Arduino uno wifi rev2 stuck inside loop

Question

It might be a stupid question but I can't figure it out. While running the code below. I want to open the box when the code matches the code in API. This all works. I can even close the box afterwords. But then I am stuck inside my loop. after the box is closed I want the screen to say box closed and then I want the void loop() to start again. so my screen asks for a code again. I tried using break and exit but no luck so far. entire code:

/* hardware libraries*/
#include <Key.h>
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
/*Wifi and request libraries*/
#include <SPI.h>
#include <WiFiNINA.h>
#include <ArduinoJson.h>
#define HIGH 0x1
#define LOW 0x0
/* wifi credentials*/
char ssid[] = "ssid"; // your network SSID (name)
char pass[] = "password"; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;
int status = WL_IDLE_STATUS;
char server[] = "parcelbox.1819.caro.deweze.nxtmediatech.eu";
// 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;
LiquidCrystal_I2C lcd(0x27, 16, 2); // lcd object
Servo myservo; //servo object
boolean boxOpenend = false ;
/* Keypad*/
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
 {'1', '2', '3'},
 {'4', '5', '6'},
 {'7', '8', '9'},
 {'*', '0', '#'}
};
byte rowPins[ROWS] = {3, 4, 5, 6};
byte colPins[COLS] = {9, 8, 7};
Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String value = "";
void setup() {
 lcd.begin(); //start lcd
 Serial.begin(9600);
 myservo.attach(A0); // attach servo to pin
 lcd.backlight(); // start screen light
 /* connect to wifi */
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 // check for the WiFi module:
 if (WiFi.status() == WL_NO_MODULE) {
 Serial.println("Communication with WiFi module failed!");
 // don't continue
 while (true);
 }
 String fv = WiFi.firmwareVersion();
 if (fv < "1.0.0") {
 Serial.println("Please upgrade the firmware");
 }
 // attempt to connect to Wifi network:
 while (status != WL_CONNECTED) {
 Serial.print("Attempting to connect to SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
 status = WiFi.begin(ssid, pass);
 // wait 10 seconds for connection:
 delay(10000);
 }
 Serial.println("Connected to wifi");
 printWifiStatus();
}
void loop() {
 lcd.clear();
 lcd.print("Geef bestelcode");
 char customKey = customKeypad.getKey(); // get the key pressed
 value = value + String(customKey);
 lcd.setCursor(0, 1);
 lcd.print(value);
 if (customKey == '#') {
 String response_Status = "";
 Serial.println("\nStarting connection to server...");
 // if you get a connection, report back via serial:
 if (client.connect(server, 80)) {
 value.remove(16);
 Serial.println(value);
 Serial.println("connected to server");
 // Make a HTTP request:
 client.println("GET /api/boxes/1444/code/" + value + " HTTP/1.1");
 client.println("Host: parcelbox.1819.caro.deweze.nxtmediatech.eu");
 client.println("Connection: close");
 client.println();
 }
 // if there are incoming bytes available
 // from the server, read them and print them:
 StaticJsonBuffer<500> jsonBuffer;
 while (client.connected()) {
 String response = "";
 bool begin = false;
 while (client.available() || !begin) {
 char c = client.read();
 if (c == '{') {
 begin = true;
 }
 if (begin) response += (c);
 if (c == '"}') {
 break;
 }
 delay(1);
 }
 int start = response.indexOf("status\":\"") + 11;
 int end = start + 3;
 response_Status = response.substring(start, end);
 JsonObject& root = jsonBuffer.parseObject(response);
 if (!root.success())
 {
 Serial.print("parseObject(");
 Serial.print(response);
 Serial.println(") failed");
 break;
 }
 Serial.println(response_Status);
 if (response_Status == "200") {
 Serial.println("200");
 boxOpenend = true;
 while (boxOpenend) {
 lcd.clear();
 lcd.print("Box openend ,press");
 lcd.setCursor(0, 1);
 lcd.print(" * to close");
 myservo.write(0);// rotate the servo to open
 delay(175);
 char key = customKeypad.getKey(); // get the key pressed
 //value = value + String(key);
 if (key == '*') {
 myservo.write(90); // rotate the servo to lock
 value = ""; // clear the string
 boxOpenend = false;
 }
 // box gaat terug toe maar ik blijf in deze loop zitten want lcd scherm blijft staan op "Box geopend , druk * om te sluiten
 }
 }
 else if (response_Status != "200") {
 Serial.println("not 200");
 lcd.clear();
 lcd.print("wrong code or");
 lcd.setCursor(0, 1);
 lcd.print("already deliverd");
 delay(175);
 value = "";
 exit;
 }
 //hier net hetzelfde
 break ;
 }
 // if the server's disconnected, stop the client:
 if (!client.connected()) {
 Serial.println();
 Serial.println("disconnecting from server.");
 client.stop();
 // do nothing forevermore:
 while (true);
 }
 exit;
 }
 if (customKey == '*') {
 myservo.write(90); // rotate the servo to lock
 value = ""; // clear the string
 }
 delay(175); // for optimal lcd screen view
}
void printWifiStatus() {
 // print the SSID of the network you're attached to:
 Serial.print("SSID: ");
 Serial.println(WiFi.SSID());
 // print your board'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");
}

