Quectel AG35 SMTP Installation manual

AG35 SMTP

AT Commands Manual

LTE Module Series

Rev. AG35_SMTP_AT_Commands_Manual_V1.0

Date: 2017-10-13

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LTE Module Series

AG35 SMTP AT Commands Manual

AG35_SMTP_AT_Commands_Manual Confidential / Released 1 / 30

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GENERAL NOTES

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About the Document

History

Revision

Date

Author

Description

1.0

2017-10-13

Chris PENG/

Mandy WANG

Initial

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Contents

About the Document...................................................................................................................................2

Contents.......................................................................................................................................................3

Table Index...................................................................................................................................................4

1Introduction..........................................................................................................................................5

1.1. Introduction about SSL Type...................................................................................................5

1.2. The Process of Sending Email................................................................................................5

1.3. Description of Data Mode........................................................................................................7

2Description of SMTP AT Commands.................................................................................................8

2.1. AT+QSMTPCFG Configure Parameters for SMTP Server..................................................8

2.2. AT+QSMTPDST Add or Delete Recipients........................................................................10

2.3. AT+QSMTPSUB Edit the Subject of an Email ...................................................................12

2.4. AT+QSMTPBODY Edit the Body of an Email.....................................................................13

2.5. AT+QSMTPATT Add or Delete Attachments for an Email..................................................15

2.6. AT+QSMTPCLR Clear the Content of an Email.................................................................16

2.7. AT+QSMTPPUT Send an Email.........................................................................................17

3Examples ............................................................................................................................................19

3.1. Send an Email without SSL...................................................................................................19

3.2. Send an Email with SSL........................................................................................................21

3.3. Send an Email with STARTTLS............................................................................................22

4Error Handling....................................................................................................................................24

4.1. Executing SMTPAT Command Fails....................................................................................24

4.2. PDPActivation Fails..............................................................................................................24

4.3. DNS Parse Fails....................................................................................................................24

4.4. Error Response ofAT+QSMTPPUT......................................................................................25

5Summary of Error Codes ..................................................................................................................26

6Summary of SMTP Protocol Error Codes .......................................................................................28

7Appendix A References.....................................................................................................................30

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Table Index

TABLE 1: SUMMARY OF ERROR CODES ...................................................................................................... 26

TABLE 2: SUMMARY OF SMTP PROTOCOL ERROR CODES...................................................................... 28

TABLE 3: RELATED DOCUMENTS.................................................................................................................. 30

TABLE 4: TERMS AND ABBREVIATIONS........................................................................................................ 30

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1Introduction

AG35 provides SMTP application interface for sending emails. This document is a reference guide to all

the AT commands defined for SMTP.

1.1. Introduction about SSL Type

There are three kinds of connections between SMTP client and SMTP server:

Without SSL

SSL

STARTTLS

Some SMTP servers do not support connection without SSL, while some can support all of them.

Customers can choose one kind according to the mail service provider.

These three kinds of connections can be set by <ssltype> parameter in AT+QSMTPCFG=“ssltype”.

1. If <ssltype> is 0, it means “without SSL”. In this case, SSL function will not be used, and emails are

sent with insecure connection. The port of SMTP server depends on mail service provider, and it is

the port 25 usually.

2. If <ssltype> is 1, it means “SSL”. In this case, emails are sent with SSL/TLS encrypted SMTP. The

port of SMTP server depends on mail service provider, and it is the port 465 or 587 usually.

3. If <ssltype> is 2, it means “STARTTLS”. In this case, the normal insecure connection can be

upgraded to secure connection through STARTTLS function, for sending the mail data. The port of

SMTP server depends on mail service provider, and it is the port 25, 465 or 587 usually.

1.2. The Process of Sending Email

As AG35 supports SMTP protocol, customers can send emails easily by AG35 SMTP AT commands. The

general process is as follows:

Step 1: Configure and activate a PDP context.

1) Configure <APN>, <username>, <password> and other parameters of a PDP context by

AT+QICSGP. Please refer to Quectel_AG35_TCP(IP)_AT_Commands_Manual for details.

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If QoS settings need to be updated, configure them by AT+CGQMIN, AT+CGEQMIN,

AT+CGQREQ and AT+CGEQREQ commands. For more details, please refer to

Quectel_AG35_AT_Commands_Manual.

2) Activate the PDP context byAT+QIACT.

3) Configure the PDP context ID for SMTP by AT+QSMTPCFG=“contextid”,<contextID>.

Step 2: Configure SMTP server and user account.

1) Configure SSL type by AT+QSMTPCFG=“ssltype”,<ssltype>. If <ssltype> is SSL or STARTTLS,

customers should choose an SSL context by AT+QSMTPCFG=“sslctxid”,<sslctxID> and

configure the <sslctxID> by AT+QSSLCFG="ciphersuite",<sslctxID>,<ciphersuites>. For more

details about these commands, please refer to Quectel_AG35_SSL_AT_Commands_ Manual.

2) Configure SMTP server by AT+QSMTPCFG=“smtpserver”,<srvaddr>,<srvport>. <srvaddr> and

<srvport> parameters depend on the mail service provider.

