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AT Commands for  TCP/UDP Application

 

Command              Description
AT+CACID Set TCP/UDP identifier
AT+CASSLCFG Set SSL certificate and timeout parameters
AT+CAOPEN Open a TCP/UDP connection
AT+CASERVER Open a TCP/UDP Server
AT+CASEND Send data via an established connection
AT+CARECV Receive data via an established connection
AT+CAACK Query Send Data Information
AT+CASTATE Query TCP/UDP Connection State
AT+CACLOSE Close a TCP/UDP connection
AT+CACFG Configure transparent transmission parameters
AT+CASWITCH Switch to transparent transport mode

 

 

 

 

AT+CACID      Set TCP/UDP Identifier

  

T) AT+CACID=?

+CACID: (range of supported <cid>s)

 

OK

Parameters

See Write Command

R) AT+CACID?

[+CACID: <cid>]

 

OK

Parameters

See Write Command

W) AT+CACID=<cid>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     TCP/UDP identifier

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+CASSLCFG      Set SSL Certificate And Timeout Parameters

 

T) AT+CASSLCFG=?

+CASSLCFG: (range of supported <cid>s),”cacert”,<caname>

+CASSLCFG: (range of supported <cid>s),”clientcert”,<certname>

+CASSLCFG: (range of supported <cid>s),”psktable”,<pskname>

+CASSLCFG: (range of supported <cid>s),”timeout”,(0-65535)

+CASSLCFG: (range of supported <cid>s),”ssl”,(0,1)

+CASSLCFG: (range of supported <cid>s),”crindex”,(0,5)

+CASSLCFG: (range of supported <cid>s),”localport”,(0-65536)

+CASSLCFG: (range of supported <cid>s),”protocol”,(0,1)

 

OK

Parameters

See Write Command

R) AT+CASSLCFG?

If <cid> has been set by AT+CACID:

+CASSLCFG: <cid>

cacert:<caname>

clientcert:<certname>

psktable:<pskname>

timeout:<timeout>

ssl:<ssl>

crindex:<crindex>

localport:<localport>

protocol:<protocol>

 

OK

If no <cid> has been set by AT+CACID:

OK

Parameter

See Write Command

W) AT+CASSLCFG=<cid>,

“cacert”,<caname>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     TCP/UDP identifier, see AT+CACID

<caname>    

Alphanumeric ASCII text string up to 64 characters.

Root certificate name that has been configured by AT+CSSLCFG.

Note: If the root certificate is empty, module will trust all certificates as default.

AT+CASSLCFG=<cid>,

“clientcert”,<certname> 

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<certname>    

Alphanumeric ASCII text string up to 64 characters.

Client certificate name that has been configured by AT+CSSLCFG.

AT+CASSLCFG=<cid>,“psktable”,<pskname>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<pskname>    

Alphanumeric ASCII text string up to 64 characters.

PSK table name that has been configured by AT+CSSLCFG.

File content format is <identity>:<hex string>.

AT+CASSLCFG=<cid>,“ssl”,<sslFlag>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<sslFlag>     Interger

0     Not support SSL

1     Support SSL

AT+CASSLCFG=<cid>,“crindex”,<crindex>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<ctxindex>     The identifier of SSL configurations, see AT+CSSLCFG.

AT+CASSLCFG=<cid>,“protocol”,<crindex>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<protocol>     Interger

0     TCP

1     UDP

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+CAOPEN      Open A TCP/UDP Connection

 

T) AT+CAOPEN=?

+CAOPEN: (range of supported <cid>s),<server>,(1-65535)

 

OK

Parameters

See Write Command

R) AT+CAOPEN?

If <cid> has been set by AT+CACID:

+CAOPEN: <cid>,<conn_type>,<server>,<port>

 

OK

If no <cid> has been set by AT+CACID:

OK

Parameter

See Write Command

W) AT+CAOPEN=<cid>[,

<conn_type>],<server>,

<port>

If <asyncOpen_enable> not set or set 0.

+CAOPEN: <cid>,<result>

 

OK

Otherwise

OK

 

+CAOPEN: <cid>,<result>

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<conn_type>

String type.

Transfer type.

IPV4 or IPV6 address can be automatically identified on the client.

“TCP”

“UDP”

<server>    

Alphanumeric ASCII text string up to 64 characters.

Server IP address or host name.

<port>   

Interger.

Server port.

<result>

0     Success

1     Socket error

2     No memory

3     Connection limit

4     Parameter invalid

6     Invalid IP address

7     Not support the function

12     Can’t bind the port

13     Can’t listen the port

20     Can’t resolv the host

21     Network not active

23     Remote refuse

24     Certificate’s time expired

25     Certificate’s common name does not match

26     Certificate’s common name does not match and time expired

27     Connect failed

Parameter Saving Mode NO_SAVE
Reference

Note

After open a connection successfully, if module receives data,

it will report “+CADATAIND: <cid>” to remind user to read data.

