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I did some fixes, please retry.
I tested Arduino Mega with Brevo service, and it works correctly without SSL.
I also added a specified example.Please give me feedback.
Bye RenzoHi aflushe,
First of all, I think there is a serial baud rate mismatch or some communication problem.
Some MCUs and devices have different internal resistors. Try to remove the pull-up resistor and retry.
Also, check the wire and power supply as usual.
Bye RenzoHi Jules sorry for the late response,
However, I received some requests for this library, and I began to add extensive support. I developed and added numerous features. In the GitHub branch repository, you can find an updated version of the library (Beta version) that try to support SSL on port 465 also for AVR system.
If you can give me some feedback.Release v4.0.0: Add STARTTLS support and comprehensive documentation
Major Features:
– ✨ Add full STARTTLS support (port 587) for secure email transmission
– ✨ Integrate internal SSLClient for ESP32/ESP8266 STARTTLS connections
– ✨ Enhance authentication methods (AUTH LOGIN, PLAIN, CRAM-MD5)
– ✨ Add comprehensive English documentation with platform-specific tutorialsImprovements:
– 🔧 Unify client handling for better SSL/TLS compatibility
– 🔧 Improve EHLO/HELO command handling with multi-line response support
– 🔧 Enhance connection retry logic and error handling
– 🔧 Better memory management for large attachments
– 🔧 Add detailed SMTP response drain mechanismBug Fixes:
– 🐛 Fix SSLClient initialization and scope issues on ESP32
– 🐛 Fix STARTTLS upgrade sequence for proper SSL handshake
– 🐛 Correct BearSSL integration for Ethernet shields
– 🐛 Fix client reference handling in send() methodDocumentation:
– 📚 Add complete README.md with all features and examples
– 📚 Include links to mischianti.org tutorials for all platforms
– 📚 Add troubleshooting guide and Gmail configuration instructions
– 📚 Document API reference with all methods and data structures
– 📚 Add migration guide from v3.x to v4.0.0Breaking Changes:
– ⚠️ Minimum Arduino IDE version: 1.8.x
– ⚠️ ESP32 core minimum version: 2.0.x
– ⚠️ Some internal API changes (user-facing API remains compatible)Tested Platforms:
– ESP32 (WiFi + Ethernet with STARTTLS/SSL)
– ESP8266 (WiFi + Ethernet with STARTTLS/SSL)
– Arduino Mega (Ethernet with SSLClient)
– Arduino SAMD (WiFiNINA)
– STM32 (Ethernet with SSL)
– Raspberry Pi Pico W (WiFi + LittleFS)This release brings production-ready STARTTLS support making the library
compatible with modern SMTP servers requiring port 587 encryption, while
maintaining backward compatibility with implicit SSL on port 465.Bye Renzo
Hi Bruce sorry for the late response,
However, I received some requests for this library, and I began to add extensive support. I developed and added numerous features. In the GitHub branch repository, you can find an updated version of the library (Beta version) that try to support SSL on port 465 also for AVR system.
If you can give me some feedback.Release v4.0.0: Add STARTTLS support and comprehensive documentation
Major Features:
– ✨ Add full STARTTLS support (port 587) for secure email transmission
– ✨ Integrate internal SSLClient for ESP32/ESP8266 STARTTLS connections
– ✨ Enhance authentication methods (AUTH LOGIN, PLAIN, CRAM-MD5)
– ✨ Add comprehensive English documentation with platform-specific tutorialsImprovements:
– 🔧 Unify client handling for better SSL/TLS compatibility
– 🔧 Improve EHLO/HELO command handling with multi-line response support
– 🔧 Enhance connection retry logic and error handling
– 🔧 Better memory management for large attachments
– 🔧 Add detailed SMTP response drain mechanismBug Fixes:
– 🐛 Fix SSLClient initialization and scope issues on ESP32
– 🐛 Fix STARTTLS upgrade sequence for proper SSL handshake
– 🐛 Correct BearSSL integration for Ethernet shields
– 🐛 Fix client reference handling in send() methodDocumentation:
– 📚 Add complete README.md with all features and examples
– 📚 Include links to mischianti.org tutorials for all platforms
– 📚 Add troubleshooting guide and Gmail configuration instructions
– 📚 Document API reference with all methods and data structures
– 📚 Add migration guide from v3.x to v4.0.0Breaking Changes:
– ⚠️ Minimum Arduino IDE version: 1.8.x
– ⚠️ ESP32 core minimum version: 2.0.x
– ⚠️ Some internal API changes (user-facing API remains compatible)Tested Platforms:
– ESP32 (WiFi + Ethernet with STARTTLS/SSL)
– ESP8266 (WiFi + Ethernet with STARTTLS/SSL)
– Arduino Mega (Ethernet with SSLClient)
– Arduino SAMD (WiFiNINA)
– STM32 (Ethernet with SSL)
– Raspberry Pi Pico W (WiFi + LittleFS)This release brings production-ready STARTTLS support making the library
compatible with modern SMTP servers requiring port 587 encryption, while
maintaining backward compatibility with implicit SSL on port 465.Bye Renzo
Hi Erick sorry for the late response,
However, I received some requests for this library, and I began to add extensive support. I developed and added numerous features. In the GitHub branch repository, you can find an updated version of the library (Beta version) that can solve the problem.
