./mqtt-tracker: Permission Denied Error and Solutions

The error message 'Permission denied' indicates that the current user does not have the necessary permissions to execute the file 'mqtt-tracker'.

To fix this issue, you can try the following:

1. Check the file permissions: Run the command ls -l mqtt-tracker to see the file permissions. Make sure that the file has the execute permission for the current user. If not, you can give the execute permission by running chmod +x mqtt-tracker.

2. Run the file as root: If you have the necessary permissions, you can try running the file as the root user by prefixing the command with sudo. For example, sudo ./mqtt-tracker.

3. Check if the file is located on a mounted filesystem: If the file is located on a mounted filesystem, make sure that the filesystem is not mounted with the 'noexec' option. If it is, you will need to remount the filesystem without the 'noexec' option.

If none of the above solutions work, there might be other factors involved, such as SELinux restrictions or file ownership. In such cases, you may need to investigate further or seek assistance from the system administrator.