espat: refactor net and tls interface compatible code into separate sub-packages

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

espat/tls/tls.go

@@ -0,0 +1,39 @@
+// Package tls is intended to provide a minimal set of compatible interfaces with the
+// Go standard library's tls package.
+package tls
+
+import (
+	"strconv"
+
+	"tinygo.org/x/drivers/espat"
+	"tinygo.org/x/drivers/espat/net"
+)
+
+// Dial makes a TLS network connection. It tries to provide a mostly compatible interface
+// to tls.Dial().
+// Dial connects to the given network address.
+func Dial(network, address string, config *Config) (*net.TCPSerialConn, error) {
+	raddr, err := net.ResolveTCPAddr(network, address)
+	if err != nil {
+		return nil, err
+	}
+
+	addr := raddr.IP.String()
+	sendport := strconv.Itoa(raddr.Port)
+
+	// disconnect any old socket
+	espat.ActiveDevice.DisconnectSocket()
+
+	// connect new socket
+	err = espat.ActiveDevice.ConnectSSLSocket(addr, sendport)
+	if err != nil {
+		return nil, err
+	}
+
+	return net.NewTCPSerialConn(net.SerialConn{Adaptor: espat.ActiveDevice}, nil, raddr), nil
+}
+
+// Config is a placeholder for future compatibility with
+// tls.Config.
+type Config struct {
+}