From 24adda3e0d6eb30b8e8283004f7cba9480c359b2 Mon Sep 17 00:00:00 2001
From: David Lin <linpeng1577@gmail.com>
Date: Fri, 31 Jul 2020 20:45:44 +0800
Subject: [PATCH] Update nb-iot_example.c

---
 examples/nb-iot_demo/nb-iot_example.c | 47 +++++++++++++++++----------
 1 file changed, 30 insertions(+), 17 deletions(-)

diff --git a/examples/nb-iot_demo/nb-iot_example.c b/examples/nb-iot_demo/nb-iot_example.c
index 616b34d4..df340753 100644
--- a/examples/nb-iot_demo/nb-iot_example.c
+++ b/examples/nb-iot_demo/nb-iot_example.c
@@ -5,6 +5,7 @@
 
 
 #define NB_IoT_TEST_TASK_STK_SIZE         1024
+
 void nb_iot_demo(void);
 osThreadDef(nb_iot_demo, osPriorityNormal, 1, NB_IoT_TEST_TASK_STK_SIZE);
 
@@ -15,30 +16,42 @@ uint8_t recv_data[RECV_LEN];
 void nb_iot_demo(void)
 {
     int recv_len = -1;
-    int bc35_28_95_sal_lwm2m_init(hal_uart_port_t uart_port);
+	
+    extern int bc35_28_95_sal_lwm2m_init(hal_uart_port_t uart_port);
     bc35_28_95_sal_lwm2m_init(HAL_UART_PORT_0);
+	
     socket_id = tos_sal_module_connect("49.4.85.232","5683",TOS_SAL_PROTO_UDP);
-    if(socket_id !=-1){
+    if(socket_id !=-1)
+    {
         printf("connect to cloud success! fd: %d\n", socket_id);	
     }
-	else{
+    else
+    {
         printf("connect to cloud failed!\n");
-	}
-	while (1) {
-		tos_sal_module_send(socket_id, (const void*)"22", strlen("22"));
+    }
 
-		recv_len = tos_sal_module_recv(socket_id, recv_data, sizeof(recv_data));
-		if (recv_len < 0) {
-			printf("task receive error\n");
-		} else if (recv_len == 0) {
-		    printf("task receive none\n");
-		} else {
-			recv_data[recv_len] = 0;
-			printf("task: receive len: %d\nmsg from remote: %s\n", recv_len, recv_data);
-		}
+    while (1) 
+    {
+        tos_sal_module_send(socket_id, (const void*)"22", strlen("22"));
 
-		tos_sleep_ms(2000);
-	}
+        memset(&recv_data[0], 0, sizeof(recv_data));
+        recv_len = tos_sal_module_recv(socket_id, recv_data, sizeof(recv_data));
+        if (recv_len < 0) 
+        {
+            printf("task receive error\n");
+        }
+        else if (recv_len == 0) 
+        {
+	    printf("task receive none\n");
+        } 
+        else 
+        {
+            recv_data[recv_len] = 0;
+            printf("task: receive len: %d\nmsg from remote: %s\n", recv_len, recv_data);
+        }
+
+        tos_sleep_ms(2000);
+    }
 }
 
 void application_entry(void *arg)