If you can give me some feedback.Release v4.0.0: Add STARTTLS support and comprehensive documentation
Major Features:
– ✨ Add full STARTTLS support (port 587) for secure email transmission
– ✨ Integrate internal SSLClient for ESP32/ESP8266 STARTTLS connections
– ✨ Enhance authentication methods (AUTH LOGIN, PLAIN, CRAM-MD5)
– ✨ Add comprehensive English documentation with platform-specific tutorialsImprovements:
– 🔧 Unify client handling for better SSL/TLS compatibility
– 🔧 Improve EHLO/HELO command handling with multi-line response support
– 🔧 Enhance connection retry logic and error handling
– 🔧 Better memory management for large attachments
– 🔧 Add detailed SMTP response drain mechanismBug Fixes:
– 🐛 Fix SSLClient initialization and scope issues on ESP32
– 🐛 Fix STARTTLS upgrade sequence for proper SSL handshake
– 🐛 Correct BearSSL integration for Ethernet shields
– 🐛 Fix client reference handling in send() methodDocumentation:
– 📚 Add complete README.md with all features and examples
– 📚 Include links to mischianti.org tutorials for all platforms
– 📚 Add troubleshooting guide and Gmail configuration instructions
– 📚 Document API reference with all methods and data structures
– 📚 Add migration guide from v3.x to v4.0.0Breaking Changes:
– ⚠️ Minimum Arduino IDE version: 1.8.x
– ⚠️ ESP32 core minimum version: 2.0.x
– ⚠️ Some internal API changes (user-facing API remains compatible)Tested Platforms:
– ESP32 (WiFi + Ethernet with STARTTLS/SSL)
– ESP8266 (WiFi + Ethernet with STARTTLS/SSL)
– Arduino Mega (Ethernet with SSLClient)
– Arduino SAMD (WiFiNINA)
– STM32 (Ethernet with SSL)
– Raspberry Pi Pico W (WiFi + LittleFS)This release brings production-ready STARTTLS support making the library
compatible with modern SMTP servers requiring port 587 encryption, while
maintaining backward compatibility with implicit SSL on port 465.Bye Renzo
Wait, for w5500 I do this work that I think can be suitable also for Mega
STM32 send emails with attachments and SSL (like Gmail): w5500, enc28j60, SD, and SPI Fash
Give me a feedback Renzo
Hi Jules,
You are right, I try to upgrade the EmailSender, but for Mega I think the requirements for 587 are too high.
Keep in touch.
Bye RenzoHi Bruce,
The library supports only SSL/TLS handled on port 465, the EmailSender library doesn’t support the STARTTLS command required for port 587.
I try to upgrade in the future, but now you can check the tutorial on this site.Send emails with attachments: Arduino SAMD boards (WiFiNINA) – 3
Bye Renzo
Hi Gadzilla,
I think you use the AUX pin to wake up the Arduino, and you read the buffer immediately.
If you lost a byte, there is a problem on the transmission channel or in the wake timing; you must check the power and the wake time.
The management of send and receive is controlled by the device and work good (in general).
Bye RenzoHi Elija,
to avoid voltage drops and ensure stable power for your E220-900T30D module, don’t power it from the Arduino’s 5V pin—the onboard regulator can’t supply enough current during transmission.Instead, use a DC-DC buck converter to step down your 6V battery directly to 5V and power the E220 module from that. Add a large capacitor (470 µF + 0.1 µF) close to the E220’s VCC/GND to handle current spikes.
This setup will provide stable voltage and allow the E220 to transmit at full power without brownouts.
Bye Renzo
Hi Wany,
Generally, the problem can be generated by noise on wiring or insufficient power.I suggest performing a full connection, setting an external power supply, and then retrying.
Bye Renzo
