Serial connection error every other time I run my node discovery code

[sschirme]

I am successfully opening a local xbee on the correct serial port, and
then send the AT command ND (node discover) and print the response. I
do this in a while loop, to print all node serials in that network,
until the response is an "empty" one without a xbee serial.
The code runs fine without any warnings just after I plugged my local
coordinator xbee in the USB port.
I have 1 coordinator and two end devices, all in API mode 2, other
than that, default parameters, all S1 xbees.

However, if I run this code several times without physically
unplugging the local coordinator xbee in between, I get non-
deterministic strange errors.

Am I missing something? Should I do the node discovery in a different
way? Can I flush/reset the serial connection?


1. run ok

2. run:

[2012-02-15 15:02:13,505] [Animation Thread] [WARN]
[com.rapplogic.xbee.api.XBee] XBee radio is in API mode without escape
characters (AP=1). The radio must be configured in API mode with
escape bytes (AP=2) for use with this library.
** Error opening XBee port /dev/tty.usbserial-A8004xAX:
com.rapplogic.xbee.api.XBeeException **
(Exception printed out by me)
-> no serials of remote xbees printed

3. run:

[2012-02-15 15:05:55,777] [Animation Thread] [WARN]
[com.rapplogic.xbee.api.XBee] XBee radio is in API mode without escape
characters (AP=1). The radio must be configured in API mode with
escape bytes (AP=2) for use with this library.
[2012-02-15 15:05:56,554] [Animation Thread] [WARN]
[com.rapplogic.xbee.api.XBee] Unknown radio type (HV): 2
-> no serials of remote xbees printed

4. run ok

5. run:

[2012-02-15 15:09:47,771] [Animation Thread] [WARN]
[com.rapplogic.xbee.api.XBee] XBee radio is in API mode without escape
characters (AP=1). The radio must be configured in API mode with
escape bytes (AP=2) for use with this library.
[2012-02-15 15:09:48,558] [Animation Thread] [WARN]
[com.rapplogic.xbee.api.XBee] Unknown radio type (HV): 2
[2012-02-15 15:09:48,560] [Thread-5] [WARN]
[com.rapplogic.xbee.RxTxSerialComm] We were notified of new data but
available() is returning 0
-> no serials of remote xbees printed

[andrew]

Are you sure your process is ending after the first run? e.g. run ps
-ef | grep java

Would be helpful if you post the code