Merge pull request #108 from Lawlieta/chenyong

修改日志显示错误，修改 ESP8266 解析 DHCP 状态入参类型错误

class/esp8266/at_device_esp8266.c

@@ -57,7 +57,7 @@ static void esp8266_get_netdev_info(struct rt_work *work, void *work_data)
     ip_addr_t ip_addr;
     rt_uint32_t mac_addr[6] = {0};
     rt_uint32_t num = 0;
-    rt_uint8_t dhcp_stat = 0;
+    rt_uint32_t dhcp_stat = 0;
     struct rt_delayed_work *delay_work = (struct rt_delayed_work *)work;
     struct at_device *device = (struct at_device *)work_data;
     struct netdev *netdev = device->netdev;

class/sim76xx/at_device_sim76xx.c

@@ -529,7 +529,7 @@ static void sim76xx_init_thread_entry(void *parameter)
             at_obj_exec_cmd(client, resp, "AT+CPIN?");
             if (at_resp_get_line_by_kw(resp, "READY"))
             {
-                LOG_D("%s device SIM card detection failed.", device->name);
+                LOG_D("%s device SIM card detection success.", device->name);
                 break;
             }
             LOG_I("\"AT+CPIN\" commands send retry...");