Scratching my head with a ATWINC1500

Hey guys,

So I've been working on my project, and hit a small snag. This code is running on a Adafruit Feather M0 Wi-Fi. It's getting stuck on
while (client.available()) {
char c = client.read();
data = data+c;
}

and I can't figure out why. It works perfectly when the code is in setup instead of it's own function. Could I have a little help? XD

#include <SPI.h>
#include <WiFi101.h>
#include "arduino_secrets.h" 
///////please enter your sensitive data in the Secret tab/arduino_secrets.h
char ssid[] = SECRET_SSID;        // your network SSID (name)
char pass[] = SECRET_PASS;    // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;            // your network key Index number (needed only for WEP)

int status = WL_IDLE_STATUS;
// if you don't want to use DNS (and reduce your sketch size)
// use the numeric IP instead of the name for the server:
IPAddress server(10,13,3,201);  // numeric IP for Google (no DNS)

// Initialize the Ethernet client library
// with the IP address and port of the server
// that you want to connect to (port 80 is default for HTTP):
WiFiClient client;

void setup() {
  WiFi.setPins(8,7,4,2);
  //Initialize serial and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect. Needed for native USB port only
  }

  // check for the presence of the shield:
  if (WiFi.status() == WL_NO_SHIELD) {
    Serial.println("WiFi shield not present");
    // don't continue:
    while (true);
  }

  // attempt to connect to WiFi network:
  while (status != WL_CONNECTED) {
    Serial.print("Attempting to connect to SSID: ");
    Serial.println(ssid);
    status = WiFi.begin(ssid, pass);
    delay(10000);
  }
  Serial.println("Connected to wifi");
  printWiFiStatus();
  activateConnection();
  
}

void loop() {
  // if there are incoming bytes available
  // from the server, read them and print them:
  //while(true);
}


void printWiFiStatus() {
  // print the SSID of the network you're attached to:
  Serial.print("SSID: ");
  Serial.println(WiFi.SSID());

  // print your WiFi shield's IP address:
  IPAddress ip = WiFi.localIP();
  Serial.print("IP Address: ");
  Serial.println(ip);

  // print the received signal strength:
  long rssi = WiFi.RSSI();
  Serial.print("signal strength (RSSI):");
  Serial.print(rssi);
  Serial.println(" dBm");
}

void activateConnection() {
  String data = "";
  Serial.println("\nStarting connection to server...");
  // if you get a connection, report back via serial:
  String PostData = "uuid=abcd";
  if (client.connect(server, 80)) {
    Serial.println("connected to server");
    // Make a HTTP request:
    client.println("POST /API/activate HTTP/1.1");
    client.println("User-Agent: Arduino/1.0");
    client.println("Host: 10.13.3.201");
    client.println("Content-Type: application/x-www-form-urlencoded");
    client.print("Content-Length: ");
    client.println(PostData.length());
    client.println();
    client.println(PostData);
    client.println("Connection: close");
  }
  while (client.available()) {
    char c = client.read();
    data = data+c;
  }
  int i = data.length();
  i = i - 27;
  data.remove(0, i);
  Serial.println(data);
  if (!client.connected()) {
    Serial.println();
    Serial.println("disconnecting from server.");
    client.stop();
  }
}