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My data looks like this when it comes from the device (biofeedback device). There are 9 bytes in total, and I need to buffer so much, and then poll it for new/recent packets. The start packet unfortunately starts with 0x00

So far the only thing I've found that looks like what I want to do is this, but I don't know how to implement it. http://code.activestate.com/recipes/408859/


Data: [0000002d0270025e00]
Data: [0001004a0006026547]
Data: [0002004b000a026343]
Data: [00]
Data: [03004f0006025b4a00]
Data: [046698000802569d00]
Data: [00003002830257f100]
Data: [01004a000602585400]
Data: [020048000a025b4e00]
Data: [03004b0006025b4e00]
Data: [046698000702579d00]
Data: [00002f027602480e00]
Data: [01004a0006024b61]
Data: [0002004a000a025552]
Data: [0003004b0006025752]
Data: [00046698000702569e]
Data: [0000002c025b025321]
Data: [00010048000602505e]

My code so far looks like this...

import bluetooth, sys, time, os, binascii, struct;

# Create the client socket
client_socket=BluetoothSocket( RFCOMM )

client_socket.connect(("10:00:E8:AC:4D0", 1))

data = ""
try:
while True:
try:
data = client_socket.recv(9)
except bluetooth.BluetoothError, b:
print "Bluetooth Error: ", b

if len(data) > 0:
print "Data: [%s]" % binascii.hexlify(data)

except KeyboardInterrupt:
#print "Closing socket...",
client_socket.close()
#print "done."

On 2012-12-14 00:00, Barry Dick wrote:
> My data looks like this when it comes from the device (biofeedback device). There are 9 bytes in total, and I need to buffer so much, and then poll it for new/recent packets. The start packet unfortunately starts with 0x00
>
> So far the only thing I've found that looks like what I want to do is this, but I don't know how to implement it. http://code.activestate.com/recipes/408859/
>
>
> Data: [0000002d0270025e00]
> Data: [0001004a0006026547]
> Data: [0002004b000a026343]
> Data: [00]
> Data: [03004f0006025b4a00]
> Data: [046698000802569d00]
> Data: [00003002830257f100]
> Data: [01004a000602585400]
> Data: [020048000a025b4e00]
> Data: [03004b0006025b4e00]
> Data: [046698000702579d00]
> Data: [00002f027602480e00]
> Data: [01004a0006024b61]
> Data: [0002004a000a025552]
> Data: [0003004b0006025752]
> Data: [00046698000702569e]
> Data: [0000002c025b025321]
> Data: [00010048000602505e]
>
> My code so far looks like this...
>
> import bluetooth, sys, time, os, binascii, struct;
>
> # Create the client socket
> client_socket=BluetoothSocket( RFCOMM )
>
> client_socket.connect(("10:00:E8:AC:4D0", 1))
>
> data = ""
> try:
> while True:
> try:
> data = client_socket.recv(9)
> except bluetooth.BluetoothError, b:
> print "Bluetooth Error: ", b
>
> if len(data) > 0:
> print "Data: [%s]" % binascii.hexlify(data)
>
> except KeyboardInterrupt:
> #print "Closing socket...",
> client_socket.close()
> #print "done."
>
Is the following more like how you want it?

data = ""
try:
while True:
try:
more = client_socket.recv(9)
except bluetooth.BluetoothError, b:
print "Bluetooth Error: ", b
else:
data += more

while len(data) >= 9:
print "Data: [%s]" % binascii.hexlify(data[ : 9])
data = data[9 : ]
except KeyboardInterrupt:
#print "Closing socket...",
client_socket.close()
#print "done."

You could, of course, decide to recv more than 9 bytes at a time. It
could return less than you asked for (but it should block until at
least 1 byte is available), but it will never return more than you
asked for.

> Is the following more like how you want it?
>
>
>
> data = ""
>
> try:
>
> while True:
>
> try:
>
> more = client_socket.recv(9)
>
> except bluetooth.BluetoothError, b:
>
> print "Bluetooth Error: ", b
>
> else:
>
> data += more
>
>
>
> while len(data) >= 9:
>
> print "Data: [%s]" % binascii.hexlify(data[ : 9])
>
> data = data[9 : ]
>
> except KeyboardInterrupt:
>
> #print "Closing socket...",
>
> client_socket.close()
>
> #print "done."
>
>
>
> You could, of course, decide to recv more than 9 bytes at a time. It
>
> could return less than you asked for (but it should block until at
>
> least 1 byte is available), but it will never return more than you
>
> asked for.

Thank you for your interest and quick reply.

Its a great start, seeing as I'm a beginner with python, I was actually hoping to see an example of http://code.activestate.com/recipes/408859/ as it appears to be exactly what I need, but I haven't got a clue how to implement it. Basically as each byte perhaps gets read or 9 bytes at a time, that way I can seek out as much real data as possible

Data: [0000002c025b025321]
Data: [00010048000602505e]
Data: [0002004a000a025552]
Data: [0003004b0006025752]
Data: [00046698000702569e]

(notice the header data[9:1] will always flow in this pattern 0 -> 4 and then back again, so I figure that might as well be my start)


And skip the errors...

Data: [0002004b000a026343]
Data: [00]
Data: [03004f0006025b4a00]
Data: [046698000802569d00]
Data: [00003002830257f100]

> Is the following more like how you want it?
>
>
>
> data = ""
>
> try:
>
> while True:
>
> try:
>
> more = client_socket.recv(9)
>
> except bluetooth.BluetoothError, b:
>
> print "Bluetooth Error: ", b
>
> else:
>
> data += more
>
>
>
> while len(data) >= 9:
>
> print "Data: [%s]" % binascii.hexlify(data[ : 9])
>
> data = data[9 : ]
>
> except KeyboardInterrupt:
>
> #print "Closing socket...",
>
> client_socket.close()
>
> #print "done."
>
>
>
> You could, of course, decide to recv more than 9 bytes at a time. It
>
> could return less than you asked for (but it should block until at
>
> least 1 byte is available), but it will never return more than you
>
> asked for.

Thank you for your interest and quick reply.

Its a great start, seeing as I'm a beginner with python, I was actually hoping to see an example of http://code.activestate.com/recipes/408859/ as it appears to be exactly what I need, but I haven't got a clue how to implement it. Basically as each byte perhaps gets read or 9 bytes at a time, that way I can seek out as much real data as possible

Data: [0000002c025b025321]
Data: [00010048000602505e]
Data: [0002004a000a025552]
Data: [0003004b0006025752]
Data: [00046698000702569e]

(notice the header data[9:1] will always flow in this pattern 0 -> 4 and then back again, so I figure that might as well be my start)


And skip the errors...

Data: [0002004b000a026343]
Data: [00]
Data: [03004f0006025b4a00]
Data: [046698000802569d00]
Data: [00003002830257f100]