connection is already created
11 Connection is not created
12 Invalid parameter
13 Operation not supported
14 DNS query failed
15 TCP busy
16 Netclose failed for socket opened
17 Sending time out
18 Sending failure for network error
19 Open failure for network error
20 Server is already listening
21 No Data
22 Port Overflow

 

 

 

 

 

3. Description of <err> 

 

<err> Description of <error>
0 Operation succeeded
1 Network failure
2 Network not opened
3 Wrong parameter
4 Operation not supported
5 Failed to create socket
6 Failed to bind socket
7 TCP server is already listening
8 Busy
9 Sockets opened
10 Timeout
11 DNS parse failed for AT+CIPOPEN
12 Unknown error

 

 

 

 

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