Make TLS work over WiFiNINA

Verified on Arduino Nano33 IoT and nina fw v1.4.5

examples/wifinina/webclient/main.go

@@ -41,8 +41,7 @@ var buf [256]byte
 var lastRequestTime time.Time
 var conn net.Conn
 
-func main() {
-
+func setup() {
 	uart.Configure(machine.UARTConfig{TX: tx, RX: rx})
 
 	// Configure SPI for 8Mhz, Mode 0, MSB First
@@ -59,16 +58,33 @@ func main() {
 		machine.NINA_GPIO0,
 		machine.NINA_RESETN)
 	adaptor.Configure()
+}
+
+func main() {
+
+	setup()
+
+	waitSerial()
 
 	connectToAP()
 
 	for {
-		loop()
+		readConnection()
+		if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
+			makeHTTPRequest()
+		}
 	}
-	println("Done.")
+
 }
 
-func loop() {
+// Wait for user to open serial console
+func waitSerial() {
+	for !machine.UART0.DTR() {
+		time.Sleep(100 * time.Millisecond)
+	}
+}
+
+func readConnection() {
 	if conn != nil {
 		for n, err := conn.Read(buf[:]); n > 0; n, err = conn.Read(buf[:]) {
 			if err != nil {
@@ -78,9 +94,6 @@ func loop() {
 			}
 		}
 	}
-	if time.Now().Sub(lastRequestTime).Milliseconds() >= 10000 {
-		makeHTTPRequest()
-	}
 }
 
 func makeHTTPRequest() {
@@ -98,7 +111,7 @@ func makeHTTPRequest() {
 	message("\r\n---------------\r\nDialing TCP connection")
 	conn, err = net.DialTCP("tcp", laddr, raddr)
 	for ; err != nil; conn, err = net.DialTCP("tcp", laddr, raddr) {
-		message("connection failed: " + err.Error())
+		message("Connection failed: " + err.Error())
 		time.Sleep(5 * time.Second)
 	}
 	println("Connected!\r")
@@ -106,7 +119,7 @@ func makeHTTPRequest() {
 	print("Sending HTTP request...")
 	fmt.Fprintln(conn, "GET / HTTP/1.1")
 	fmt.Fprintln(conn, "Host:", server)
-	fmt.Fprintln(conn, "User-Agent: TinyGo/0.10.0")
+	fmt.Fprintln(conn, "User-Agent: TinyGo")
 	fmt.Fprintln(conn, "Connection: close")
 	fmt.Fprintln(conn)
 	println("Sent!\r\n\r")
@@ -114,19 +127,14 @@ func makeHTTPRequest() {
 	lastRequestTime = time.Now()
 }
 
-func readLine(conn *net.TCPSerialConn) string {
-	println("Attempting to read...\r")
-	b := buf[:]
-	for expiry := time.Now().Unix() + 10; time.Now().Unix() > expiry; {
-		if n, err := conn.Read(b); n > 0 && err == nil {
-			return string(b[0:n])
-		}
-	}
-	return ""
-}
-
 // connect to access point
 func connectToAP() {
+	if len(ssid) == 0 || len(pass) == 0 {
+		for {
+			println("Connection failed: Either ssid or password not set")
+			time.Sleep(10 * time.Second)
+		}
+	}
 	time.Sleep(2 * time.Second)
 	message("Connecting to " + ssid)
 	adaptor.SetPassphrase(ssid, pass)