Sending sensor data via UDP - arduino

Question

I'm trying to send sensor data via UDP. At the moment I'm struggling with the "packing" of the UDP packets. It says "incomingData" is not declared when I try to send it.
I would appreciate any kind of advice.
Code below.
Thank you :)
//Version 1.012
//necessary libraries
#include <SPI.h>
#include <Ethernet2.h>
#include <EthernetUdp2.h>
//Pin settings
#define CTD 19
//Network Settings
byte mac[] = { 0x90, 0xA2, 0xDA, 0x10, 0xEC, 0xAB }; //set MAC Address Ethernet Shield (Backside)
byte ip[] = { XXX, XXX, X, X }; //set IP-Address
byte gateway[] = { XXX, XXX, X, X }; //set Gateway
byte subnet[] = { 255, 255, 255, 1 }; //set Subnetmask
//local UDP port to listen on
unsigned int localPort = 4000;
//Recipient IP
IPAddress RecipientIP(127, 0, 0, 1);
//Recipient UDP port
unsigned int RecipientPort = 4444;
//Buffer for sending data
char packetBuffer[UDP_TX_PACKET_MAX_SIZE];
//EthernetUDP instance
EthernetUDP Udp;
void setup()
{
//Start Ethernet
Ethernet.begin(mac, ip);
//Start UDP
Udp.begin(localPort);
//for debug only
Serial.begin(9600);
//Serial baud rate for CTD
Serial1.begin(1200);
//Version 1.012
Serial.print("Version 1.012");
//CTD
pinMode(CTD, INPUT);
}
void loop()
{
//If CTD is sending
if (Serial1.available())
{
//read incoming data
int incomingData = Serial1.read();
//for debug only
Serial.print("Data: ");
Serial.println(incomingData, BIN);
}
//Send UDP packets
int packetSize = Udp.parsePacket();
if (packetSize) {
// read the packet into packetBufffer
Udp.read(packetBuffer, UDP_TX_PACKET_MAX_SIZE);
// send to the IP address and port
Udp.beginPacket(Udp.remoteIP(), Udp.remotePort());
Udp.write(incomingData);
Udp.endPacket();
}
}

Answer 1

In your code you have declared incomingData as int inside void loop () function inside if (Serial1.available()) .
But if the above if loop fails the incomingData will not be declared and say packetsize is greater than zero ( packet available) then if (packetSize) segment will be executed.Thus incomingData is not declared but it is used .That's why you get the error you stated.