'Pull updates from this repository
@param task: the task Row
@param onconflict: synchronization conflict resolver
@return: tuple (error, mtime), with error=None if successful,
else error=message, and mtime=modification timestamp
of the youngest record received'

def pull(self, task, onconflict=None):

    error = 'CommandBridge    API    pull    not    implemented'
    current.log.error(error)
    return (error, None)