This is where the code get's stuck. It keeps on showing box opened press * to close. even when I press * and the box closes it keeps on saying this

while (boxOpenend) {
 lcd.clear();
 lcd.print("Box openend ,press");
 lcd.setCursor(0, 1);
 lcd.print(" * to close");
 myservo.write(0);// rotate the servo to open
 delay(175);
 char key = customKeypad.getKey(); // get the key pressed
 //value = value + String(key);
 if (key == '*') {
 myservo.write(90); // rotate the servo to lock
 value = ""; // clear the string
 boxOpenend = false;
 }
 // box gaat terug toe maar ik blijf in deze loop zitten want lcd scherm blijft staan op "Box geopend , druk * om te sluiten
 }
 }

It might have a simple solution that I'm just not thinking of but it really bothers me!

UPDATE , We made a little progress as to figuring out why it wont work. the code that we are running now is:

/* hardware libraries*/
#include <Key.h>
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
/*Wifi and request libraries*/
#include <SPI.h>
#include <WiFiNINA.h>
#include <ArduinoJson.h>
#define HIGH 0x1
#define LOW 0x0
/* wifi credentials*/
char ssid[] = "XXXXXXX"; // your network SSID (name)
char pass[] = "XXXXXXX"; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;
int status = WL_IDLE_STATUS;
char server[] = "parcelbox.1819.caro.deweze.nxtmediatech.eu";
// 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;
LiquidCrystal_I2C lcd(0x27, 16, 2); // lcd object
Servo myservo; //servo object
boolean boxOpenend = false ;
/* Keypad*/
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
 {'1', '2', '3'},
 {'4', '5', '6'},
 {'7', '8', '9'},
 {'*', '0', '#'}
};
byte rowPins[ROWS] = {3, 4, 5, 6};
byte colPins[COLS] = {9, 8, 7};
Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String value = "";
void setup() {
 lcd.begin(); //start lcd
 Serial.begin(9600);
 myservo.attach(A0); // attach servo to pin
 lcd.backlight(); // start screen light
 /* connect to wifi */
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 // check for the WiFi module:
 if (WiFi.status() == WL_NO_MODULE) {
 Serial.println("Communication with WiFi module failed!");
 // don't continue
 while (true);
 }
 String fv = WiFi.firmwareVersion();
 if (fv < "1.0.0") {
 Serial.println("Please upgrade the firmware");
 }
 // attempt to connect to Wifi network:
 while (status != WL_CONNECTED) {
 Serial.print("Attempting to connect to SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
 status = WiFi.begin(ssid, pass);
 // wait 10 seconds for connection:
 delay(10000);
 }
 Serial.println("Connected to wifi");
 printWifiStatus();
}
void loop() {
 lcd.clear();
 lcd.print("Geef bestelcode");
 char customKey = customKeypad.getKey(); // get the key pressed
 value = value + String(customKey);
 lcd.setCursor(0, 1);
 lcd.print(value);
 if (customKey == '#') 
 {
 Serial.println("PRESSED #");
 String response_Status = "";
 Serial.println("\nStarting connection to server...");
 Serial.println("RESULT OF CLIENT.CONNECT()");
 Serial.println(client.connect(server, 80));
 // if you get a connection, report back via serial:
 if (client.connect(server, 80) == 1) 
 {
 Serial.println("IK BEN HIER");
 value.remove(4);
 Serial.println(value);
 Serial.println("connected to server");
 // Make a HTTP request:
 client.println("GET /api/boxes/1444/pin/" + value + " HTTP/1.1");
 client.println("Host: parcelbox.1819.caro.deweze.nxtmediatech.eu");
 client.println("Connection: close");
 client.println();
 } 
 else 
 {
 Serial.println("client.connect() not successfull");
 }
 // if there are incoming bytes available
 // from the server, read them and print them:
 StaticJsonBuffer<500> jsonBuffer;
 if (client.connected()) 
 {
 Serial.println("CLIENT CONNECTED");
 String response = "";
 bool begin = false;
 while (client.available() || !begin) {
 char c = client.read();
 if (c == '{') {
 begin = true;
 }
 if (begin) {
 response += (c);
 }
 if (c == '"}') {
 break;
 }
 delay(1);
 }
 int start = response.indexOf("status\":\"") + 11;
 int end = start + 3;
 response_Status = response.substring(start, end);
 Serial.println(response_Status);
 // response successfull
 if (response_Status == "200")
 {
 Serial.println("RESPONSE 200");
 Serial.println("response state == 200");
 // First open the box
 // 0° means open
 Serial.println("OPEN BOX");
 myservo.write(0);
 delay(175);
 lcd.setCursor(0, 0);
 lcd.print(" ");
 lcd.setCursor(0, 0);
 lcd.print("Box opened ,press");
 lcd.setCursor(0, 1);
 lcd.print(" ");
 lcd.setCursor(0, 1);
 lcd.print(" * to close");
 }
 else 
 {
 Serial.println("RESPONSE NOT 200");
 Serial.println("not 200");
 lcd.clear();
 lcd.print("Foute code of");
 lcd.setCursor(0, 1);
 lcd.print("al afgeleverd");
 delay(175);
 }
 }
 // reset the value
 value = "";
 }
 // lock box and reset value
 if (customKey == '*') 
 {
 Serial.println("CLOSE BOX");
 myservo.write(90); 
 value = "";
 client.stop();
 }
 delay(175); // for optimal lcd screen view
}
void printWifiStatus() {
 // print the SSID of the network you're attached to:
 Serial.print("SSID: ");
 Serial.println(WiFi.SSID());
 // print your board'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");
}

this is the serial output: serial output

it's clear that the first request the check the code goes thru but when you try a second time it comes out empty. We did some research and we found that in some cases the servo could affect the request in a bad way. Just not sure if that is correct and how to fix this

• VE7JRO: Comments are not for extended discussion; this conversation has been moved to chat.

