def collectDiagnostics(self, diagZipFilename='ixiaDiagnostics.zip', localPath=None):
        """
        Description
           Collect diagnostics for debugging.
        
        Parameter
           diagZipFileName: <str>: The diagnostic filename to name with .zip extension.
           localPath: <str>: The local destination where you want to put the collected diag file.
        """
        if localPath is None:
            localPath = '.'

        url = self.ixnObj.sessionUrl+'/operations/collectlogs'
        data = {'arg1': self.ixnObj.headlessSessionId+'/'+diagZipFilename}
        response = self.ixnObj.post(url, data=data)
        self.ixnObj.waitForComplete(response, url+'/'+response.json()['id'], silentMode=False, timeout=900)
        response = self.ixnObj.get(self.ixnObj.sessionUrl+'/files')
        absolutePath = response.json()['absolute']

        if self.ixnObj.serverOs in ['windows', 'windowsConnectionMgr']:
            absolutePath = absolutePath.replace('/', '\\')
            self.copyFileWindowsToLocalLinux(windowsPathAndFileName=absolutePath+'\\'+diagZipFilename, localPath=localPath)

        if self.ixnObj.serverOs == 'linux':
            self.copyFileLinuxToLocalLinux(linuxApiServerPathAndFileName=absolutePath+'/'+diagZipFilename, localPath=localPath)