From f2d78e87b5130c75162f1ba43471306807960a1b Mon Sep 17 00:00:00 2001
From: wenxingpt <131738066+wenxingpt@users.noreply.github.com>
Date: Sun, 14 May 2023 12:33:59 +0800
Subject: [PATCH] [component][at] fix(misc): fix null char input issue

fix issue #7005
---
 components/net/at/src/at_server.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/net/at/src/at_server.c b/components/net/at/src/at_server.c
index f55891de11..c9f98ad39d 100644
--- a/components/net/at/src/at_server.c
+++ b/components/net/at/src/at_server.c
@@ -33,6 +33,7 @@
 #define AT_CMD_SEMICOLON               ';'
 #define AT_CMD_CR                      '\r'
 #define AT_CMD_LF                      '\n'
+#define AT_CMD_NULL                    '\0'
 
 static at_server_t at_server_local = RT_NULL;
 static at_cmd_t cmd_table = RT_NULL;
@@ -474,6 +475,10 @@ static void server_parser(at_server_t server)
 
                 continue;
             }
+            else if (ch == AT_CMD_NULL)
+            {
+                continue;
+            }
             else
             {
                 at_server_printf("%c", ch);