manage http timeout to allow long poll

http.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"io"
 	"net/http"
+	"time"
 )
 
 func HttpGetId(url string) (response map[string]string, err error) {
@@ -25,8 +26,11 @@ func HttpGetId(url string) (response map[string]string, err error) {
 	return srvId, nil
 }
 
-func HttpPostMessage(url string, msg []byte) (response []byte, err error) {
-	resp, err := http.Post(url+"/msg",
+func HttpPostMessage(url string, msg []byte, timeout int) (response []byte, err error) {
+	client := http.Client{
+		Timeout: time.Duration(timeout) * time.Second,
+	}
+	resp, err := client.Post(url+"/msg",
 		"application/octet-stream", bytes.NewBuffer(msg))
 	if err != nil {
 		return nil, err