Quectel WCDMA UG FTP Series Installation manual

WCDMA UGxx FTP
AT Commands Manual
UMTS/HSPA Module Series
Rev. WCDMA_UGxx_FTP_AT_Commands_Manual_V1.3
Date: 2016-05-05
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About the Document
History
Revision
Date
Author
Description
1.0
2014-12-13
Jonathan WEN
Initial
1.1
2015-03-06
Jessica GENG
Changed the document name from “UG95”
to “UGxx”.
1.2
2015-04-01
Jessica GENG
Updated applicable modules.
1.3
2016-05-05
Sophie ZHU
Added Error Code 631
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Contents
About the Document...................................................................................................................................2
Contents.......................................................................................................................................................3
Table Index...................................................................................................................................................5
1Introduction..........................................................................................................................................6
1.1. The Process of FTP Operation................................................................................................6
1.2. Description of FTPS................................................................................................................7
1.3. Description of Data Mode........................................................................................................8
1.4. Error Handling .........................................................................................................................8
1.4.1. Executing FTPAT Command Fails....................................................................................8
1.4.2. PDPActivation Fails...........................................................................................................8
1.4.3. DNS Parse Fails ................................................................................................................9
1.4.4. Error Response of FTP Server..........................................................................................9
2Description of AT Command............................................................................................................10
2.1. AT+QFTPCFG FTP Configurations....................................................................................10
2.2. AT+QFTPOPEN Login to FTP Server................................................................................13
2.3. AT+QFTPCWD Set the Current Directory on FTP Server.................................................14
2.4. AT+QFTPPWD Get the Current Directory on FTP Server.................................................14
2.5. AT+QFTPPUT Upload a File to FTP Server.......................................................................15
2.6. AT+QFTPGET Download a File from FTP Server..............................................................18
2.7. AT+QFTPSIZE Get the File Size on FTP Server ...............................................................20
2.8. AT+QFTPDEL Delete the File on FTP Server....................................................................21
2.9. AT+QFTPMKDIR Make a Folder on FTP Server...............................................................22
2.10. AT+QFTPRMDIR Delete an Empty Folder on FTP Server................................................23
2.11. AT+QFTPLIST List Contents of Directory on FTP Server..................................................23
2.12. AT+QFTPNLST List File Names of Directory on FTP Server ............................................25
2.13. AT+QFTPRENAME Rename a File or Folder on FTP Server ...........................................27
2.14. AT+QFTPLEN Get the Transferred Data Length ...............................................................28
2.15. AT+QFTPSTAT Get the Status of FTP Service..................................................................28
2.16. AT+QFTPCLOSE Logout from FTP Server........................................................................29
2.17. AT+QFTPMLSD List Standardized File and Directory Information....................................30
2.18. AT+QFTPMDTM Get the File Modification Time on FTP Server.......................................31
3Example ..............................................................................................................................................33
3.1. Login to FTP Server..............................................................................................................33
3.2. Folder Operation....................................................................................................................34
3.3. File Operation........................................................................................................................34
3.4. List File Information or File Names .......................................................................................35
3.5. Upload a File to FTP Server..................................................................................................36
3.6. Download a File from FTP Server.........................................................................................38
3.7. Logout from FTP Server........................................................................................................39
3.8. FTPS Configuration...............................................................................................................39
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4Summary of Error Codes ..................................................................................................................41
5Summary of FTP Protocol Error Codes...........................................................................................43
6Appendix A Reference.......................................................................................................................44
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Table Index
TABLE 1: SUMMARY OF ERROR CODES............................................................................................... 41
TABLE 2: SUMMARY OF FTP PROTOCOL ERROR CODES..................................................................43
TABLE 3: RELATED DOCUMENTS ..........................................................................................................44
TABLE 4: TERMS AND ABBREVIATIONS ................................................................................................44
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1Introduction
This document is applicable to Quectel UGxx modules.
1.1. The Process of FTP Operation
As the module provides FTP protocol, you can operate file and directory on FTP server by these FTP AT
commands. The general process is as follows:
Step 1: Configure and activate the PDP context.
1) Configure the PDP context parameters <apn>, <username>, <password> and other parameters
by AT+QICSGP (Please refer to Quectel_WCDMA_UGxx_TCPIP_AT_Commands_Manual). If
QoS settings need to be updated, configure them by the commands AT+CGQMIN,
AT+CGEQMIN, AT+CGQREQ and AT+CGEQREQ (For more details, please refer to
Quectel_WCDMA_UGxx_AT_Commands_Manual).
