Using TCP Send Commands similar to Hyperterminal

Hey everyone,
I am making my first program that deals with wireless communication. I am having some issues in understanding how data is transmitted.
Here's what I am currently able to do. I can open hyperterminal, directly connect to my device using the IP Address and Port number. Once connected, I see my 'Hello' confirming that I am connected. After being connected, I can send out characters one by one using Hyperterminal. This is perfectly ok for testing, but I want to use LV to make a GUI so that I won't mix up what button commands what.
I have attached my VI and I feel like I'm doing something fundamentally wrong. When using Telnet, if I send a '1' I can see its value on the Rx port of my device using an oscilloscope. With my VI, I don't see anything from the oscilloscope until I stop it.
I think I am just missing something small. I really appreciate the help.
Thanks,
Seth
Attachments:
TCP Basic Read.vi ‏16 KB

Thank you for the quick feedback.
Here are the edits that I made. I am now seeing data from the oscilloscope, but it's not what I'm expecting. With how my code is set up, would it send whatever command is in the box every 50ms? Is the delay even necessary? I am really just trying to learn how to send a single character. Once I'm able to do that, I can take it from there.
Again, I really appreciate the help!
Attachments:
TCP Basic Read1.1.vi ‏14 KB

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Object (IN_USE): [Vnic] 0004fb0000070000cca7bba64be932d0 (00:21:f6:00:00:09)
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Object (IN_USE): [VmDiskMapping] 0004fb0000130000d15838ce48a895f1
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Object (IN_USE): [VirtualDisk] 0004fb0000120000efbd814b4b7c0e8d.img
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Class=InternalJobDbImpl vessel_id=1342 method=setFailedOperation accessLevel=6
Class=VmDiskMappingDbImpl vessel_id=1116 method=nextJobOperation accessLevel=6
Class=VnicDbImpl vessel_id=958 method=nextJobOperation accessLevel=6
Class=VirtualMachineDbImpl vessel_id=1085 method=nextJobOperation accessLevel=6
Class=BondPortDbImpl vessel_id=554 method=nextJobOperation accessLevel=6
Class=VmDiskMappingDbImpl vessel_id=1122 method=nextJobOperation accessLevel=6
Class=VirtualCdromDbImpl vessel_id=209 method=nextJobOperation accessLevel=6
Class=VirtualDiskDbImpl vessel_id=1107 method=nextJobOperation accessLevel=6
Class=VirtualMachineDbImpl vessel_id=1085 method=nextJobOperation accessLevel=6
Class=BondPortDbImpl vessel_id=554 method=nextJobOperation accessLevel=6
Completed Step: ROLLBACK
Job failed commit (internal) due to OVMAPI_4010E Attempt to send command: dispatch to server: myserver1.example.com failed. OVMAPI_4004E Server Failed Command: dispatch https://?uname?:[email protected]:8899/api/2 start_vm 0004fb00000300003907f6fd90ef0e08 0004fb00000600009526838f3d4be255, Status: org.apache.xmlrpc.XmlRpcException: exceptions.RuntimeError:Command: ['xm', 'create', '/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg'] failed (1): stderr: Error: HVM guest support is unavailable: is VT/AMD-V supported by your CPU and enabled in your BIOS?
stdout: Using config file "/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg".
Sun Jul 29 14:57:14 PDT 2012
Sun Jul 29 14:57:14 PDT 2012
com.oracle.ovm.mgr.api.exception.FailedOperationException: OVMAPI_4010E Attempt to send command: dispatch to server: myserver1.example.com failed. OVMAPI_4004E Server Failed Command: dispatch https://?uname?:[email protected]:8899/api/2 start_vm 0004fb00000300003907f6fd90ef0e08 0004fb00000600009526838f3d4be255, Status: org.apache.xmlrpc.XmlRpcException: exceptions.RuntimeError:Command: ['xm', 'create', '/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg'] failed (1): stderr: Error: HVM guest support is unavailable: is VT/AMD-V supported by your CPU and enabled in your BIOS?
stdout: Using config file "/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg".
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at com.oracle.ovm.mgr.api.job.InternalJobDbImpl.objectCommitter(InternalJobDbImpl.java:1140)
at sun.reflect.GeneratedMethodAccessor1084.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at com.oracle.odof.core.AbstractVessel.invokeMethod(AbstractVessel.java:329)
at com.oracle.odof.core.AbstractVessel.invokeMethod(AbstractVessel.java:289)
at com.oracle.odof.core.BasicWork.invokeMethod(BasicWork.java:136)
at com.oracle.odof.command.InvokeMethodCommand.process(InvokeMethodCommand.java:100)
at com.oracle.odof.core.BasicWork.processCommand(BasicWork.java:81)
at com.oracle.odof.core.TransactionManager.processCommand(TransactionManager.java:773)
at com.oracle.odof.core.WorkflowManager.processCommand(WorkflowManager.java:401)
at com.oracle.odof.core.WorkflowManager.processWork(WorkflowManager.java:459)
at com.oracle.odof.io.AbstractClient.run(AbstractClient.java:42)
at java.lang.Thread.run(Thread.java:662)
Caused by: com.oracle.ovm.mgr.api.exception.IllegalOperationException: OVMAPI_4004E Server Failed Command: dispatch https://?uname?:[email protected]:8899/api/2 start_vm 0004fb00000300003907f6fd90ef0e08 0004fb00000600009526838f3d4be255, Status: org.apache.xmlrpc.XmlRpcException: exceptions.RuntimeError:Command: ['xm', 'create', '/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg'] failed (1): stderr: Error: HVM guest support is unavailable: is VT/AMD-V supported by your CPU and enabled in your BIOS?
stdout: Using config file "/OVS/Repositories/0004fb00000300003907f6fd90ef0e08/VirtualMachines/0004fb00000600009526838f3d4be255/vm.cfg".
Sun Jul 29 14:57:14 PDT 2012
at com.oracle.ovm.mgr.action.ActionEngine.sendAction(ActionEngine.java:798)
at com.oracle.ovm.mgr.action.ActionEngine.sendCommandToServer(ActionEngine.java:503)
... 41 more
End of Job

