do not exit dhcp if lease obtain failed

Author: romansavrulin

board/opencs18/v1/busybox.config

@@ -1,7 +1,7 @@
 #
 # Automatically generated make config: don't edit
 # Busybox version: 1.31.1
-# Wed Jan  8 08:05:13 2020
+# Wed Jan  8 08:37:15 2020
 #
 CONFIG_HAVE_DOT_CONFIG=y
 
@@ -837,9 +837,9 @@ CONFIG_WATCHDOG=y
 #
 # Networking Utilities
 #
-CONFIG_FEATURE_IPV6=y
+# CONFIG_FEATURE_IPV6 is not set
 # CONFIG_FEATURE_UNIX_LOCAL is not set
-CONFIG_FEATURE_PREFER_IPV4_ADDRESS=y
+# CONFIG_FEATURE_PREFER_IPV4_ADDRESS is not set
 # CONFIG_VERBOSE_RESOLUTION_ERRORS is not set
 # CONFIG_FEATURE_TLS_SHA1 is not set
 CONFIG_ARP=y
@@ -877,15 +877,15 @@ CONFIG_FEATURE_IFCONFIG_MEMSTART_IOADDR_IRQ=y
 CONFIG_FEATURE_IFCONFIG_HW=y
 # CONFIG_FEATURE_IFCONFIG_BROADCAST_PLUS is not set
 # CONFIG_IFENSLAVE is not set
-# CONFIG_IFPLUGD is not set
+CONFIG_IFPLUGD=y
 CONFIG_IFUP=y
 CONFIG_IFDOWN=y
 CONFIG_IFUPDOWN_IFSTATE_PATH="/var/run/ifstate"
 CONFIG_FEATURE_IFUPDOWN_IP=y
 CONFIG_FEATURE_IFUPDOWN_IPV4=y
-CONFIG_FEATURE_IFUPDOWN_IPV6=y
+# CONFIG_FEATURE_IFUPDOWN_IPV6 is not set
 CONFIG_FEATURE_IFUPDOWN_MAPPING=y
-# CONFIG_FEATURE_IFUPDOWN_EXTERNAL_DHCP is not set
+CONFIG_FEATURE_IFUPDOWN_EXTERNAL_DHCP=y
 CONFIG_INETD=y
 CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_ECHO=y
 CONFIG_FEATURE_INETD_SUPPORT_BUILTIN_DISCARD=y
@@ -941,10 +941,10 @@ CONFIG_TC=y
 CONFIG_FEATURE_TC_INGRESS=y
 # CONFIG_TCPSVD is not set
 # CONFIG_UDPSVD is not set
-CONFIG_TELNET=y
-CONFIG_FEATURE_TELNET_TTYPE=y
-CONFIG_FEATURE_TELNET_AUTOLOGIN=y
-CONFIG_FEATURE_TELNET_WIDTH=y
+# CONFIG_TELNET is not set
+# CONFIG_FEATURE_TELNET_TTYPE is not set
+# CONFIG_FEATURE_TELNET_AUTOLOGIN is not set
+# CONFIG_FEATURE_TELNET_WIDTH is not set
 # CONFIG_TELNETD is not set
 # CONFIG_FEATURE_TELNETD_STANDALONE is not set
 # CONFIG_FEATURE_TELNETD_INETD_WAIT is not set
@@ -997,7 +997,7 @@ CONFIG_UDHCP_DEBUG=0
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
 CONFIG_FEATURE_UDHCP_RFC3397=y
 CONFIG_FEATURE_UDHCP_8021Q=y
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n -O search"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b -O search"
 
 #
 # Print Utilities