#!/bin/bash

CMD="./uart | tail -n +2"

IFS=$'\n'
SENSORS=( $(eval $CMD) )
#declare -p SENSORS

IFS=' '
for ROW in "${SENSORS[@]}"; do
    ENTRY=( $ROW )
    NODE=${ENTRY[0]}
    SENSOR=${ENTRY[1]}
    VALUE=${ENTRY[2]}
    TYPE=${ENTRY[3]}
    TTL=$(echo "${ENTRY[4]}" | tr -d '[:space:]')

    if [ "$TTL" != "0" ]; then
        echo "${NODE}_${SENSOR} ${VALUE}"
    fi
done