callGetMetadataCommand   
  suspend fun callGetMetadataCommand(endpoint: String, params: GetMetadataParams): GetMetadataResponse
Call camera._getMetadata
Return
response of _getMetadata command
Parameters
endpoint
Endpoint of Theta web API
params
fileUrl to get metadata parameters
See also
Throws
java.net.ConnectException   
can not connect to target endpoint
ConnectTimeoutException  
timeout to connect target endpoint
RedirectResponseException  
target response 3xx status
ClientRequestException  
target response 4xx status
ServerResponseException  
target response 5xx status