In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 3:

. /lib/rcscripts/sh/error.sh

  ^------------------------^ SC1091 (info): Not following: /lib/rcscripts/sh/error.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 4:

. /lib/rcscripts/sh/rc-std2parse.sh

  ^-- SC1091 (info): Not following: /lib/rcscripts/sh/rc-std2parse.sh was not specified as input (see shellcheck -x).

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 9:

	local mcast_video mcast_audio channel=0

        ^-- SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 10:

	local setter=/usr/sbin/mcast-always-setter

        ^----------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 21:

	while [ $channel -lt $STD2_NETWORK_RTP_NBROFRTPGROUPS ]; do

                             ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

	while [ $channel -lt "$STD2_NETWORK_RTP_NBROFRTPGROUPS" ]; do

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 23:

		[ "$mcast_video" != yes ] || $setter $1 $channel video || :

                                                     ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

		[ "$mcast_video" != yes ] || $setter "$1" $channel video || :

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 26:

		[ "$mcast_audio" != yes ] || $setter $1 $channel audio || :

                                                     ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

		[ "$mcast_audio" != yes ] || $setter "$1" $channel audio || :

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 28:

		channel=$(($channel + 1))

                           ^------^ SC2004 (style): $/${} is unnecessary on arithmetic variables.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 33:

	local mca_conf=/etc/dynamic/mcast-always.conf

        ^------------^ SC3043 (warning): In POSIX sh, 'local' is undefined.

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/libexec/mcast-always-setup line 46:

		loop_through_channels $1

                                      ^-- SC2086 (info): Double quote to prevent globbing and word splitting.

Did you mean: 

		loop_through_channels "$1"

For more information:

  https://www.shellcheck.net/wiki/SC3043 -- In POSIX sh, 'local' is undefined.

  https://www.shellcheck.net/wiki/SC1091 -- Not following: /lib/rcscripts/sh/...

  https://www.shellcheck.net/wiki/SC2086 -- Double quote to prevent globbing ...