Answer 1

/* hardware libraries*/
#include <Key.h>
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
/*Wifi and request libraries*/
#include <SPI.h>
#include <WiFiNINA.h>
#include <ArduinoJson.h>
#define HIGH 0x1
#define LOW 0x0
/* wifi credentials*/
char ssid[] = "sidd"; // your network SSID (name)
char pass[] = "pass"; // your network password (use for WPA, or use as key for WEP)
int keyIndex = 0;
int status = WL_IDLE_STATUS;
char server[] = "parcelbox.1819.caro.deweze.nxtmediatech.eu";
// 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;
LiquidCrystal_I2C lcd(0x27, 16, 2); // lcd object
Servo myservo; //servo object
boolean boxOpenend = false ;
/* Keypad*/
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
 {'1', '2', '3'},
 {'4', '5', '6'},
 {'7', '8', '9'},
 {'*', '0', '#'}
};
byte rowPins[ROWS] = {3, 4, 5, 6};
byte colPins[COLS] = {9, 8, 7};
Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String value = "";
void setup() {
 lcd.begin(); //start lcd
 Serial.begin(9600);
 myservo.attach(A0); // attach servo to pin
 lcd.backlight(); // start screen light
 /* connect to wifi */
 while (!Serial) {
 ; // wait for serial port to connect. Needed for native USB port only
 }
 /*
 // check for the WiFi module:
 if (WiFi.status() == WL_NO_MODULE) {
 Serial.println("Communication with WiFi module failed!");
 // don't continue
 while (true);
 }
 String fv = WiFi.firmwareVersion();
 if (fv < "1.0.0") {
 Serial.println("Please upgrade the firmware");
 }
 // attempt to connect to Wifi network:
 while (status != WL_CONNECTED) {
 Serial.print("Attempting to connect to SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
 status = WiFi.begin(ssid, pass);
 // wait 10 seconds for connection:
 delay(10000);
 }
 Serial.println("Connected to wifi");*/
 createConnection();
}
void loop() {
 lcd.clear();
 lcd.print("Bestelcode / pin");
 char customKey = customKeypad.getKey(); // get the key pressed
 value = value + String(customKey);
 lcd.setCursor(0, 1);
 lcd.print(value);
 if (customKey == '#')
 {
 createConnection();
 Serial.println("PRESSED #");
 String response_Status = "";
 Serial.println("\nStarting connection to server...");
 Serial.println("RESULT OF CLIENT.CONNECT()");
 Serial.println(client.connect(server, 80));
 // if you get a connection, report back via serial:
 if (client.connect(server, 80) == 1)
 { 
 int valueLen = value.length();
 if(valueLen == 5){
 Serial.println("IK BEN een pin ");
 value.remove(4);
 Serial.println(value);
 Serial.println("connected to server");
 // Make a HTTP request:
 client.println("GET /api/boxes/2025/pin/" + value + " HTTP/1.1");//1444
 client.println("Host: parcelbox.1819.caro.deweze.nxtmediatech.eu");
 client.println("Connection: close");
 client.println();
 }
 if(valueLen ==17){
