use "explorenfc-basic" in python (raspberry pi, jessie, explore-nfc-ww)

1. Use "explorenfc-basic > file.txt" to write the output to any file you want.
2. Use python read file to looking at <text> you want.
3. Write proper <text>.
4. Clem

Hello!

Thank you for the answer it helped me a lot.

Do you also know how to kill the explorenfc-basic command?

"pkill -9 explorenfc-basic"

You need to install pkill software. See https://www.digitalocean.com/community/tutorials/how-to-use-ps-kill-and-nice-to-manage-processes-in-linux for details.

Clem

I have a big problem with the combination of writing and reading...

I don't get it that i write the tag every time and after that to read it out to check that the written text on the tag is the same as it should be.

Sometimes the writing on the tag is fine, but then is the reading not fine and so on. But most of the time it is not working anyway.

The code what i have written:

        writeTag = Popen(["explorenfc-basic -w %s -t URI -l d" %(text that i want to write on the tag) ],stdin=PIPE,stdout=PIPE,stderr=PIPE,shell=True)

        writeTag.poll()

        Popen(["pkill -9 (explorenfc-basic)"],shell=True)

        print("Tag wurde erfolgreich beschrieben")

        nfcTag = Popen(["explorenfc-basic > nfc.txt"],stdin=PIPE,stdout=PIPE,stderr=PIPE,shell=True)

        nfcTag.poll()

        file = open('nfc.txt','r')

        tag = file.read()

        file.close()

        print(tag)

What can I improve that it works fine?

To remember, I am a totally beginner with python and Raspberry

Like i have written before I have the problem with the combination of writing and reading.

I want to write the tag and in the next line I want to read out the tag to compare the written string with the string which is really on the tag (safety reasons).

I established that when I write "writeTag.wait()"  and "nfcTag.wait()" instead of .poll it is no problem to write and read the tag. My problem is that i have to remove the tag from the NXP-shield every time to write or to read the tag. First I thought that i can fix that with killing the process, but it is not like that.

I have tried a few thinks but the best result was, that the tag was written and when I wanted to read the tag in the next step i got the information which was on the tag before.

So my question: Is it possible without removing the tag of the NXP-shield to write the tag and straight after this to read the tag?

Hi,

Are you using nxppy? Please read  http://cache.nxp.com/documents/application_note/AN11480.pdf?fpsp=1&WT_TYPE=Application%20Notes&WT_VENDOR=FREESCALE&WT_FI…  and check reference 9 for download. Or https://github.com/svvitale/nxppy

Clem

EXPLORE-NFC - Exclusive from element14|NXP

Hello Clem,

No I am not using nxppy. I want to keep the program as simple as possible and the nxppy looks more complicated to me than the explorenfc-basic command. Or do I need the nxppy for my task?

With the writeTag.wait() and readTag.wait() I get the behaviour that I want, except what I have written before, I don't want to remove every time my tag from the shield (for my application it is not sustainable to do this the whole time).

My code looks like this now:

###############################

def writeNFCTag(Text):

        while True:

            try:

                writeTag = Popen(["explorenfc-basic -w '%s' -t URI -l d" %(Text)], shell=True)

                #writeTag.wait()

                print("Write at tag: success!")

                break

            except:

                print("Write at tag: FAIL!")

                pass

def readNFCTag():

        while True:

                try:

                        readTag = Popen(["explorenfc-basic > /home/pi/Desktop/nfc.txt"], shell = True)

                        #readTag.wait()

                        print("Write in file: Success!")

                        break

                except:

                        print("Write in file: FAIL!")

                        pass

x = J

while x == J or x == j:

     Text = <text that should be written on the tag>

     writeNFCTag(Text)

     readNFCTag()

     x = input("Again? ")

###############################

Hello Clem,

No I am not using nxppy. I want to keep the program as simple as possible and the nxppy looks more complicated to me than the explorenfc-basic command. Or do I need the nxppy for my task?

With the writeTag.wait() and readTag.wait() I get the behaviour that I want, except what I have written before, I don't want to remove every time my tag from the shield (for my application it is not sustainable to do this the whole time).

My code looks like this now:

###############################

def writeNFCTag(Text):

        while True:

            try:

                writeTag = Popen(["explorenfc-basic -w '%s' -t URI -l d" %(Text)], shell=True)

                #writeTag.wait()

                print("Write at tag: success!")

                break

            except:

                print("Write at tag: FAIL!")

                pass

def readNFCTag():

        while True:

                try:

                        readTag = Popen(["explorenfc-basic > /home/pi/Desktop/nfc.txt"], shell = True)

                        #readTag.wait()

                        print("Write in file: Success!")

                        break

                except:

                        print("Write in file: FAIL!")

                        pass

x = J

while x == J or x == j:

     Text = <text that should be written on the tag>

     writeNFCTag(Text)

     readNFCTag()

     x = input("Again? ")

###############################

Oh and I have installed the .deb files of Neard EXPLORE-NFC "SW282715"

Assuming you use python, nxppy would be easier and clear for anyone to understand. It wraps the api.

Clem