What Mb/s I can archive with ENC28J60? How much connections per sec? Thats going to depend on many factors including how bad your driver is, how big the packets are, which pins you use for SPI etc, etc. The ESP SPI driver has fairly high latency which would cut badly into bandwidth with smaller pac...

Assuming that this is not about the Burger King queue then:
https://www.freertos.org/a00018.html#xQueueReset

Lots of people use the LAN8720 for Ethernet (not sure how the Internet is special though) e.g. https://www.esp32.com/viewtopic.php?t=9607 (3) After the lan8720 is powered on, it will always output the clock signal to the GPIO 0 pin.... The basic principles are shown here https://raw.githubuserconten...

As far as I can see you would also need an MQTT server. This would mean having to; (1) Open your network to the cloud and using a cloud server, (2) Install a home server & (say) run mosquitto MQTT server, (3) roll your own ESP MQTT server. I have done (3), its some coding work but the ESP can do it....

the fan of the SDS011 Sorry, missed the earlier clues. Possibly a bit of EMC? A scope on your power lines & signal lines will let you know if there is a 'kick', if you drop 5% below rail then you will need to take action. Lots of cheap scopes on ebay etc. I assume that your grounds are good. You co...

@jimhelios

God forbid, in the EU and Japan it's CE.

Why god forbid? I have found CE easier than FCC or maybe its just my locale & experience i.e. UK teams?

What do you mean by 'I set STM8S I2C output clock frequency to 100KHz'? The I2C slave must work on the master clock or sample much higher (e.g. like a UART) but then you would have rise/fall propagation delays which you need to match with ESP specification. The slave might work using a faster clock ...

Agreed, the question is very general & misses the fact that RESTful is not transport but is a logical/semantic approach. I would however disagree with the cooking analogy - 'What tool is the best tool to make food?' Answer: Wok/Frying pan, often a roasting/baking tray, rarely a pot & never a yogurt ...

Communication distance? Data throughput? Update frequency? UPC vrs NRE cost considerations? You seem to be going wireless - is wireless a must & why?. Low power & ESP aren't natural bed fellows but its depends on above. ESP offer an all in one Wifi and BT/BLE but its a dual core & you don't need 100...

Cool, I did not see 'UART_EVENT_MAX' in your code but then 'default' should cover it. Sometimes the build system breaks. Delete '/build' and rebuild all again. An idf config update should also force a rebuild all. If not cut and paste the switch code and post a MVE. PS Go C++. It makes sense. That s...