Problem: UDP Wraped with If Statement

Projects Programming
7

PaulS:
So, you have some expectations. You have some code that does something. What it does isn't exactly clear. What is clear is that what it does isn't in line with your expectations.

So, I'll ask again. Where are your debug statements? Where is your debug output?

Here's the code (written a bit differently) but with the debugging statements. This only prints to console once and doesn't send any UDP packets. After printing once to the console it kinda exits the loop (!):

#include <SPI.h>
#include <Ethernet.h>
#include <EthernetUdp.h>
#include <MuxShield.h>

int IO1DigitalVals[16];
int IO2DigitalVals[16];
int IO3DigitalVals[16];

byte valueInBytes[16];

//Initialize the Mux Shield
MuxShield muxShield;

byte arduinoMac[] = { 0xDE, 0xAD, 0xBE, 0xEF, 0xFE, 0xED };
IPAddress arduinoIP(192, 168, 1, 192); // desired IP for Arduino
unsigned int arduinoPort = 8888;      // port of Arduino

IPAddress receiverIP(192, 168, 1, 135); // IP of udp packets receiver
unsigned int receiverPort = 6000;      // port to listen on my PC

EthernetUDP Udp;


void setup() {
  Ethernet.begin(arduinoMac,arduinoIP);
  Udp.begin(arduinoPort);

  muxShield.setMode(1,DIGITAL_IN_PULLUP);  //use DIGITAL_IN in place of DIGITAL_IN_PULLUP if internal pullups are not needed
  muxShield.setMode(2,DIGITAL_IN_PULLUP);
  muxShield.setMode(3,DIGITAL_IN_PULLUP);

  for (int i=0; i<16; i++) {
    IO1DigitalVals[i] = 1;
    IO2DigitalVals[i] = 1;
    IO3DigitalVals[i] = 1;
  }

  Serial.begin(9600);
}

void loop() {
  int evt;
 
  evt = 0;

 
  for (int i=0; i < 16; i++) {
    //Digital read on all 16 inputs on IO1, IO2, and IO3
   
    int v1 = muxShield.digitalReadMS(1, i);
    int v2 = muxShield.digitalReadMS(2, i);
    int v3 = muxShield.digitalReadMS(3, i);
   
    if ((v1 != IO1DigitalVals[i]) || (v2 != IO2DigitalVals[i]) || (v3 != IO3DigitalVals[i])) {
      IO1DigitalVals[i] = v1;
      IO2DigitalVals[i] = v2;
      IO3DigitalVals[i] = v3;
     
      evt = 1;
    }
  }
  if (evt) {  
    for(int i=0;i<16;i++) {
      valueInBytes[i] = (char) IO1DigitalVals[i];
     
      if (IO1DigitalVals[i] == 0) {
        Serial.print("port 1 \n");
      }
      if (IO2DigitalVals[i] == 0) {
        Serial.print("port 2 \n");
      }
      if (IO3DigitalVals[i] == 0) {
        Serial.print("port 3 \n");
      }
    }
    Udp.beginPacket(receiverIP, receiverPort); //start udp packet
    Udp.write(valueInBytes, 16); //write sensor data to udp packet
    Udp.endPacket(); // end packet
  }

}