other: improve login

Signed-off-by: Jianhui Zhao <[email protected]>

broker.go

@@ -1,8 +1,9 @@
 package main
 
 import (
-	"encoding/binary"
 	"crypto/x509"
+	"encoding/binary"
+	"time"
 
 	"github.com/gorilla/websocket"
 	jsoniter "github.com/json-iterator/go"
@@ -83,8 +84,10 @@ func (br *broker) run() {
 			} else {
 				if dev, ok := br.devices[devid]; ok {
 					if _, ok := br.waitLoginUsers[devid]; ok {
-						userLoginAck(loginErrorBusy, c)
-						log.Error().Msg("login fail, device busy")
+						log.Error().Msg("Another user is logining the device, wait...")
+						time.AfterFunc(time.Millisecond*10, func() {
+							br.register <- c
+						})
 					} else {
 						br.waitLoginUsers[devid] = c
 						dev.WriteMsg(msgTypeLogin, []byte{})