 Serial.println("IK BEN een bestelcode");
 value.remove(16);
 Serial.println(value);
 Serial.println("connected to server");
 // Make a HTTP request:
 client.println("GET /api/boxes/2025/code/" + value + " HTTP/1.1");//1444
 client.println("Host: parcelbox.1819.caro.deweze.nxtmediatech.eu");
 client.println("Connection: close");
 client.println();
 }
 else{
 Serial.println("invalid amount of numbers code");
 /*lcd.clear();
 lcd.print("ongeldige code");*/
 }
 }
 else
 {
 Serial.println("client.connect() not successfull");
 }
 // if there are incoming bytes available
 // from the server, read them and print them:
 StaticJsonBuffer<500> jsonBuffer;
 if (client.connected())
 {
 Serial.println("CLIENT CONNECTED");
 String response = "";
 bool begin = false;
 while (client.available() || !begin) {
 char c = client.read();
 if (c == '{') {
 begin = true;
 }
 if (begin) {
 response += (c);
 }
 if (c == '"}') {
 break;
 }
 delay(1);
 }
 int start = response.indexOf("status\":\"") + 11;
 int end = start + 3;
 response_Status = response.substring(start, end);
 Serial.println(response_Status);
 // response successfull
 if (response_Status == "200")
 {
 Serial.println("RESPONSE 200");
 Serial.println("response state == 200");
 // First open the box
 // 0° means open
 Serial.println("OPEN BOX");
 myservo.write(0);
 delay(175);
 lcd.setCursor(0, 0);
 lcd.print(" ");
 lcd.setCursor(0, 0);
 lcd.print("Box open ,druk");
 lcd.setCursor(0, 1);
 lcd.print(" ");
 lcd.setCursor(0, 1);
 lcd.print("* om te sluiten");
 delay(5000);
 }
 else
 {
 Serial.println("RESPONSE NOT 200");
 Serial.println("not 200");
 lcd.clear();
 lcd.print("Foute code of");
 lcd.setCursor(0, 1);
 lcd.print("al geleverd");
 delay(2500);
 }
 }
 // reset the value
 value = "";
 }
 // lock box and reset value
 if (customKey == '*')
 {
 Serial.println("CLOSE BOX");
 myservo.write(90);
 value = "";
 client.stop();
 }
 delay(175); // for optimal lcd screen view
}
void createConnection() {
 // This new line is required to disconnect the previous connection otherwise
 // it will try to use the old connection and never reconnect if the connection fails
 status = WiFi.disconnect();
 // attempt to connect to Wifi network:
 while (status != WL_CONNECTED) {
 Serial.print("Attempting to connect to SSID: ");
 Serial.println(ssid);
 // Connect to WPA/WPA2 network. Change this line if using open or WEP network:
 status = WiFi.begin(ssid, pass);
 // wait 10 seconds for connection:
 delay(10);
 }
 // you're connected now, so print out the status:
 printWifiStatus();
}
void printWifiStatus() {
 // print the SSID of the network you're attached to:
 Serial.print("SSID: ");
 Serial.println(WiFi.SSID());
 // print your board'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");
}

