Tee Logger

A logger that acts as a fan-out or tee; i.e. lets you sent the logs to the Serial port, but also to (for example) SYSLOG, a local server you can 'telnet' into or make it scroll in a browser window.

Example:

#include <Log.h> TelnetSerialStream telnetSerialStream = TelnetSerialStream();

void setup() {

Serial.begin(115200); Serial.println("Started (this will only show up on serial)");

... start wifi network ...

Log.addPrintStream(std::make_shared<TelnetSerialStream>(telnetSerialStream)); Log.begin();

Log.println("Hello World");

With this setup; the output "Hello World" is visible both on the Serial port; as well as on a local telnet server. So doing a telnet to the ESP32; will show this:

$ telnet 10.0.0.2 Connected to the Serial port of 10.0.0.2 Hello World

where 10.0.0.2 is the IP address of the ESP32 board. Likewise you can add a logger that sends the logging output to a syslog server; to MQTT or to a webserver. In that case you can simply open a webbrowser and connect to http://10.0.0.2 (i.e. to the IP address of the EPS32) and see the output scroll.

It is used at the https://makerspaceleiden.nl/ for its door access: https://github.com/makerspaceleiden.