2) Activate the PDP context by AT+QIACT.
3) Configure the PDP context ID for FTP by AT+QFTPCFG=“contextid”,<contextID>. You should
activate the PDP context first.
Step 2: Configure FTP service settings.
1) Configure account information by AT+QFTPCFG=“account”,<username>,<password>.
2) Configure file type by AT+QFTPCFG=“filetype”,<file_type>. The file type means the transferred
data between FTP server and client is binary data or ASCII data.
3) Configure the transfer mode by AT+QFTPCFG=“transmode”,<transmode>. The transfer mode
means either the FTP server or client listens to the data connection.
4) Configure the response timeout value by AT+QFTPCFG=“rsptimeout”,<timeout>.
Step 3: Login to FTP server.
Login to FTP server by AT+QFTPOPEN=<hostname>,<port>. And the URC “+QFTPOPEN: 0,0”
indicates that login is successful.
Step 4: File operation.
1) Set the current directory byAT+QFTPCWD.
2) Upload a file to FTP server.
a) You can upload a local file to FTP server by AT+QFTPPUT. The file can be RAM files .You can
upload a file to RAM by AT+QFUPL (For more details, please refer to
Quectel_WCDMA_UGxx_FILE_AT_Commands_Manual). After uploading the file to FTP server
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successfully, you can delete the file by AT+QFDEL (For more details, please refer to
Quectel_WCDMA_UGxx_FILE_AT_Commands_Manual).
b) You can upload a file to FTP server from COM port by AT+QFTPPUT too. Then the module will
enter into data mode. You can input “+++” to complete the file uploading.
3) Download a file from FTP server.
You can download a file from FTP server by AT+QFTPGET. The file can be output to COM port
or saved to RAM. If you output the file to COM port, the module will enter into data mode.
4) Get the size of file on FTP server byAT+QFTPSIZE.
5) Get the length of data transferred between FTP server and client byAT+QFTPLEN.
6) Delete a file on FTP server byAT+QFTPDEL.
7) Rename a file on FTP server by AT+QFTPRENAME.
Step 5: Directory operation on FTP server.
1) Set the current directory by AT+QFTPCWD.
2) Create a directory by AT+QFTPMKDIR.
3) List the content of a directory by AT+QFTPLIST.
4) List file names of a directory by AT+QFTPNLST.
5) Rename a directory by AT+QFTPRENMAE.
6) Delete a directory by AT+QFTPRMDIR.
Step 6: Close connection with FTP server.
Close the connection with FTP server by AT+QFTPCLOSE, and the URC “+QFTPCLOSE: 0,0”
will be reported, it indicates the operation is successful. Step 3 to Step 6 can be repeated.
Step 7: Deactivate PDP context.
Deactivate the PDP context by AT+QIDEACT=<contextID> (For more details, please refer to
Quectel_WCDMA_UGxx_TCPIP_AT_Commands_Manual).
1.2. Description of FTPS
The module support FTPS client. FTPS means all data from control connection or data connection is
SSL/TLS encrypted. The only difference between FTPS and FTP is the AT+QFTPCFG and
AT+QFTPOPEN command.
If module plays as FTPS client, you should do as follows:
1. RunAT+QFTPCFG=“ssltype”,1
2. RunAT+QFTPCFG=“sslctxid”,<sslctxID> to select a <sslctxID>
3. Run AT+QSSLCFG to configure the selected <sslctxID>. For more details, please refer to
Quectel_WCDMA_UGxx_SSL_AT_Commands_Manual.
4. Log in to FTPS server. The FTPS server has a different port with FTP server, usually the port is 990.
Please make it sure by the FTPS server provider.
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5. If module logs in FTPS server successfully, all other operations are the same as FTP client.
1.3. Description of Data Mode
The mode of the COM port includes AT command mode and data mode. The difference between them is
that in AT command mode, the inputted data via COM port will be treated as AT command, while in data
mode, it will be treated as data.
You can exit from data mode by “+++” or pulling up DTR (AT&D1 should be set). To prevent the “+++” from
being misinterpreted as data, it should comply with the following sequence:
1) Do not input any character in 1 second or longer before inputting “+++”.
2) Input “+++” in 1 second, and no other characters can be input during this time.
3) Do not input any character in 1 second after “+++” has been inputted.
