examples/wifinina: improve connectToAP() and other needed minor corrections

Signed-off-by: deadprogram <ron@hybridgroup.com>

examples/wifinina/mqttclient/main.go

@@ -65,6 +65,7 @@ func main() {
 	adaptor.Configure()
 
 	connectToAP()
+	displayIP()
 
 	opts := mqtt.NewClientOptions()
 	opts.AddBroker(server).SetClientID("tinygo-client-" + randomString(10))
@@ -101,26 +102,33 @@ func main() {
 	println("Done.")
 }
 
+const retriesBeforeFailure = 3
+
 // connect to access point
 func connectToAP() {
 	time.Sleep(2 * time.Second)
-	println("Connecting to " + ssid)
-	err := adaptor.ConnectToAccessPoint(ssid, pass, 10*time.Second)
-	if err != nil { // error connecting to AP
-		for {
-			println(err)
-			time.Sleep(1 * time.Second)
+	var err error
+	for i := 0; i < retriesBeforeFailure; i++ {
+		println("Connecting to " + ssid)
+		err = adaptor.ConnectToAccessPoint(ssid, pass, 10*time.Second)
+		if err == nil {
+			println("Connected.")
+
+			return
 		}
 	}
 
-	println("Connected.")
+	// error connecting to AP
+	failMessage(err.Error())
+}
 
+func displayIP() {
 	ip, _, _, err := adaptor.GetIP()
 	for ; err != nil; ip, _, _, err = adaptor.GetIP() {
 		println(err.Error())
 		time.Sleep(1 * time.Second)
 	}
-	println(ip.String())
+	println("IP address: " + ip.String())
 }
 
 // Returns an int >= min, < max