I had to rewrite my wifi connection into a function outside my setup. Because the program only established a connection in the beginning and closed it after my first request. By giving it it's own function I could call it inside my loop whenever the user would enter a code the program could reestablish a connection. My program now runs how I need it to run.

Answer 2

Although I can not verify my code, I tried to modify your program. Probably it does not compile and you have to do some corrections. I changed it in a way I would expect it to work and hopefully I understood your intentions.

At least we could use this version as a base to elaborate a working one together.

#include <Key.h>
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <Servo.h>
#include <SPI.h>
#include <WiFiNINA.h>
#include <ArduinoJson.h>
#define HIGH 0x1
#define LOW 0x0
char ssid[] = "ssid";
char pass[] = "password";
int keyIndex = 0;
int status = WL_IDLE_STATUS;
char server[] = "parcelbox.1819.caro.deweze.nxtmediatech.eu";
WiFiClient client;
LiquidCrystal_I2C lcd(0x27, 16, 2);
Servo myservo;
/* Keypad*/
const byte ROWS = 4;
const byte COLS = 3;
char keys[ROWS][COLS] = {
 {'1', '2', '3'},
 {'4', '5', '6'},
 {'7', '8', '9'},
 {'*', '0', '#'}
};
byte rowPins[ROWS] = {3, 4, 5, 6};
byte colPins[COLS] = {9, 8, 7};
Keypad customKeypad = Keypad(makeKeymap(keys), rowPins, colPins, ROWS, COLS);
String value = "";
void setup() 
{
 lcd.begin();
 Serial.begin(9600);
 myservo.attach(A0);
 lcd.backlight();
 if (WiFi.status() == WL_NO_MODULE) 
 {
 Serial.println("Communication with WiFi module failed!");
 while (true);
 }
 String fv = WiFi.firmwareVersion();
 if (fv < "1.0.0") { Serial.println("Please upgrade the firmware"); }
 // 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();
}
void loop() 
{
 lcd.clear();
 lcd.print("Geef bestelcode");
 char customKey = customKeypad.getKey();
 value = value + String(customKey);
 lcd.setCursor(0, 1);
 lcd.print(value);
 if (customKey == '#') 
 {
 String response_Status = "";
 Serial.println("\nStarting connection to server...");
 if ( client.connect( server, 80 ) ) 
 {
 value.remove(16);
 Serial.println(value);
 Serial.println("connected to server");
 // Make a HTTP request:
 client.println("GET /api/boxes/1444/code/" + value + " HTTP/1.1");
 client.println("Host: parcelbox.1819.caro.deweze.nxtmediatech.eu");
 client.println("Connection: close");
 client.println();
 }
 StaticJsonBuffer<500> jsonBuffer;
 if ( client.connected() ) 
 {
 String response = "";
 bool begin = false;
 // I do not understand why you have to use || ! begin 
 // If the client has no content available, you can not read some
 // It doesn't matter if begin is true or false. 
 // Or am I missing something?
 while ( client.available() || ! begin ) 
 {
 char c = client.read();
 if ( c == '{' ) { begin = true; }
 if ( begin ) { response += (c); }
 if ( c == '"}' ) { break; }
 delay(1);
 }
 // Why do you parse the json text for a special 
 // attribute and then parse it again into a json object
 // where you can read this attribute?
 int start = response.indexOf("status\":\"") + 11;
 int end = start + 3;
 response_Status = response.substring(start, end);
// I commented this out because you do not use the root variable 
// in the following code
// JsonObject& root = jsonBuffer.parseObject(response);
// if (!root.success())
// {
// Serial.print("parseObject(");
// Serial.print(response);
// Serial.println(") failed");
// break;
// }
 Serial.println(response_Status);
 if (response_Status == "200") 
 {
 Serial.println("response state == 200");
 // First open the box
 // 0° means open
 myservo.write(0);
 delay(175);
 // Then inform the user how to close it
 lcd.clear();
 // I added the cursor positioning.
 // As far as I know clear does not reset the cursor.
 lcd.setCursor(0, 0);
 lcd.print("Box openend ,press");
 lcd.setCursor(0, 1);
 lcd.print(" * to close");
 // then check if the user wants to close it
 char key;
 do 
 {
 key = customKeypad.getKey();
 if (key == '*') 
 {
 // 90° means locked
 myservo.write(90);
 value = "";
 }
 }
 while( key != '*' );
 }
 else
 {
 // I replaced the else if by a simple if
 // as (response_Status != "200") is the else case
 // of (response_Status == "200")
 Serial.println("response state != 200");
 lcd.clear();
 // "set cursor" added
 lcd.setCursor(0, 0);
 lcd.print("wrong code or");
 lcd.setCursor(0, 1);
 lcd.print("already deliverd");
 delay(175);
 value = "";
 }
 // I change the while loop into an if block
 // so you don't need a break; here
 }
// Here you could enter a halt state without a reason.
// Even you won't expect to halt here.
// if (!client.connected()) 
// {
// Serial.println();
// Serial.println("disconnecting from server.");
// client.stop();
//
// // do nothing forevermore:
// while (true);
// }
 }
 if (customKey == '*') 
 {
 // 90° means locked
 myservo.write(90); 
 value = ""; 
 }
 // for optimal lcd screen view
 delay(175);
}
void printWifiStatus() 
{
 Serial.print("SSID: ");
 Serial.println(WiFi.SSID());
 IPAddress ip = WiFi.localIP();
 Serial.print("IP Address: ");
 Serial.println(ip);
 long rssi = WiFi.RSSI();
 Serial.print("signal strength (RSSI):");
 Serial.print(rssi);
 Serial.println(" dBm");
}

