rtl8720dn: add examples/rtl8720dn/mqtt*

rtl8720dn/netdriver.go

@@ -266,8 +266,15 @@ func (r *RTL8720DN) IsSocketDataAvailable() bool {
 	if r.debug {
 		fmt.Printf("IsSocketDataAvailable()\r\n")
 	}
-	fmt.Printf("not implemented yet\r\n")
-	return true
+	ret, err := r.Rpc_lwip_available(r.socket)
+	if err != nil {
+		fmt.Printf("error: %s\r\n", err.Error())
+		return false
+	}
+	if ret == 1 {
+		return true
+	}
+	return false
 }
 
 func (r *RTL8720DN) Response(timeout int) ([]byte, error) {

rtl8720dn/rpc_util.go

@@ -3,7 +3,6 @@ package rtl8720dn
 import (
 	"fmt"
 	"io"
-	"time"
 )
 
 var (
@@ -66,7 +65,7 @@ func dumpHex(b []byte) {
 	}
 }
 
-func (r *RTL8720DN) readThread() {
+func (r *RTL8720DN) read() {
 	for {
 		n, _ := io.ReadFull(r.port, readBuf[:4])
 		if n == 0 {
@@ -93,13 +92,10 @@ func (r *RTL8720DN) readThread() {
 
 		crcNew := computeCRC16(payload[:n])
 		if g, e := crcNew, crc; g != e {
-			fmt.Printf("err CRC16: got %04X want %04X\n", g, e)
+			fmt.Printf("err CRC16: got %04X want %04X\r\n", g, e)
 		}
 		if payload[0] == 0x02 || payload[0] == 0x00 {
-			r.received <- true
-
-			// switch goroutine
-			time.Sleep(1)
+			return
 		}
 	}
 }

rtl8720dn/rtl8720dn.go

@@ -3,10 +3,10 @@ package rtl8720dn
 import "io"
 
 type RTL8720DN struct {
-	port     io.ReadWriter
-	seq      uint64
-	received chan bool
-	debug    bool
+	port  io.ReadWriter
+	seq   uint64
+	sema  chan bool
+	debug bool
 
 	connectionType ConnectionType
 	socket         int32
@@ -26,14 +26,12 @@ const (
 
 func New(r io.ReadWriter) *RTL8720DN {
 	ret := &RTL8720DN{
-		port:     r,
-		seq:      1,
-		received: make(chan bool, 1),
-		debug:    false,
+		port:  r,
+		seq:   1,
+		sema:  make(chan bool, 1),
+		debug: false,
 	}
 
-	go ret.readThread()
-
 	return ret
 }