UDP Warning - Unable to Read All Data
These remedies apply to the case when you receive some data and you get this warning message:
'udp' unable to read all requested data
ASCII Data
When using the UDP interface for:
Reading ASCII (text) data using the
fscanf
,fgets
, orfgetl
functions
these are possible causes and remedies:
Cause | Solution |
---|---|
An incorrect read terminator was used. | Verify that the Terminator property is set to the
value required by your device. |
Communication with the device was interrupted. | Check your device connection. For more information about troubleshooting configuration and connection, see Troubleshooting UDP Interface. |
Binary Data
When using the UDP interface for:
Reading binary data using the
fread
function
these are possible causes and remedies:
Cause | Solution |
---|---|
The number of values to read was not specified and was set to the
InputBufferSize by default. | Set the number of values to read using the size
argument on the fread function, or change the
InputBufferSize property. For information about
setting number of values to read, see fread . |
Device did not send all the requested data. | Check your device connection. For more information about troubleshooting configuration and connection, see Troubleshooting UDP Interface. |
There was a data format mismatch. | Verify that the device data format matches the specified read format.
Data format is set using the Precision property. For
more information about supported precisions, see fread . |
If the amount of data being received spans multiple UDP packets, it is possible that the system dropped packets. | The UDP packet size is controlled by the
OutputDatagramPacketSize property. You can
specify the size, in bytes, between 1 and 65,535, and the default value
is 512. You can increase or decrease the packet size if
necessary. |
Binblock Data
When using the UDP interface for:
Reading binblock (binary-block) data using the
binblockread
function
these are possible causes and remedies:
Cause | Solution |
---|---|
The timeout value might be too short for the amount of data being read. | Increase the Timeout property value. |
Communication with the device was interrupted. | Check your device connection. For more information about troubleshooting configuration and connection, see Troubleshooting UDP Interface. |
More Troubleshooting Help
For more information about troubleshooting the UDP interface, including supported platforms, adaptor requirements, configuration and connection, and other troubleshooting tips, see Troubleshooting UDP Interface.