class ProxyNotOwnedException(Exception):
    """Should not occur in correct operation. For whatever reason, this means the proxy was invalidated."""
    pass


class DeviceAccessError(Exception):
    """General error indicating that HW access failed."""
    pass


class DeviceBusy(DeviceAccessError):
    """Error thrown when the HW proxy (i.e. access) cannot be acquired"""
    pass


class MagFieldOutOfBounds(Exception):
    """Set magnetic field must be a positive number between 0 and 200µT!"""
    pass