busybox: Make sure we keep re-trying to obtain a lease

CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS was set to '-n' which means
"Exit with failure if lease cannot be immediately negotiated."

What we'd rather want is for udhcpc to continue to run until a lease can
finally obtain.  Otherwise we have a race condition in case the DHCP
server is not reachable for a few seconds during system boot, and end up
having a system that is permanently without an IP address.

This fixes ORT#639

recipes-core/busybox/busybox-1.21.1/defconfig

@@ -854,7 +854,7 @@ CONFIG_UDHCP_DEBUG=0
 # CONFIG_FEATURE_UDHCP_8021Q is not set
 CONFIG_UDHCPC_DEFAULT_SCRIPT="/usr/share/udhcpc/default.script"
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b"
 # CONFIG_UDPSVD is not set
 # CONFIG_VCONFIG is not set
 CONFIG_WGET=y

recipes-core/busybox/busybox-1.22.1/defconfig

@@ -854,7 +854,7 @@ CONFIG_UDHCP_DEBUG=0
 # CONFIG_FEATURE_UDHCP_8021Q is not set
 CONFIG_UDHCPC_DEFAULT_SCRIPT="/usr/share/udhcpc/default.script"
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b"
 # CONFIG_UDPSVD is not set
 # CONFIG_VCONFIG is not set
 CONFIG_WGET=y

recipes-core/busybox/busybox_sysmocom.inc

@@ -1,6 +1,6 @@
 SYSMOCOM := "${@os.path.dirname(bb.data.getVar('FILE', d, True))}"
 FILESEXTRAPATHS_prepend := "${SYSMOCOM}/busybox-${SYSMOCOM_ORIG_PV}:${SYSMOCOM}/files:"
-PRINC = "21"
+PRINC = "22"
 
 SRC_URI += "file://busybox-ifplugd.sh \
             file://ifplugd.sh"

recipes-core/busybox/files/defconfig

@@ -776,7 +776,7 @@ CONFIG_UDHCP_DEBUG=0
 # CONFIG_FEATURE_UDHCP_RFC3397 is not set
 CONFIG_UDHCPC_DEFAULT_SCRIPT="/usr/share/udhcpc/default.script"
 CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS=80
-CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -n"
+CONFIG_IFUPDOWN_UDHCPC_CMD_OPTIONS="-R -b"
 # CONFIG_VCONFIG is not set
 CONFIG_WGET=y
 CONFIG_FEATURE_WGET_STATUSBAR=y