 

 

 

 

AT+CASERVER      Open A TCP/UDP Server

   

T) AT+CASERVER=?

+CASERVER: (range of supported <cid>s),(list of supported <conn_type>s),(range of supported <port>s)

 

OK

R) AT+CASERVER?

[+CASERVER: <cid>,<conn_type>,<port>]

OK

W) AT+CASERVER<cid>,<conn_type>,<port>

+CASERVER: <cid>,<result>

 

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameter Saving Mode NO_SAVE

 

 

<cid> TCP/UDP identifier
<conn_type>

Transfer type

“TCP”

“TCP6”

“UDP”

“UDP6”

<port>

Integer.

Server port.

<result>

0     Success

1     Socket error

2     No memory

3     Connection limit

4     Parameter invalid

6     Invalid IP address

7     Not support the function

12     Can’t bind the port

13     Can’t listen the port

20     Can’t resolv the host

21     Network not active

23     Remote refuse

24     Certificate’s time expired

25     Certificate’s common name does not match

26     Certificate’s common name does not match and time expired

27     Connect failed error

 

 

NOTE

After a client access, it will report that.

+CANEW: <server_cid>,<client_cid>,<client_ip>,<client_port>

 

 

 

 

AT+CASEND      Send Data Via An Established Connection

  

T) AT+CASEND=?

+CASEND: (range of supported <cid>s),(range of supported <datalen>),(range of supported <inputtime>)

 

OK

Parameters

See Write Command

W) AT+CASEND=<cid>

+CASEND: <leftsize>

 

OK

If error is related to ME functionality:

+CME ERROR: <err>

 

W) AT+CASEND=<cid>,<datalen>[,inputtime]

+CASEND: <cid>,<datalen>

…….. //Input data

OK

+CASEND: <cid>,<result>,<sendlen>

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<datalen>     Requested number of data bytes to be transmitted

<inputtime>     Millisecond, should input data during this period or you can’t input data when timeout.

<sendlen>     Data bytes that has been sent successfully

<result>     see AT+CAOPEN

Parameter Saving Mode NO_SAVE
Reference

Note

Set the input time that input data during this period or you can’t input data when timeout.

The default inputtime is 5000ms.

 

 

 

 

AT+CARECV      Receive Data Via An Established Connection

 

T) AT+CARECV=?

+CARECV: (range of supported <cid>s),(range of supported <readlen>)

 

OK

Parameters

See Write Command

W) AT+CARECV=<cid>,<readlen>

+CARECV: <cid>,<recvlen>

……. //output data

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

<readlen>     Requested number of data bytes to be read

<recvlen>     Data bytes that has been actually received

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+CAACK      Query Send Data Information

 

T) AT+CAACK=?

+CAACK: (range of supported <cid>s)

 

OK

W) AT+CAACK=<cid>

+CAACK: <totalsize>,<unacksize>

 

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameter Saving Mode NO_SAVE

 

  

<cid> TCP/UDP identifier
<totalsize> Total size of sent data.
<unacksize> The size of unack data

 

 

 

 

AT+CASTATE      Query TCP/UDP Connection State

  

R) AT+CASTATE?

[+CASTATE: <cid>,<state>]

OK

Unsolicited Result Code

If the remote connection is disconnected。

+CASTATE: <cid>,<state>

Parameter Saving Mode NO_SAVE

 

 

<cid> TCP/UDP identifier
<state>

0     Closed by remote server or internal error

1     Connected to remote server

2     Listening (server mode)

 

 

 

 

AT+CACLOSE      Close A TCP/UDP Connection

 

T) AT+CACLOSE=?

+CACLOSE: (range of supported <cid>s)

 

OK

Parameters

See Write Command

W) AT+CACLOSE=<cid>

OK

If error is related to ME functionality:

+CME ERROR: <err>

Parameters

<cid>     see AT+CACID

Unsolicited Result Code

If <autoClose_s>=1, this report will be reported when the remote connection is disconnected.

+CACLOSE: (range of supported <cid>s)

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+CACFG      Configure Transparent Transmission Parameters

 

T) AT+CACFG=?

+CACFG: “TRANSWAITTM”,(range of supported <wait_timeout>s)

+CACFG: “TRANSPKTSIZE”,(range of supported <size>s)

+CACFG: “SACK”,(list of supported <sack_enable>s)

+CACFG: “MSS”,(range of supported <mss_value>s)

+CACFG: “ACKDELAY”,(range of supported <ackDelay_ms>s)

+CACFG: “TCPIRT”,(range of supported <tcpIRT_ms>s)

+CACFG: “MAXRXT”,(range of supported <tcpMaxRXT_cnt>s)

+CACFG: “TCPOT”,(range of supported <tcpOT_ms>s)

+CACFG: “KEEPALIVE”,(list of supported<keepalive_enable>s)[,(range of supported

<keepalive_idle>s), (range of supported <keepalive_intval>s),

(range of supported <keepalive_cnt>s)]

+CACFG: “TCP_NODELAY”,(list of supported <tcpNodelay_enable>s)

