添加智能灯固件代码

firmware/esp-idf/wumei-smart-firmware/examples/protocols/smtp_client/README.md

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+# SMTP Client Example
+
+The Example is SMTP client demo. It sends and email with attachment to recipient.
+
+
+## How to use the example
+
+
+### Configure the project
+
+```
+idf.py menuconfig
+```
+
+* Configure Wi-Fi or Ethernet under "Example Connection Configuration" menu. See "Establishing Wi-Fi or Ethernet Connection" section in [examples/protocols/README.md](../README.md) for more details.
+
+Please set the following parameters under example config for SMTP client demo to work:
+  - Email server, port, sender's email ID, password, recipient's email ID.
+
+
+### Build and Flash
+
+Build the project and flash it to the board, then run monitor tool to view serial output:
+
+```
+idf.py -p PORT flash monitor
+```
+
+(Replace PORT with the name of the serial port to use.)
+
+(To exit the serial monitor, type ``Ctrl-]``.)
+
+See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.
+
+
+
+## Example output
+
+```
+I (3212) smtp_example: Loading the CA root certificate...
+I (3212) smtp_example: Setting hostname for TLS session...
+I (3222) smtp_example: Setting up the SSL/TLS structure...
+I (3232) smtp_example: Connecting to smtp.googlemail.com:587...
+I (3542) smtp_example: Connected.
+
+220 smtp.googlemail.com ESMTP r62sm20390571pfc.89 - gsmtp
+I (3952) smtp_example: Writing EHLO to server...
+
+250-smtp.googlemail.com at your service, [182.75.158.118]
+250-SIZE 35882577
+250-8BITMIME
+250-STARTTLS
+250-ENHANCEDSTATUSCOD
+ES
+250-PIPELINING
+250-CHUNKING
+250 SMTPUTF8
+I (4262) smtp_example: Writing STARTTLS to server...
+
+220 2.0.0 Ready to start TLS
+I (4562) smtp_example: Performing the SSL/TLS handshake...
+I (5692) smtp_example: Verifying peer X.509 certificate...
+I (5692) smtp_example: Certificate verified.
+I (5692) smtp_example: Cipher suite is TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256
+I (5702) smtp_example: Authentication...
+I (5702) smtp_example: Write AUTH LOGIN
+I (6002) smtp_example: Write USER NAME
+I (6302) smtp_example: Write PASSWORD
+I (6822) smtp_example: Write MAIL FROM
+I (7132) smtp_example: Write RCPT
+I (7432) smtp_example: Write DATA
+I (8252) smtp_example: Write Content
+I (10202) smtp_example: Email sent!
+```
+
+
+## Note:
+  - You might need to enable permission for less secure apps from email provider. This is because these email providers (e.g. gmail) insist on OAUTH authorization.