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From this link http://bit.ly/2ZOzm0F it's possible to download an Arduino project for the NodeMCU, which:
From this link http://bit.ly/2ZOzm0F it's possible to download an Arduino project for the NodeMCU, which:
- provides partial support of smtp and imap protocols;
- provides partial support of smtp and imap protocols;
- allows to show text on a display.
- allows to show text on a display.
The NodeMCU was discussed in this previous guide.
The NodeMCU was discussed in this previous guide.
The oled display used in the project is like the one shown in the page startingelectronics...SrohFCA, with the only difference that works at 3.3 V. The display is connected to the NodeMCU as follows:
The oled display used in the project is like the one shown in the page startingelectronics...SrohFCA, with the only difference that works at 3.3 V. The display is connected to the NodeMCU as follows:
E-mail support only allows to:
E-mail support only allows to:
- use an address with @gmail.com domain;
- use an address with @gmail.com domain;
- read the last E-mail received from certain senders, with content transfer encoding "7 bit" (for more information, for example, see https://docs.microsoft.com...help ).
- read the last E-mail received from certain senders, with content transfer encoding "7 bit" (for more information, for example, see https://docs.microsoft.com...help ).
Furthermore, the text of the E-mails (both read and written) must have a certain formatting, which will be seen later. After each successful reading, the NodeMCU sends a confirmation message to a default address. A Gmail account, in order to be used in this project, must have the "less secure app" and "IMAP" options enabled; they can be activated from the links google.com...lesssecureapps and google.com...229?hl=en.
Furthermore, the text of the E-mails (both read and written) must have a certain formatting, which will be seen later. After each successful reading, the NodeMCU sends a confirmation message to a default address. A Gmail account, in order to be used in this project, must have the "less secure app" and "IMAP" options enabled; they can be activated from the links google.com...lesssecureapps and google.com...229?hl=en.
The following images explain the behavior of the sketch.
The following images explain the behavior of the sketch.
From one of the addresses recognized by the NodeMCU, an E-mail is sent to the development board. The latter only reads the text contained between the initial "#NodeMCU:" and the final ":NodeMCU#" indices.
From one of the addresses recognized by the NodeMCU, an E-mail is sent to the development board. The latter only reads the text contained between the initial "#NodeMCU:" and the final ":NodeMCU#" indices.
The E-mail must be sent in "Plain text" mode.
The E-mail must be sent in "Plain text" mode.
If the NodeMCU correctly interprets the E-mail, it sends a confirmation message to the address specified in the sketch.
If the NodeMCU correctly interprets the E-mail, it sends a confirmation message to the address specified in the sketch.
The NodeMCU shows on the display what it processes.
The NodeMCU shows on the display what it processes.
For writing the sketch, I helped myself with the OakOLED, ESP8266SMTP and ESP32-Mail-Client libraries respectively for display support, sending and receiving E-mails. Therefore, I thank the related authors netguy204, CosmicBoris e mobizt for their works.
For writing the sketch, I helped myself with the OakOLED, ESP8266SMTP and ESP32-Mail-Client libraries respectively for display support, sending and receiving E-mails. Therefore, I thank the related authors netguy204, CosmicBoris e mobizt for their works.
Notes:
Notes:
1) the project doesn't implement all the modern security systems for the protection of data exchanged over the Internet, so it's better to avoid inserting sensitive data in the E-mails of the NodeMCU;
1) the project doesn't implement all the modern security systems for the protection of data exchanged over the Internet, so it's better to avoid inserting sensitive data in the E-mails of the NodeMCU;
2) the sketch isn't accompanied by a complete documentation;
2) the sketch isn't accompanied by a complete documentation;
3) my programming skills are not very high and aim to improve them over time; therefore pay attention, because you could find programming errors and wrong algorithms in the source code;
3) my programming skills are not very high and aim to improve them over time; therefore pay attention, because you could find programming errors and wrong algorithms in the source code;
4) the software is provided "as is", without warranty of any kind; I take no responsibility for the consequences deriving from the use of the information contained on this page.
4) the software is provided "as is", without warranty of any kind; I take no responsibility for the consequences deriving from the use of the information contained on this page.
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