esp32/8266 as station and TCP or UDP server for multiple connections

 I have been working on esp32 for serial to udp or tcp server, the idea was to get serial data like GPS or NMEA to be shared over local net work.

I did this before, and found out that if your run softAP and TCP server on same core, it could "core 0 panic"

I separated then into 2 core, but still failed when 2-3 connected after a while of working.

from this post, it seems 8266 is more stable than esp32 on wifi handling?!

As broadcasting data, a UDP is more suitable than TCP, Bidirectional communication is not available for the UDP/broadcast protocol.

this seems to be a good start:

 1 Wifi communication between ESP8266 and PC using TCP/IP or UDP/broadcast protocol

I tested it with apmode and udp, but it shows ip unset

if I do it in station mode, it does not show "connected to wifi"

This one is 3 TCP to serial ports on esp32

2 https://github.com/AlphaLima/ESP32-Serial-Bridge

3 https://github.com/yuri-rage/ESP-Serial-Bridge

This fork allow UDP and 8266, but it says:"PROTOCOL_UDP (software limitation) are not available on the ESP8266."

I tested with a esp32 in ap mode and udp broadcast, the plat form is a wemos 32, 

do some config in the config file, I'm able to send data through uart to 2 udp connection, but not all received data, some lost few data. and chip get hot.

4 https://github.com/roboremo/ESP8266-WiFi-UART-Bridge

old project, designed for 8266, no broadcast, but test ok on 1 udp ap mode.

after changing as following

// adding IPAddress broadcast(192, 168, 0, 255);

// and change the to boradcast IP  udp.beginPacket(broadcast, port); 

 I tested with 3 devices all get data.


May be it would be better to do udp broadcast on 8266....




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