Extracts the relevant information from the packet and stores it in an internal map.
Source
Channel.fromPacket(Packet packet) {
packet.contentAsMap.forEach((key, value) {
if (key.startsWith("variable_")) {
String keyNoPrefix = (key.split("variable_")[1]);
_variables[keyNoPrefix] = value;
} else if (!excludedFields.contains(key)) {
_fields[key] = value;
}
});
}