# Pad block in ieee802\_15\_4\_mac block **URL:** \ **Category:** GNU Radio\ **Created:** [March 24, 2014, 10:21pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018 "2014-03-24T22:21:06Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Detlef\_R](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/d/58f4c7/32.png) [@Detlef\_R](https://www.ruby-forum.com/u/Detlef_R)\ **Post date:** [March 24, 2014, 10:21pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/1 "2014-03-24T22:21:06Z")
Hello GR, How can I have a file source connected as a pad source to an hierarchical block ? More precisely, I have for example the hierarchical block ieee802\_15\_4\_mac, and instead of feeding the block in input with a socket pdu block I want to connect it to a file source and broadcast a word, #self.msg\_connect(self.gr\_socket\_pdu\_0, “pdus”, self.ieee802\_15\_4\_mac\_0, “app in”) # this is OK self.msg\_connect(self.blocks\_file\_source\_0, “source” , self.ieee802\_15\_4\_mac\_0, “app in”) ?? #this is not OK And the same in the receive path, I would like to connect a file sink to dump to. self.msg\_connect(self.ieee802\_15\_4\_mac\_0, “app out”, self.blocks\_file\_sink\_0, “sink”) ?? Regards, – View this message in context: [http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167.html](http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![naeo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@naeo](https://www.ruby-forum.com/u/naeo)\ **Post date:** [March 25, 2014, 12:30am UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/2 "2014-03-25T00:30:58Z")
Hi, On 24 Mar 2014, at 22:20, Ruecan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > And the same in the receive path, I would like to connect a file sink to > dump to. self.msg\_connect(self.ieee802\_15\_4\_mac\_0, “app out”, > self.blocks\_file\_sink\_0, “sink”) ?? Im not really sure if I get what you are trying to do, but you will receive PDUs from the MAC block so you can not just connect a file sink. The example pipes the PDUs to a socket and you can listen to that socket with netcat and pipe the output to a file with something like nc -u localhost 52001 \> foo.txt I guess this is what you want. Best, Bastian ---
**Author:** ![naeo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@naeo](https://www.ruby-forum.com/u/naeo)\ **Post date:** [March 25, 2014, 5:00pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/3 "2014-03-25T17:00:47Z")
Thank you Bastian, I was about to try the transceiver example provided but I got an error from the message strobe block in grc. Param - Message PMT(msg): Value “pmt.intern(“Hello World!\n”)” cannot be evaluated: ‘module’ object has no attribute ‘intern’ that message is in utils/udp.py so how can I redirect that message to the message strobe (if my understanding is correct) Regards, Ruecan – View this message in context: [http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167p47190.html](http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167p47190.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![naeo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@naeo](https://www.ruby-forum.com/u/naeo)\ **Post date:** [March 25, 2014, 7:00pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/4 "2014-03-25T19:00:07Z")
On 25 Mar 2014, at 16:51, Ruecan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Param - Message PMT(msg): > Value “pmt.intern(“Hello World!\n”)” cannot be evaluated: > ‘module’ object has no attribute intern’ I never got that error, but it looks like a problem of your GNU Radio installation. What version do you have installed and how did you install it? > that message is in utils/udp.py so how can I redirect that message to the > message strobe (if my understanding is correct) I dont get that, but it doesnt sound right. The udp.py script is an example how you can interface the flow graph from python. So if you want to send a message (or packet) with the transceiver you can - use a message strobe block - use netcat and send something to the socket PDU block of the flow graph - use the python script and send something to the socket PDU block of the flow graph Bastian ---
**Author:** ![naeo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@naeo](https://www.ruby-forum.com/u/naeo)\ **Post date:** [March 25, 2014, 7:31pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/5 "2014-03-25T19:31:43Z")
Bastian B.-2 wrote > I never got that error, but it looks like a problem of your GNU Radio > installation. What version do you have installed and how did you install > it? I am running GNU Radio 3.65, may be that block is not yet in the release. Bastian B.-2 wrote > flow graph > Still related to pmt.intern issue: I was looking for where that message > comes from so I find it in utils/udp.py But I may be wrong, means the > message strobe block does the job, and the text inside of it is the text > to > be broadcasted. – View this message in context: [http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167p47194.html](http://gnuradio.4.n7.nabble.com/Pad-block-in-ieee802-15-4-mac-block-tp47167p47194.html) Sent from the GnuRadio mailing list archive at [Nabble.com](http://Nabble.com). ---
**Author:** ![naeo](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/n/57b2e6/32.png) [@naeo](https://www.ruby-forum.com/u/naeo)\ **Post date:** [March 25, 2014, 9:14pm UTC](https://www.ruby-forum.com/t/pad-block-in-ieee802-15-4-mac-block/240018/6 "2014-03-25T21:14:41Z")
On 25 Mar 2014, at 19:30, Ruecan [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Bastian B.-2 wrote > > > I never got that error, but it looks like a problem of your GNU Radio > > installation. What version do you have installed and how did you install > > it? > > I am running GNU Radio 3.65, may be that block is not yet in the release. You need at least v3.7