EDIT

This edit is related to the updated version of your program.

If you close the box with a key press you also stop the client with the last line.

Please remove the following line from the program.

// lock box and reset value
if (customKey == '*') 
{
 Serial.println("CLOSE BOX");
 myservo.write(90); 
 value = "";
 // remove this as you can not connect a stopped client
 // client.stop();
}

• imkeVr: I tried your code it builds perfectly, I could open the box and close it but the LCD keeps displaying " box open press * to close ". Your code is much more readable and structured than mine! I can learn alot from this
• Peter Paul Kiefer: Thank you for the reply and extending your question. By looking at my code I saw that I made a terrible mistake. Perhaps I've programed with JavaScript for too long now. In JS "" and '' is the same. In C/C++ Its something completely different. The line while( key != "*" ) is always true and the Loop is never left. I've corrected it in my answer. while( key != '*' ). Could you please change it in your program too and try that version.
• Peter Paul Kiefer: @imkeVr I just realize that, you use a complete different code now. And it would be better if I had looked into the output earlier.;-) I don't believe the the Server disturbed the client communication. I think you are simply not able to open a connection with a client that is stopped. I'll update the answer once more. ;-)
• imkeVr: I found the a way that works for my program. I scratched the wifi setup in the void setup en relocated it to its own function outside any loop or setup. This way I could call for the function and reestablish a connection inside my void loop itself. It now works like it should. Thank you for all the help I learned alot by doing this!
• Peter Paul Kiefer: @imkeVr It was a pleasure to work with you. I first wanted to propose what you have done now by yourself, but I didn't want to make my answer too complicated. And now I see you managed it, just with the few information i gave you. This is one of the moments, that keeps me answering questions on SE. And I could imagine that, if you keep on learning quickly, our conversation in the future would be with changed rolls. I ask and you answer. I wish you and your partner success with the project.