examples/wifi: add unified example for tcpclient that compiles for all supported wifi adaptors

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

examples/wifi/tcpclient/main.go

@@ -0,0 +1,111 @@
+// This example opens a TCP connection and sends some data,
+// for the purpose of testing speed and connectivity.
+//
+// You can open a server to accept connections from this program using:
+//
+// nc -w 5 -lk 8080
+//
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"time"
+
+	"tinygo.org/x/drivers/net"
+)
+
+// access point info
+const ssid = ""
+const pass = ""
+
+// IP address of the server aka "hub". Replace with your own info.
+const serverIP = ""
+
+var buf = &bytes.Buffer{}
+
+func main() {
+	initAdaptor()
+
+	connectToAP()
+
+	for {
+		sendBatch()
+		time.Sleep(500 * time.Millisecond)
+	}
+	println("Done.")
+}
+
+func sendBatch() {
+
+	// make TCP connection
+	ip := net.ParseIP(serverIP)
+	raddr := &net.TCPAddr{IP: ip, Port: 8080}
+	laddr := &net.TCPAddr{Port: 8080}
+
+	message("---------------\r\nDialing TCP connection")
+	conn, err := net.DialTCP("tcp", laddr, raddr)
+	for ; err != nil; conn, err = net.DialTCP("tcp", laddr, raddr) {
+		message(err.Error())
+		time.Sleep(5 * time.Second)
+	}
+
+	n := 0
+	w := 0
+	start := time.Now()
+
+	// send data
+	message("Sending data")
+
+	for i := 0; i < 1000; i++ {
+		buf.Reset()
+		fmt.Fprint(buf,
+			"\r---------------------------- i == ", i, " ----------------------------"+
+				"\r---------------------------- i == ", i, " ----------------------------")
+		if w, err = conn.Write(buf.Bytes()); err != nil {
+			println("error:", err.Error(), "\r")
+			continue
+		}
+		n += w
+	}
+
+	buf.Reset()
+	ms := time.Now().Sub(start).Milliseconds()
+	fmt.Fprint(buf, "\nWrote ", n, " bytes in ", ms, " ms\r\n")
+	message(buf.String())
+
+	if _, err := conn.Write(buf.Bytes()); err != nil {
+		println("error:", err.Error(), "\r")
+	}
+
+	// Right now this code is never reached. Need a way to trigger it...
+	println("Disconnecting TCP...")
+	conn.Close()
+}
+
+// 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)
+		}
+	}
+
+	println("Connected.")
+
+	time.Sleep(2 * time.Second)
+	ip, err := adaptor.GetClientIP()
+	for ; err != nil; ip, err = adaptor.GetClientIP() {
+		message(err.Error())
+		time.Sleep(1 * time.Second)
+	}
+	message(ip)
+}
+
+func message(msg string) {
+	println(msg, "\r")
+}