In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/heater_status.sh line 21:

while [ $i -lt $nbr_of_heaters ]; do

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

Did you mean: 

while [ $i -lt "$nbr_of_heaters" ]; do

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/heater_status.sh line 27:

	stat=$(echo $stat)

             ^-----------^ SC2116 (style): Useless echo? Instead of 'cmd $(echo foo)', just use 'cmd foo'.

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

Did you mean: 

	stat=$(echo "$stat")

In /logs/firmware/unblob_extracted/firmware_extract/4325012-58052244.squashfs_v4_le_extract/usr/bin/heater_status.sh line 35:

	i=$(($i + 1))

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

For more information:

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

  https://www.shellcheck.net/wiki/SC2004 -- $/${} is unnecessary on arithmeti...

  https://www.shellcheck.net/wiki/SC2116 -- Useless echo? Instead of 'cmd $(e...