readFrom method
Creates a payload from the specified header stream.
Implementation
@override
void readFrom(MqttByteBuffer payloadStream) {
var payloadBytesRead = 0;
final payloadLength = header!.messageSize - variableHeader!.length;
// Read the qos grants from the message payload
while (payloadBytesRead < payloadLength) {
final granted = MqttUtilities.getQosLevel(payloadStream.readByte());
payloadBytesRead++;
addGrant(granted);
}
}