crontab doesn't run script

If crontab doesn't run a script and if the output is redirected to a zero length file, it may be because it is missing the #!/bin/bash or #!/bin/sh directive.

Another reason may be that the path is required.
change dotnet to /opt/dotnet/dotnet

Remember that crontab runs under a reduced environment. It may not have the necessary environment variables. For example echo @DOTNET_ROOT is empty when running as crontab. If you run it as su it returns /opt/dotnet

Consider the user you are running the crontab under. Does it need to be su?

In the end another approach was required: execute bash to run the script. This is the full crontab:

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# Added dotnet to the path   MAILTO=""   PATH=/usr/bin:/bin:/opt/dotnet:/usr/local/sbin:/usr/local/bin:/usr/sbin:/sbin   SHELL=/bin/bash     # It is necessary to execute bash in order to access the environment variables required for dotnet   * */12 * * * bash -l -c '/home/pi/SmartHome/easy-weatherstation/scripts/publishreadings.sh' > /home/pi/SmartHome/easy-weatherstation/scripts/logs/publishreadings.log 2>&1     */30 * * * * bash -l -c '/home/pi/SmartHome/easy-weatherstation/scripts/onereading.sh' > /home/pi/SmartHome/easy-weatherstation/scripts/logs/onereading.log 2>&1