When you execute AT+QFTPPUT, AT+QFTPGET, AT+QFTPLIST and AT+QFTPNLST, if the local file
path is “COM:”, which means data will be received from or output to COM port, the module will enter into
data mode. You can exit from data mode by inputting “+++” or changing DTR level from low to high. Else,
you can reenter data mode by executing ATO command when executing AT+QFTPGET, AT+QFTPLIST
and AT+QFTPNLST. You can’t reenter data mode by ATO when executing AT+QFTPPUT.
1.4. Error Handling
1.4.1. Executing FTP AT Command Fails
If you execute FTP AT command and receive response “ERROR” from the module, please check whether
the SIM card is inserted and whether the result of AT+CPIN? is “+CPIN: Ready”.
1.4.2. PDP Activation Fails
If you failed to activate PDP context byAT+QIACT command, please check the following aspects:
1. Query whether the PS domain is attached byAT+CGATT? command, if not, executeAT+CGATT=1 to
attach PS domain.
2. Query the CGREG status by AT+CGREG? command and make sure the PS domain has already
been registered.
3. Query the PDP context parameters by AT+QICSGP command, make sure the APN of specified PDP
context has been set.
4. Make sure the specified PDP context ID is neither used by PPP nor activated by AT+CGACT
command.
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5. The module only supports three PDP contexts activated simultaneously, so you must make sure the
number of activated PDP contexts is less than 3.
If the result of checking is OK, but the result of executingAT+QIACT command still fails, please reboot the
module to resolve this issue. After rebooting the module, please follow the above checking at least three
times and each time at an interval of 10 minutes to avoid frequently rebooting of the module.
1.4.3. DNS Parse Fails
When executing AT+QFTPOPEN command, if “+QFTPOPEN: 604,0” is returned, please check the
following aspects:
1. Make sure the domain name of FTP server is valid.
2. Query the status of PDP context by executing “AT+QIACT?” command to make sure the specified
PDP context has been activated successfully.
1.4.4. Error Response of FTP Server
If the <protocol_error> in “+QFTPXX: <err>,<protocol_error>”is not 0, it is replied from FTP server. You
can check the issues depending on the protocol error code. For example, if <protocol_error> is 533 (Not
login, refer to Chapter 5), <username> or <password> may be wrong. If <protocol_error> is 550 (Request
failed, refer to Chapter 5), the file or directory may not exist. For details, you can refer to the document
RFC959 (File Transfer Protocol).
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2Description of AT Command
2.1. AT+QFTPCFG FTP Configurations
Configure FTP server, user account, file type, transfer mode and context ID. If the Write Command just
takes one parameter, it will query the specified information
AT+QFTPCFG FTP Configurations
Test Command
AT+QFTPCFG=?
Response
+QFTPCFG: “account”,<username>,<password>
+QFTPCFG: “filetype”,(0,1)
+QFTPCFG: “transmode”,(0,1)
+QFTPCFG: “contextid”,(1-20)
+QFTPCFG: “rsptimeout”,(20-180)
+QFTPCFG: “ssltype”,(0,1)
+QFTPCFG: “sslctxid”,(0-5)
OK
Write Command
AT+QFTPCFG=“account”[,<usernam
e>,<password>]
Response
If <username> and <password> are not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “account”,<username>,<password>
OK
Write Command
AT+QFTPCFG=“filetype”[,<file_type>
]
Response
If <file type> is not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “filetype”,<file_type>
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OK
Write Command
AT+QFTPCFG=“transmode”[,<transm
ode>]
Response
If <transmode> is not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “transmode”,<transmode>
OK
Write Command
AT+QFTPCFG=“contextid”[,<contextI
D>]
Response
If <contextID> is not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “contextid”,<contextID>
OK
Write Command
AT+QFTPCFG=“rsptimeout”[,<timeou
t>]
Response
If <timeout> is not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “rsptimeout”,<timeout>
OK
Write Command
AT+QFTPCFG=“ssltype”[,<ssl_type>]
Response
If <ssl_type> is not omitted:
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “ssltype”,<ssl_type>
OK
Write Command
AT+QFTPCFG=“sslctxid”[,<sslctxID>
Response
If <sslctxID> is not omitted:
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Parameter
]
OK
or
+CME ERROR: <err>
Else query the current settings:
+QFTPCFG: “sslctxid”,<sslctxID>
OK
<username> String type, the user name for the authentication. The maximum size of the
parameter is 50 bytes
<password> String type, the password for the authentication. The maximum size of the
parameter is 50 bytes
<contextID> Integer type, the PDP context ID, the range is 1-20. It should be activated by
AT+QIACT before QFTPOPEN. For details, please refer to Quectel_WCDMA_
UGxx_TCPIP_AT_Commands_Manual
<file_type> Integer type, indicates the type of transferred data isASCII or binary data
0 Binary
1 ASCII
<transmode> Integer type, indicates whether the FTP server or client listens to data connection
0 Active mode, module will listen to data connection
1 Passive mode, FTP server will listen to data connection
<timeout> Integer type, the range is 20-180, the unit is second, and the default value is 90s.
