Bug/serial read failure

configFiles/balancer.sh

@@ -4,7 +4,9 @@ tag="[BALANCER]"
 max_retries="10"
 
 echo "${tag} Started"
-ap_name="$(sh /home/kipr/wombat-os/flashFiles/wallaby_get_serial.sh)-wombat"
+serial="$(/home/kipr/wombat-os/flashFiles/wallaby_get_serial.sh)" || exit 1
+[ -n "$serial" ] || { echo "empty Wombat serial" >&2; exit 1; }
+ap_name="${serial}-wombat"
 
 cleanup() {
 	# Ensure wifi transmitter is turned back on

flashFiles/wallaby_get_serial.sh

@@ -1,17 +1,7 @@
-#!/bin/bash
-
-VCMD1='i2cget -y 1 0x50 0x40'
-VCMD2='i2cget -y 1 0x50 0x41'
-VCMD3='i2cget -y 1 0x50 0x42'
-VCMD4='i2cget -y 1 0x50 0x43'
-
-V1=$(eval $VCMD1)
-V2=$(eval $VCMD2)
-V3=$(eval $VCMD3)
-V4=$(eval $VCMD4)
-
-printf '%s' "\x$(printf %x ${V1})" | sed 's/^...//'
-printf '%s' "\x$(printf %x ${V2})" | sed 's/^...//'
-printf '%s' "\x$(printf %x ${V3})" | sed 's/^...//'
-printf '%s' "\x$(printf %x ${V4})" | sed 's/^...//'
+#!/usr/bin/env bash
+set -euo pipefail
 
+for reg in 0x40 0x41 0x42 0x43; do
+    v=$(i2cget -y 1 0x50 "$reg")
+    printf '%b' "\\x${v#0x}"
+done