As far you are using VirtualBox, your processor capabilities shouldn't counted (min from my own experience while setting up the virtual machine. Change the Domain Type under configuation node to XEN PVM and try again. Most probably the virtual machine will start running.
One more thing, enable promiscuous mode -> Allow allow with your network configuration (if bridged network is in use) for the VM Server prior you try to SSH into the virtual machine (your guest on VM Server)
All the best and post your test results
regards,
raj

How to use TCP Checksum Off-load in my network driver

I am seeking infomation on how to use TCP Checksum Off-load to tell the Solaris 8 stack not to handle it for both receives and transmits (and let our NIC handle this compute-intensive task instead).
There is mention that Sun GigabitEthernet Adapter cards, Release 1.1 supports Sol-2.6 use of NIC features: TCP checksum offload & byte swapping
There are limited bits of info in include files. For example
sys/strick.h indicates use of:
inetcksum_t's ick_xmit
stream.h has:
struct datab's unsigned u16:16; /* used to store hw-calculated cksum
#define STRUIO_IP 0x04 /* IP checksum stored in db_struioun */
#define STRUIO_ZC 0x08 /* mblk eligible for zero-copy */
strsub.h has:
struct zero_copy_kstat
Also /include/inet/tcp.h has tcp_sum for outbound.
Thank you. -Weimin Tchen

VenK7337,
Could you show your python code. so we know what your are "writing" to the ethernet port?
That way we can see what you are receiving.
Parsing the incoming data (from the TCP-read) depends heavily on the device that sends it, and can not generically be described. LabVIEW has many byte (and even bit) manipulation functions to convert many different data formats to its own build in formats.
So after the TCP listener is connected, you are constantly reading from the established connection (until it gets broken of course). More advanced example would be the internet toolkit if oyu have it.
From the read characters (and I hope you designed a protocol with a clear starting character, ending character and maybe even a build in checksum) you parse the data and perform you action, and of course generate a reply. Again the internet toolkit is a good example. It parsed the input as it comes it, based on the HTTP format. Then generates the reply based on the request received.
These days I would suggest not to use binairy encoded numerics. Try and use XML formatted data. Yes, it causes a lot of overhead. But typically this is not an issue and makes the code a lot more portable and maintainable. Also makes it easier to interface with other languages/platforms.
Umless of course you are looking at Khz data rates, then XML is not th preferred choice.
Hope this helps...

Sending command apdu with a byte array as CDATA

Hi,
I am learning java card as part of my final year project. So far I think I can do most of the basic things but I have got stuck at one particular point.
I know that there are different constructors for creating a command apdu object and a number of these constructors take an array of bytes as CDATA values.
My problem is, how to access this array of data in the card side because apdu.getBuffer() returns an array of integers (bytes)? And what is actually on apdu.getBuffer()[ISO7816.OFFSET_CDATA)] location when you send command apdu object using such a constuctor?
regards
Edited by: 992194 on 06-Mar-2013 06:12

992194 wrote:
(..) I should have mentioned earlier that my card use jc 2.2.1 version, and i have read from different places that this version does not support ExtendedLength facility.Indeed.
Also I understand the semantics of apdu.getBuffer()[ISO7816.OFFSET_CDATA] that is the first byte of the command data. My question is, this command data was initially supplied as an array of bytes. Something like this:
+new CommandAPDU(CLA, INS, P1, P2, DATA_ARRAY, Le)+
So when you call:
byte [] buffer = apdu.getBuffer()
So does this mean that the byte values inside DATA_ARRAY automatically occupy locations +buffer[ISO7816.OFFSET_CDATA]+ onwards inside the buffer?Yes. The length would be<tt> (short)(buffer[ISO7816.OFFSET_LC]&0xFF) </tt>. Notice the<tt> &0xFF </tt> is a must above 127 bytes.
Or their is a mechanism of extracting the DATA_ARRAY array itself?No.
In fact, in the interest of performance and portability in environments with little memory, the usual coding style is to pass<tt> buffer </tt>, an offset within that, and the length; rather than making an object, which would require a copy. Welcome to the real world of Java Card.

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