Generally, it is the timeout value for most +QFTPXXX: xx,xx after the result code
OK is returned, except the commands QFTPPUT/QFTPGET/QFTPLST/
QFTPNLST. The rules for these four commands are shown as below:
1) When the command has been sent, but “CONNECT” has not been output
yet, this parameter indicates the maximum interval time for “CONNECT”
outputting after the command has been sent
2) When the module has entered into data mode, this parameter indicates the
maximum interval time between two packets of received/transmitted data
3) When the <local name> is not “COM:”, it indicates the maximum interval
time between two packets of received/transmitted data
<ssl_type> Integer type, indicates the module plays as FTP client or FTPS client
0 FTP client
1 FTPS client
<sslctxID> Integer type, indicates the SSL context ID. The range is 0-5. It should be
configured byAT+QSSLCFG, for more details, please refer to Quectel_WCDMA_
UGxx _SSL_AT_Commands_Manual.
<err> Integer type, indicates the error code of the operation. It is the type of error
(Please refer to the Chapter 4)
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2.2. AT+QFTPOPEN Login to FTP Server
This command is used to login to FTP server. You should activate the PDP context by AT+QIACT first.
“+QFTPOPEN: <err>,<protocol_error>” indicates the result of QFTPOPEN and it should be output in
<timeout> set by AT+QFTPCFG.
Parameter
Example
AT+QFTPOPEN=“quectel.3322.org”,21 //Login to FTP server
OK
+QFTPOPEN: 0,0
AT+QFTPOPEN Login to FTP Server
Test Command
AT+QFTPOPEN=?
Response
+QFTPOPEN: <hostname>,<port>
OK
Write Command
AT+QFTPOPEN=<hostname>[,<port>
]
Response
OK
+QFTPOPEN: <err>,<protocol_error>
or
+CME ERROR: <err>
<hostname> String type, the IP address or domain name of the FTP server. The maximum size
of the parameter is 50 bytes
<port> Integer type, the port of the FTP server. The default value is 21
<err> Integer type, indicates the operation error code. It is the type of error (Please refer
to the Chapter 4)
<protocol_error> Integer type, for reference only, indicates the original error code from FTP server
which is defined in FTP protocol (Please refer to Chapter 5). If it is 0, it is
meaningless
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2.3. AT+QFTPCWD Set the Current Directory on FTP Server
Set the current directory on FTP server. If OK is returned, “+QFTPCWD: <err>,<protocol_error>” should
be output in <timeout> set by AT+QFTPCFG. All the files and directory operation will be set in the current
directory.
Parameter
2.4. AT+QFTPPWD Get the Current Directory on FTP Server
Get the current directory on FTP server. If OK is returned, “+QFTPPWD: 0,<path_name>” or
“+QFTPPWD: <err>,<protocol_error>” should be output in <timeout> set by AT+QFTPCFG.
AT+QFTPCWD Set the Current Directory on FTP Server
Test Command
AT+QFTPCWD=?
Response
+QFTPCWD: <path_name>
OK
Write Command
AT+QFTPCWD=<path_name>
Response
OK
+QFTPCWD: <err>,<protocol_error>
or
+CME ERROR: <err>
<path_name> String type, a directory path on FTP server. The maximum size of the parameter is
100 bytes. The root path of FTP server is “/”
<err> Integer type, indicates the operation error code. It is the type of error (Please refer
to the Chapter 4)
<protocol_error> Integer type, for reference only, indicates the original error code from FTP server
which is defined in FTP protocol (Please refer to Chapter 5). If it is 0, it is
meaningless
AT+QFTPPWD Get the Current Directory on FTP Server
Test Command
AT+QFTPPWD=?
