Xbee3 BLU Silent exit

XBee & XBee Gateway XBee Micropython & IDE plugin
1

I have an Xbee BLU -TH device running firmware version 4001 that is sending an array of data via a bluetooth connection to a windows PC.

my send function is very simple and works well. However, after around ~3000 iteration my xbee restarts without any notifications. I have put Try: statements around my main loop and I am parodically checking memory usage. below is a snippit of my code. Has anyone else observed this behavior?

def send_user_data(int16_values):

p = build_payload(int16_values)

try:

    relay.send(relay.BLUETOOTH, p)

    return True, None

except Exception as e:

    print("\[SEND\] ERROR: %s" % str(e))

    return False, str(e)
2

I have not heard of this. Are you running any source of GC collection?

3

The issue ended up being with the a hardware watchdog on the external board the xbee was connected to. We were previously using pin 6 on the Xbee Pro to wack the watchdog but the Xbee BLU does not allow that pin to be referenced. I am now having issues with ERROR: [Errno 7105] ENOBUFS but that is a separate issue.

4

That means that the buffers are full and you have not cleared them properly.

5

That what i figured. I am trying to send data at the maximum possible rate so I am seeing how fast and how much data I can send. My goal is to send integer data at ~500 Hz (100 points every 0.2 seconds). Other than just slowing down, are there commands to set larger buffers or do you suggest a different method of sending data. My current code can run for about 10 minuets before the buffers get full.

6

No, there are no commands you can issue to change the size of the internal buffers. Your just going to have to slow down on how often you are transmitting.

7

My starting point was calling relay.send(relay.BLUETOOTH, payload) 5 time a second. I can get up to 116 values in my payload before I start getting the error “ message too long”.

8

You are likely exceeding the max payload size for the version of the BLE standard that has been implemented. From what I recall, you are limited to 244 bytes. But I could be off.