+CACFG: “LINGER”,(list of supported <linger_enable>s)[,(range of supported <linger_ms>s)]

+CACFG: “SNDBUF”,(range of supported <sndBuf_size>)

+CACFG: “RCVBUF”,(range of supported <rcvBuf_size>)

+CACFG: “ATOCLOSE”,(list of supported <autoClose_enable>s)

[,(range of supported <autoClose_s>s]

+CACFG: “ACCEPTNUM”,(range of supported <acceptMax_num>s)

+CACFG: “ASYNCOPEN”,(list of supported <asyncOpen_enable>s)

+CACFG: “TIMEOUT”,(range of supported <cid>s),(range of supported <timeout>s)

+CACFG: “LOCALPORT”,(range of supported <cid>s),(range of supported <localport>s)

+CACFG: “REMOTEADDR”,(range of supported <cid>s),

(range of supported <ip address>s),(range of supported <port>s)

 

OK

R) AT+CACFG?

+CACFG:

+TRANSWAITTM: <wait_timeout>

+TRANSPKTSIZE: <size>

[

+CACFG: “SACK”,<sack_enable>

+CACFG: “MSS”,<mss_value>

+CACFG: “ACKDELAY”,<ackDelay_ms>

+CACFG: “TCPIRT”,<tcpIRT_ms>

+CACFG: “MAXRXT”,<tcpMaxRXT_cnt>s)

+CACFG: “TCPOT”,<tcpOT_ms>

+CACFG:

“KEEPALIVE”,<keepalive_enable>[<keepalive_idle>,<keepalive_intval>,

<keepalive_cnt>]

+CACFG: “TCP_NODELAY”,<tcpNodelay_enable>

+CACFG: “LINGER”,<linger_enable>[,<linger_ms>]

+CACFG: “SNDBUF”,<sndBuf_size>

+CACFG: “RCVBUF”,<rcvBuf_size>

+CACFG: “ATOCLOSE”,<autoClose_enable>[,<autoClose_s>]

+CACFG: “ACCEPTNUM”,<acceptMax_num>

+CACFG: “ASYNCOPEN”,<asyncOpen_enable>

+TIMEOUT: <cidx>,<timeoutx>…

+LOCALPORT: <cidx>,<localportx>…

[+REMOTEADDR,<cidx>,<ipadressx>,<portx>…

]]

 

OK

W) AT+CACFG=”TRANSWAITTM”,<wait_timeout> 

OK

or

ERROR

W) AT+CACFG=”TRANSPKTSIZE”,<size>

OK

or

ERROR

W) AT+CACFG=”SACK”,<sack_enable>

OK

or

ERROR

W) AT+CACFG=”MSS”,<mss_value>

OK

or

ERROR

W) AT+CACFG=”ACKDELAY”,<ackDelay_ms>

OK

or

ERROR

W) AT+CACFG=”TCPIRT”,<tcpIRT_ms>

OK

or

ERROR

W) AT+CACFG=”TCPOT”,<tcpOT_ms>

OK

or

ERROR

W) AT+CACFG=”KEEPALIVE”,keepalive_enable>[<keepalive_idle>,<keepalive_intval>,<keepalive_cnt>]

OK

or

ERROR

W) AT+CACFG=”TCP_NODELAY”,<tcpNodelay_enable>

OK

or

ERROR

W) AT+CACFG=”LINGER”,<linger_enable>[,<linger_ms>]

OK

or

ERROR

W) AT+CACFG=”SNDBUF“,<sndBuf_size>

OK

or

ERROR

W) AT+CACFG=”RCVBUF“,<rcvBuf_size>

OK

or

ERROR

W) AT+CACFG=”ATOCLOSE”,<autoClose_enable>[,<autoClose_s>]

OK

or

ERROR

W) AT+CACFG=”ACCEPTNUM”,<acceptMax_num>

OK

or

ERROR

W) AT+CACFG=”ASYNCOPEN”,(0-1)

OK

or

ERROR

W) AT+CACFG=”TIMEOUT“,<cid>,<timeoutx>

OK

or

ERROR

W) AT+CACFG=”LOCALPORT”,<cid>,<localport> 

OK

or

ERROR

W) AT+CACFG=”REMOTEADDR”,<cid>,<ipaddress>,<localport>

OK

or

ERROR

Parameter Saving Mode NO_SAVE

 

 

 

 

AT+CASWITCH      Switch To Transparent Transport Mode

  

T) AT+CASWITCH=?

+CASWITCH: (0-1),(0,1)

 

OK

R) AT+CASWITCH?

+CASWITCH: 0,0

 

OK

W) AT+CASWITCH=<cid>,<transmode>

OK

or

OK

 

CONNECT

… …

 

OK

or

ERROR

Parameters

<cid>     see AT+CACID

<transmode>

0     Non transparent transmission mode

1     Transparent transmission mode

Parameter Saving Mode NO_SAVE

 

 

 

 

 

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