Response
OK
Execute Command
AT+QFTPPWD
Response
OK
If successfully get the current directory:
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Parameter
2.5. AT+QFTPPUT Upload a File to FTP Server
Upload file to FTP server. The file data can be uploaded from COM port, and the module will enter into
data mode, you may input “+++” to abort the file uploading. You can also upload a local file to FTP server.
The file can be RAM file. You can upload a file to RAM by AT+QFUPL (For details, please refer to
Quectel_WCDMA_UGxx_FILE_AT_Commands_Manual). And then use QFTPPUT command to upload it
to FTP server, after uploading file successfully, you can delete the file by AT+QFDEL (For details, please
refer to Quectel_WCDMA_UGxx_FILE_AT_Commands_Manual).
You can upload a file from specified file position by the <startpos> parameter. If the <local_name> is
“COM:”, “CONNECT” should be output in <timeout> set by AT+QFTPCFG. If the <local_name> is not
“COM:”, “OK” will be output first, +QFTPPUT: 0,<transferlen> will be output after data being transferred
completely.
If the module has entered data mode, the <timeout> set byAT+QFTPCFG indicates the maximum interval
time between two packets of received/transmitted data. If the <local name> is not “COM:”, the <timeout>
set by AT+QFTPCFG indicates the maximum interval time between two packets of received/transmitted
data.
+QFTPPWD: 0,<path_name>
Else fail to get current directory:
+QFTPPWD: <err>,<protocol_error>
or
+CME ERROR: <err>
<path_name> String type, a directory path on FTP server. The root path of FTP server is “/”
<err> Integer type, indicates the operation error code. It is the type of error (Please refer
to the Chapter 4)
<protocol_error> Integer type, for reference only, indicates the original error code from FTP server
which is defined in FTP protocol (Please refer to Chapter 5). If it is 0, it is
meaningless
AT+QFTPPUT Upload a File to FTP Server
Test Command
AT+QFTPPUT=?
Response
+QFTPPUT:
<file_name>,<local_name>,<startpos>,<uploadlen>,<beo
f>
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Parameter
OK
Write Command
AT+QFTPPUT=<file
name>,“COM:”[,<startpos>[,<upload
len >,<beof>]]
Response
CONNECT
<Input file data>
OK
If successfully upload the data:
+QFTPPUT: 0,<transferlen>
Else fail to upload the data:
+QFTPPUT: <err>,<protocol_error>
or
+CME ERROR: <err>
Write Command
AT+QFTPPUT=<file_name>,<local_na
me>[,<startpos>]
<local name> is not “COM:”
Response
OK
If successfully upload the data:
+QFTPPUT: 0,< transferlen>
Else fail to upload the data:
+QFTPPUT: <err>,<protocol_error>
or
+CME ERROR: <err>
<file_name> String type, the file name in FTP server. The maximum size of the parameter is 50
bytes
<local_name> String type, the local file name. The maximum size of the parameter is 60 bytes. If
it is “COM:”, the file data will be input from COM port
If it starts with “RAM:”, the file is from RAM. After being uploaded successfully,
you should delete the file by AT+QFDEL (For details, please refer to Quectel_
WCDMA_UGxx_FILE_AT_Commands_Manual)
<startpos> Integer type, the start position of file to be put. The default value is 0. If the
<uploadlen> and <beof> is specified, the <startpos> should be consequent for
uploading data to the same file
<uploadlen> Integer type, length of data to be uploaded. It is valid only if <local_name> is
“COM:”. When data from COM reached <uploadlen>, module will exit from data
mode
<beof> Integer type, indicates whether it is the last packet of data to be uploaded
0 Not the last packet of data, when data reached <uploadlen>, module will exit
from data mode, “+QFTPPUT: 0,<transferlen>” will be output, but not close
data connection, so you can continue to upload data to the same file on FTP
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Example
//Upload a file from COM port to FTP server.
AT+QFTPPUT=“test.txt”, “COM:”,0 //All data will be saved as “test.txt” in FTP server.
CONNECT
<Input file data >
<+++>
OK
+QFTPPUT: 0,1000
//Upload a file from COM to FTP server twice, each time in 1024 bytes.
AT+QFTPPUT=“test.txt”, “COM:”,0,1024,0 //It is not the last 1024 bytes of “test.txt”.
CONNECT
<Input file data>
OK //Data length reaches 1024.
+QFTPPUT: 0,1024
AT+QFTPPUT=“test.txt”, “COM:”,1024,1024,1 //It is the last 1024 bytes of “test.txt”.
CONNECT
<Input file data>
OK //Data length reaches 1024.
