getContentType abstract method

String? getContentType(
  1. Mapping content, [
  2. String? defaultValue
])

Extracts the content type from a raw content map.

Retrieves the message type identifier (e.g., "01" for text, "88" for command) from a raw content map with a fallback default value if the type field is missing.

@param content - Raw content map containing type metadata

@param defaultValue - Fallback value if type is not found

@return Extracted content type (or defaultValue if not present)

Implementation

String? getContentType(Mapping content, [String? defaultValue]);