cccs: switch daemon init method to inittab for sysvinit-based systems

This commit updates the CCCS recipe to support `inittab`-based daemon
initialization for platforms using `sysvinit`, such as ConnectCore 6UL.

By switching to `inittab` for daemon control in these systems, we guarantee
automatic relaunch of `cccsd` if it exits unexpectedly (this functionality was
previously only available with `systemd`)

This improves reliability and aligns behavior across `systemd` and non-`systemd`
platforms.

See Confluence question
"Why won't CC6-UL rejoin DRM after a planned DRM outage?"
(https://onedigi.atlassian.net/wiki/plugins/servlet/ac/com.atlassian.confluence.plugins.confluence-questions/globalQuestionsViewer?ac.com.atlassian.confluence.plugins.confluence-questions.path=/questions/236710985798)

Signed-off-by: Tatiana Leon <Tatiana.Leon@digi.com>
(cherry picked from commit 5c667641a88437795fea3097ca5cf76c22de47c1)

meta-digi-dey/recipes-digi/cccs/cccs_git.bb

@@ -22,6 +22,7 @@ SRC_URI = " \
     ${CC_GIT_URI};branch=${SRCBRANCH} \
     file://cccsd-init \
     file://cccsd.service \
+    file://cccsd.tab \
     file://cccs-gs-demo-init \
     file://cccs-gs-demo.service \
 "
@@ -50,16 +51,21 @@ inherit pkgconfig systemd update-rc.d
 do_install() {
 	oe_runmake DESTDIR=${D} install
 
+	install -d ${D}${sysconfdir}/init.d/
+
 	if ${@bb.utils.contains('DISTRO_FEATURES', 'systemd', 'true', 'false', d)}; then
 		# Install systemd unit files
 		install -d ${D}${systemd_unitdir}/system
 		install -m 0644 ${WORKDIR}/cccsd.service ${D}${systemd_unitdir}/system/
 		install -m 0644 ${WORKDIR}/cccs-gs-demo.service ${D}${systemd_unitdir}/system/
-	fi
 
-	install -d ${D}${sysconfdir}/init.d/
 		install -m 755 ${WORKDIR}/cccsd-init ${D}${sysconfdir}/cccsd
 		ln -sf /etc/cccsd ${D}${sysconfdir}/init.d/cccsd
+	else
+		install -d ${D}${sysconfdir}/inittab.d/
+		install -m 755 ${WORKDIR}/cccsd.tab ${D}${sysconfdir}/inittab.d/cccsd.tab
+	fi
+
 	install -m 755 ${WORKDIR}/cccs-gs-demo-init ${D}${sysconfdir}/cccs-gs-demo
 	ln -sf /etc/cccs-gs-demo ${D}${sysconfdir}/init.d/cccs-gs-demo
 
@@ -100,9 +106,7 @@ REMOVE_POSTINST_RPN = "${PN}-daemon"
 inherit ${@bb.utils.contains("IMAGE_FEATURES", "read-only-rootfs", "remove-pkg-postinst-ontarget", \
            oe.utils.ifelse(d.getVar("CCCS_CONF_PATH"), "remove-pkg-postinst-ontarget", ""), d)}
 
-INITSCRIPT_PACKAGES = "${PN}-daemon ${PN}-gs-demo"
-INITSCRIPT_NAME:${PN}-daemon = "cccsd"
-INITSCRIPT_PARAMS:${PN}-daemon = "defaults 19 81"
+INITSCRIPT_PACKAGES = "${PN}-gs-demo"
 INITSCRIPT_NAME:${PN}-gs-demo = "cccs-gs-demo"
 INITSCRIPT_PARAMS:${PN}-gs-demo = "defaults 81 19"
 
@@ -127,6 +131,7 @@ FILES:${PN}-daemon = " \
     ${sysconfdir}/cccsd \
     ${sysconfdir}/cccs.conf \
     ${sysconfdir}/init.d/cccsd \
+    ${sysconfdir}/inittab/cccsd.tab \
 "
 
 FILES:${PN}-gs-demo = " \

meta-digi-dey/recipes-digi/cccs/files/cccsd.tab

@@ -0,0 +1 @@
+cccs:2345:respawn:/usr/bin/cccsd -d > /dev/null 2>&1