+QFTPPUT: 0,1024
//Upload a file from RAM to FTP server.
AT+QFUPL=“RAM:test1.txt”,1000,300,1 //Upload a file to RAM, the file will be saved as “test1.txt”
and the maximum size of file is 1000. 300 indicates
timeout, 1 indicates ACK mode. (Please refer to
Quectel_WCDMA_UGxx_FILE_AT_Commands_Manual).
CONNECT
<Input 1000 bytes data>
+QFUPL: 1000,707
1 The last packet of data, when data reached <uploadlen>, module will exit
from data mode and close data connection, “+QFTPPUT: 0,<transferlen>”
will be output
<transferlen> Integer type, length of successfully transferred data
<err> Integer type, indicates the operation error code. It is the type of error (Please refer
to the Chapter 4)
<protocol_error> Integer type, for reference only, indicates the original error code from FTP server
which is defined in FTP protocol (Please refer to Chapter 5). If it is 0, it is
meaningless
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OK
AT+QFLST=“RAM:*”
+QFLST: “RAM:test1.txt”,1000
OK
AT+QFTPPUT=“test.txt”, “RAM:test1.txt”,0 //Upload “RAM:test1.txt” to FTP server and save it as
“test.txt” on FTP server.
OK
+QFTPPUT: 0,1000
AT+QFTPDEL=“test.txt”
OK
+QFTPDEL: 0,0
2.6. AT+QFTPGET Download a File from FTP Server
Download a file from FTP server. You can output the file to COM port by
AT+QFTPGET=“filename”,“COM:”. The module will enter data mode on receiving data from server. After
data is transferred completely, the module will exit from data mode automatically and output “QFTPGET:
0,<transferlen>”. You can save the file to RAM by AT+QFTPGET=“filename”,“RAM:localname”. After file
being transferred completely, the module will output “+QFTPGET: 0,<transferlen>”.
If the <local_name> is “COM:”, “CONNECT” should be output in <timeout> set by AT+QFTPCFG. If the
<local_name> is not “COM:”, “OK” will be output first, “+QFTPGET: 0,<transferlen>” will be output after
data being transferred completely.
If the module has entered data mode, the <timeout> set byAT+QFTPCFG indicates the maximum interval
time between two packets of received/transmitted data. If the <local name> is not “COM:”, the <timeout>
set by AT+QFTPCFG indicates the maximum interval time between two packets of received/transmitted
data.
AT+QFTPGET Get a File from FTP Server
Test Command
AT+QFTPGET=?
Response
+QFTPGET:
<file_name>,<local_name>,<startpos>,<downloadlen>
OK
Write Command
AT+QFTPGET=<file_name>,“COM:”[,
<startpos >[,<downloadlen>]]
Response
CONNECT
<Output file data>
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Parameter
<file_name> String type, the file name in FTP server. The maximum size of the parameter is 50
bytes
<local_name> String type, the local file name. The maximum size of the parameter is 60 bytes. If it is
“COM:”, the file data will be output to COM port. If it starts with “RAM:”, the file will be
saved to RAM. It is strongly recommended to save the file in RAM. Then you can
read the file by AT+QFREAD (For details, please refer to Quectel_WCDMA_UGxx_
FILE_AT_Commands_Manual)
<startpos> Integer type, the start position of file to get. The default value is 0
<downloadlen> Integer type, the data length to download. It is valid only if <local_name> is “COM:”. If
this parameter is specified, module will output <downloadlen> bytes to COM and exit
from data mode. You can continue to get data from <startpos> by the same AT
command if there is data left
<transferlen> Integer type, the actually transferred data length. If it is less than <downloadlen>, it
means the whole file is transferred completely
<err> Integer type, indicates the operation error code. It is the type of error (Please refer to
the Chapter 4)
<protocol_error> Integer type, for reference only, indicates the original error code from FTP server
which is defined in FTP protocol (Please refer to Chapter 5). If it is 0, it is meaningless
OK
If successfully download the file:
+QFTPGET: 0,<transferlen>
Else fail to download the file:
+QFTPGET: <err>,<protocol_error>
or
+CME ERROR: <err>
Write Command
AT+QFTPGET=<file_name>,<local_na
me>[,<startpos >]
<local_name> is not “COM:”
Response
OK
If successfully download the file:
+QFTPGET: 0,<transferlen>
Else fail to download the file:
+QFTPGET: <err>,<protocol_error>
or
+CME ERROR: <err>
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