3) Configure account information by AT+QSMTPCFG=“account”,<username>,<password>.

4) Configure sender information by AT+QSMTPCFG=“sender”,<sender_name>,<sender_email>.

Step 3: Edit the email content.

1) Configure the recipient email address by AT+QSMTPDST.

2) Configure the subject of email by AT+QSMTPSUB.

3) Configure the body of email by AT+QSMTPBODY.

4) Add attachments for the email by AT+QSMTPATT. The attachments can be RAM, UFS or SD

files. And the files can be uploaded to RAM, UFS or SD card by AT+QFUPL. After sending email

successfully, the file should be deleted by AT+QFDEL. For more details of these commands,

please refer to Quectel_AG35_FILE_Application_Note.

Step 4: Send email.

Send the email by AT+QSMTPPUT. It will take some time to send the email depending on the total

size of attachments and network status. When the sending action ends, “+QSMTPPUT:

<err>,<protocol_error>”will be returned.

Step 5: Clear the email content.

AT+QSMTPCLR will clear the email content configured in Step 3. The attached files should be

deleted by AT+QFDEL. For more details of these commands, please refer to

Quectel_AG35_FILE_Application_Note. Then repeat Step 3 and 4. If the SMTP server

information and user information need to be changed, then Step 2 to Step 4 should be repeated.

If emails have not been sent for a long time, such as 30 minutes or even longer, then the PDP

context should be deactivated by AT+QIDEACT=<contextID>. For more details, please refer to

Quectel_AG35_TCP(IP)_AT_Commands_Manual.

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1.3. Description of Data Mode

The COM port of AG35 module has two working modes: AT command mode and data mode. In AT

command mode, the inputted data via COM port will be treated asATcommand, while in data mode, it will

be treated as data.

Inputting “+++” or pulling up DTR (AT&D1 should be set first) can make the module exit from data mode.

To prevent the “+++” from being misinterpreted as data, the following sequence should be followed:

1) Do not input any character within 1s or longer before inputting “+++”.

2) Input “+++” within 1s, and no other characters can be inputted during the time.

3) Do not input any character within 1s after “+++” has been inputted.

When AT+QSMTPBODY is executed, the COM port will enter into data mode. All inputted data will be the

body of email. If the inputted data reaches the <body_length> or the time reaches <input_time>, the port

will exit from data mode automatically. If the inputted data is less than the <body_length>, customers can

finish editing body by inputting “+++” or changing DTR level from low to high before <input_time> reaches.

In such case, the COM port cannot reenter data mode by executingATO command.

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2Description of SMTP AT Commands

2.1. AT+QSMTPCFG Configure Parameters for SMTP Server

The command is used to configure SMTP server, user account and SSL settings. If the Write Command

only executes one parameter, it will query the current settings.

AT+QSMTPCFG Configure Parameters for SMTP Server

Test Command

AT+QSMTPCFG=?

Response

+QSMTPCFG: “account”,<username>,<password>

+QSMTPCFG: “sender”,<sender_name>,<sender_email>

+QSMTPCFG: “smtpserver”,<srvaddr>,<srvport>

+QSMTPCFG: “contextid”,(1-16)

+QSMTPCFG: “sslctxid”,(0-5)

+QSMTPCFG: “ssltype”,(0-2)

Write Command

AT+QSMTPCFG=“account”[,<userna

me>,<password>]

Response

If <username> and <password> are not omitted:

+CME ERROR: <err>

If <username> and <password> are both omitted, query the

current settings:

+QSMTPCFG: “account”,<username>,<password>

Write Command

AT+QSMTPCFG=“sender”[,<sender_

name>,<sender_email>]

Response

If <sender_name> and <sender_email> are not omitted:

+CME ERROR: <err>

If <sender_name> and <sender_email> are both omitted,

query the current settings:

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+QSMTPCFG: “sender”,<sender_name>,<sender_email>

Write Command

AT+QSMTPCFG=“smtpserver”[,<srva

ddr>,<srvport>]

Response

If <srvaddr> and <srvport> are not omitted:

+CME ERROR: <err>

If <srvaddr> and <srvport> are both omitted, query the current

settings:

+QSMTPCFG: “smtpserver”,<srvaddr>,<srvport>

Write Command

AT+QSMTPCFG=“contextid”[,<conte

xtID>]

Response

If <contextID> is not omitted:

+CME ERROR: <err>

If <contextID> is omitted, query the current settings:

+QSMTPCFG: “contextid”,<contextID>

Write Command

AT+QSMTPCFG=“sslctxid”[,<sslctxID

Response

If <sslctxID> is not omitted:

+CME ERROR: <err>

If <sslctxID> is omitted, query the current settings:

+QSMTPCFG: “sslctxid”,<sslctxID>

Write Command

AT+QSMTPCFG=“ssltype”[,<ssltype>

]

Response

If <ssltype> is not omitted:

+CME ERROR: <err>

If <ssltype> is omitted, query the current settings:

+QSMTPCFG: “ssltype”,<ssltype>

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