I’m trying to send a space delimited list of integers over serial to Arduino.

I’m using strtok to split the string received, but it only ever gets the first value. What’s going on?

char received[16];

setup() {
  Serial.begin(9600);
}

void loop() {
  int bytesRead = 0;
  if (Serial.available()) {
    delay(3);  //delay to allow buffer to fill 
    if (bytesRead > 0) {
      Serial.print("Received message ");
      Serial.print(" Length: ");
      Serial.println(bytesRead); // For example: "1 2n"

      strtok_i = strtok(received, ' ');
      int m_1 = atoi(strtok_i);
      strtok_i = strtok(NULL, ' ');
      int m_2 = atoi(strtok_i);

      Serial.print("Value_one: ");
      Serial.print(m_1);
      Serial.print(" Value_two: ");
      Serial.println(m_2); // Always zero.
  }}
}