[Renzo Mischianti]

Hi 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

[Renzo Mischianti]

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

[Renzo Mischianti]

Hi Gmed,
you must install the library.
Bye Renzo

[Renzo Mischianti]

Hi Pashazaur,
Yes, the power supply is very important for raising a good distance, and the antenna is also very important.
Bye Renzo

[Renzo Mischianti]

Hi Gilles,
As you write, it’s very difficult to find a provider without SSL or TSL. If I have some additional information, I will write here.
Bye Renzo

[Renzo Mischianti]

Hi,

I think this can be helpfull, I use GMail but I found this doc.

✅ Free SMTP Services Supporting SSL (Port 465)

🔹 Brevo (formerly Sendinblue)

• SMTP with SSL (465): ✅ Supported

• Free tier: 300 emails/day

• SMTP server: smtp-relay.brevo.com

• Port: 465 (SSL)

• Authentication: Email + API key (as password)

• Domain verification required: ✅

• Link: https://www.brevo.com

---

🔹 Mailjet

• SMTP with SSL (465): ✅ Supported

• Free tier: 200 emails/day (6,000/month)

• SMTP server: in-v3.mailjet.com

• Port: 465

• Authentication: API key + secret

• Domain verification: Recommended

• Link: https://www.mailjet.com

---

🔹 Elastic Email

• SMTP with SSL (465): ✅ Supported

• Free tier: ~100 emails/day (changes often)

• SMTP server: smtp.elasticemail.com

• Port: 465

• Authentication: Email + API Key

• Note: May require verified domain to avoid blacklisting

• Link: https://elasticemail.com

---

🔹 Yandex Mail (personal)

• SMTP with SSL (465): ✅ Supported

• Free tier: No public limits, but throttling may apply

• SMTP server: smtp.yandex.com

• Port: 465

• Authentication: Yandex username/password

• Note: Suitable for personal use — supports SSL directly

• Link: https://mail.yandex.com

 

Give us some feedback. Bye, Renzo

[Renzo Mischianti]

Hi pashazaur,
you can follow the steps for E32 that you can find here.

Ebyte LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) microcontroller and new WeMos D1 mini shield – Part 7

Bye Renzo

[Renzo Mischianti]

Hi Zemmo,
There can be various problems, but I think a good way to do that is to change the library to use the native stack of ESP32, and you can prevent any issues with authentication.
You can find more info here.

Integrating W5500 with ESP32 Using Core 3: Native Ethernet Protocol Support with SSL and Other Features

Could you give us feedback about the result and if the problem continues we are going to look into the problem in depth.

Bye Renzo

[Renzo Mischianti]

Hi Boby,
Yes, you are right, I implemented the Arduino GIGA R1 WiFi only on EmailSender, so for now it isn’t supported by that, sorry.
I try to update the library in the future.
Bye Renzo

[Renzo Mischianti]

Hi boby,
the configuration is wrong, the correct section you must modify is this

// Arduino MBED microcontrollers configuration LIKE Arduino GIGA
#ifndef DEFAULT_EMAIL_NETWORK_TYPE_ARDUINO_MBED
	#define DEFAULT_EMAIL_NETWORK_TYPE_MBED NETWORK_MBED_WIFI
	#define DEFAULT_INTERNAL_ARDUINO_MBED_STORAGE STORAGE_NONE
	#define DEFAULT_EXTERNAL_ARDUINO_MBED_STORAGE STORAGE_SD
#endif

and the network you must use is this

#define NETWORK_MBED_WIFI	(14)	// Arduino GIGA R1 WiFi

Bye Renzo

• This reply was modified 7 months ago by Renzo Mischianti.

[Renzo Mischianti]

Put in substitution of the original SD.begin declaration.
Bye Renzo

[Renzo Mischianti]

Hi,
you can find an example here.

Check also the documentation here.
FTP Server using ESP32 with SD Card

Bye Renzo

[Renzo Mischianti]

Hi Gadzilla,

Just to clarify: the library doesn’t add any extra bytes—the E22 module sends the wake‑up preamble on its own. If you notice missing characters, it usually means the MCU hasn’t woken up quickly enough to catch the start of the UART stream.

Please try lengthening the WOR period so the receiver stays awake a bit longer, and let me know if that solves the problem.

Best,
Renzo

[Renzo Mischianti]

Hi Pataone,
This can be generated by noise on the channel. I have already heard of problems like that. When I have some time, I will fix it via code and release a flag to bypass that problem.
Bye Renzo

[Renzo Mischianti]

Hi Pataone,
This can be generated by noise on the channel. I have already heard of problems like that. When I have some time, I will fix it via code and release a flag to bypass that problem.
Bye Renzo

[Author]

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