It looks like the file does not exist. You showed the output of % ps aux | grep indiserver as
nafa 704 0.0 0.0 1836 1364 ? Ss févr.11 0:14 /usr/bin/indiserver -v indi_weatherradio >> /tmp/weatherradio_output.txt
$ sudo ls -l /tmp
$ ps aux | grep indiserver
$ sudo killall indiserver
$ indiserver -v indi_weatherradio > ~/logfile.txt