Hello all

A very nice solution exists:
Use this library:
[url][/https://github.com/gpepe/esp8266-sendemail]
And this program: [/
#include <WiFi.h>
#include <sendemail.h>
/*
* to enable/disable debug on Serial: Please see sendemail.h
*
*/
const char* SSID = "------";
const char* PASS ...

thank you for your reply
Maybe I misunderstood the operation of the internal RTC, but I did not see a function that will generate an alarm to wakeup the ESP32 :
RTC.setAlarm (ALM1_MATCH_HOURS, second (talarm), minute (talarm), hour (talarm), 0);

900MHz is very good for the penetration of buildings ...

There are two important things missing:
Real deepsleep which restarts at the main loop without redoing an init, and a real time clock with an alarm wakeup identical to the functionality of the chip DS3231 .
If possible RF Lora 868/915 Mhz or new wifi 900 Mhz (802.11Ah).