Examples: provisioning, add wifi version check and prompt retry for U…

…NO R4 WiFi

examples/utility/Provisioning/Provisioning.ino

@@ -12,6 +12,12 @@
 #include <WiFiNINA.h>
 #define LATEST_WIFI_FIRMWARE_VERSION WIFI_FIRMWARE_LATEST_VERSION
 #endif
+#if defined(ARDUINO_UNOR4_WIFI)
+#include <WiFiS3.h>
+#define LATEST_WIFI_FIRMWARE_VERSION WIFI_FIRMWARE_LATEST_VERSION
+#endif
+
+String promptAndReadLine(const char* prompt, const unsigned int timeout = 0);
 
 void setup() {
   Serial.begin(9600);
@@ -51,7 +57,7 @@ void setup() {
   }
 
   /* WARNING: This string is parsed from IoTCloud frontend */
-  String csrConfirm = promptAndReadLine("Would you like to generate a new private key and CSR (y/N): ");
+  String csrConfirm = promptAndReadLine("Would you like to generate a new private key and CSR (y/N): ", 5000);
   csrConfirm.toLowerCase();
 
   if (csrConfirm != "y") {
@@ -86,6 +92,7 @@ void setup() {
 
   Serial.println("Generated CSR is:");
   Serial.println();
+  /* WARNING: This string is parsed from IoTCloud frontend */
   Serial.println(csr);
 
   String issueYear              = promptAndReadLine("Please enter the issue year of the certificate (2000 - 2031): ");
@@ -111,6 +118,7 @@ void setup() {
   }
 
   if (!Certificate.begin()) {
+    /* WARNING: This string is parsed from IoTCloud frontend */
     Serial.println("Error starting crypto storage!");
     while (1);
   }
@@ -133,12 +141,13 @@ void setup() {
     Serial.println("Error building cert!");
     while (1);
   }
-  
+
   if (!SElementArduinoCloudCertificate::write(secureElement, Certificate, SElementArduinoCloudSlot::CompressedCertificate)) {
     Serial.println("Error storing cert!");
     while (1);
   }
 
+  /* WARNING: This string is parsed from IoTCloud frontend */
   Serial.println("Compressed cert = ");
 
   const byte* certData = Certificate.bytes();
@@ -193,18 +202,32 @@ void setup() {
 void loop() {
 }
 
-String promptAndReadLine(const char* prompt) {
-  Serial.print(prompt);
-  String s = readLine();
+String promptAndReadLine(const char* prompt, const unsigned int timeout) {
+  String s = "";
+  while(1) {
+    Serial.print(prompt);
+    s = readLine(timeout);
+    if (s.length() > 0) {
+      break;
+    }
+  }
   Serial.println(s);
 
   return s;
 }
 
-String readLine() {
-  String line;
+bool isExpired(const unsigned int start, const unsigned int timeout) {
+  if (timeout) {
+    return (millis() - start) > timeout;
+  } else {
+    return false;
+  }
+}
 
-  while (1) {
+String readLine(const unsigned int timeout) {
+  String line;
+  const unsigned int start = millis();
+  while (!isExpired(start, timeout)) {
     if (Serial.available()) {
       char c = Serial.read();