question: handle read command `` at+foo ? '' . read commands are part of the extended command syntax , and are typically used to read the value of `` foo '' . concode_field_sep PlaceHolder placeHolder concode_field_sep AtCommandResult handleSetCommand concode_elem_sep AtCommandResult handleActionCommand concode_elem_sep AtCommandResult handleTestCommand concode_elem_sep AtCommandResult handleBasicCommand
target: AtCommandResult function ( ) { return new AtCommandResult ( AtCommandResult . ERROR ) ; }