server.on -> loop

Using Arduino Programming Questions
#1

What am I doing wrong.. Seems that I can't put a loop in server.on( { }

How am I supposed to do it, if I wanna do it the right way?

      server.on("/blink", [](){
      // the loop function runs over and over again forever
          void loop() {
            digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
            delay(1000);                       // wait for a second
            digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
            delay(1000);                       // wait for a second
          }
  });
#2

Seems that I can't put a loop in server.on

Sure you can. You should NOT be defining loop() in the body of the lambda expression, though. You can use ANY kind of looping construct, though.

#3

Did you try this?

server.on("/blink", []() {
  // the loop function runs over and over again forever
  loop();
});

 void loop() {
    digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);                       // wait for a second
  }
#4

johnwasser:
Did you try this?

server.on("/blink", []() {

// the loop function runs over and over again forever
 loop();
});

void loop() {
   digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
   delay(1000);                       // wait for a second
   digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
   delay(1000);                       // wait for a second
 }

use an anonymous function to call unique function... why?

the problem in the code is (as Paul pointed out) is the issue with declaring a (very poorly named) function within the lambda. a looping construct can certainly be put into the lambda.

the OP may not literally want "the loop function runs over and over again forever" it looks like a cut and paste issue to me.

#5

So you think they meant one of these?

server.on("/blink", []() {
  // the loop function runs over and over again forever
  digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
  delay(1000);                       // wait for a second
  digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);                       // wait for a second
});

server.on("/blink", []() {
  // the loop function runs over and over again forever
  while (true) {
    digitalWrite(ledPin, HIGH);   // turn the LED on (HIGH is the voltage level)
    delay(1000);                       // wait for a second
    digitalWrite(ledPin, LOW);    // turn the LED off by making the voltage LOW
    delay(1000);     // wait for a second
  }
});
#6

In that last example, the while loop will never end, and the server will ever get a chance to process another client request.

OP: I think you simply need to set a flag in the lambda expression, and deal with toggling the LED in loop(), if the flag is set.

#7