#include <ErriezSerialTerminal.h>

// Newline character '\r' or '\n'
char newlineChar = '\n'; 
// Separator character between commands and arguments
char delimiterChar = ' ';

// Create serial terminal object
SerialTerminal term(newlineChar, delimiterChar);


void setup()
{
    // Initialize serial port
    Serial.begin(115200);
    
    // Initialize the built-in LED
    pinMode(LED_BUILTIN, OUTPUT);
    digitalWrite(LED_BUILTIN, LOW);
}

void setup()
{
    ...

    // Add command callback handlers
    term.addCommand("?", cmdHelp);
    term.addCommand("help", cmdHelp);
    term.addCommand("on", cmdLedOn);
    term.addCommand("off", cmdLedOff);
}

void cmdHelp()
{
    // Print usage
    Serial.println(F("Serial terminal usage:"));
    Serial.println(F("  help or ?          Print this usage"));
    Serial.println(F("  on                 Turn LED on"));
    Serial.println(F("  off                Turn LED off"));
}

void cmdLedOn()
{
    // Turn LED on
    Serial.println(F("LED on"));
    digitalWrite(LED_BUILTIN, HIGH);
}

void cmdLedOff()
{
    // Turn LED off
    Serial.println(F("LED off"));
    digitalWrite(LED_BUILTIN, LOW);
}

void setup()
{   
    ...

    // Set default handler for unknown commands
    term.setDefaultHandler(unknownCommand);
}

void unknownCommand(const char *command)
{
    // Print unknown command
    Serial.print(F("Unknown command: "));
    Serial.println(command);
}

void loop()
{
    // Read from serial port and handle command callbacks
    term.readSerial();
}

char *arg;

// Get next argument
arg = term.getNext();
if (arg != NULL) {
    Serial.print(F("Argument: "));
    Serial.println(arg);
} else {
    Serial.println(F("No argument"));
}

char *arg;

// Get remaining characters
arg = term.getRemaining();
if (arg != NULL) {
    Serial.print(F("Remaining: "));
    Serial.println(arg);
}

term.clearBuffer();

term.setSerialEcho(true); //Enable Character Echoing

void setup()
{   
    ...

    // Set handler to be run AFTER a command has been handled.
    term.setPostCommandHandler(postCommandHandler);
}

void setPostCommandHandler()
{
    // Print '> ' for a primitive user UI
    Serial.print(F("> "));
}