initial buildroot for linux 5.15

package/tcping/Config.in

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+config BR2_PACKAGE_TCPING
+	bool "tcping"
+	help
+	  tcping does a TCP connect to the given ip/port
+	  combination. The user can specify a timeout in seconds. This
+	  is useful in shell scripts running in firewalled
+	  environments. Often SYNs are just being dropped by
+	  firewalls, thus connection establishment will be retried
+	  several times (for minutes) until a TCP timeout is
+	  reached. With tcping it is possible to check first if the
+	  desired port is reachable and then start connection
+	  establishment.
+
+	  https://github.com/mkirchner/tcping

package/tcping/tcping.hash

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+# Locally calculated
+sha256	a731f0e48ff931d7b2a0e896e4db40867043740fe901dd225780f2164fdbdcf3	tcping-1.3.6.tar.gz
+sha256	4a35620e27ddb8de27898e4206c8f93633d877c1e128e98e95a035f760d94428	LICENSE

package/tcping/tcping.mk

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+################################################################################
+#
+# tcping
+#
+################################################################################
+
+TCPING_VERSION = 1.3.6
+TCPING_SITE = $(call github,mkirchner,tcping,$(TCPING_VERSION))
+TCPING_LICENSE = MIT
+TCPING_LICENSE_FILES = LICENSE
+
+define TCPING_BUILD_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) CC="$(TARGET_CC)" CCFLAGS="$(TARGET_CFLAGS) $(TARGET_LDFLAGS)" \
+		-C $(@D) tcping.linux
+endef
+
+define TCPING_INSTALL_TARGET_CMDS
+	$(INSTALL) -D -m 0755 $(@D)/tcping $(TARGET_DIR)/usr/bin/tcping
+endef
+
+$(eval $(generic-package))