[Solved] Sipy randomically block on send

[Acme1999]

I've a strange behaviour on my Sipy
(MicroPython v1.8.6-849-86da809 on 2018-01-17; SiPy with ESP32)

Sometimes i'm able to send two messages, sometimes three, sometimes four before it hangs on send() and the led stay red.

sigfox = Sigfox(mode=Sigfox.SIGFOX, rcz=Sigfox.RCZ1);
s = socket.socket(socket.AF_SIGFOX, socket.SOCK_RAW);
s.setblocking(True);
s.setsockopt(socket.SOL_SIGFOX, socket.SO_RX, False);
pycom.rgbled(0x200000);
s.send(message);
pycom.rgbled(0x0f000f);
s.close();
pycom.rgbled(0x002000);
py.setup_sleep(600);
py.go_to_sleep();

Have you an idea?

Update January 31 2018:
I've updated the new firmware v1.15.0.b1 and the issue disappeared.

[Acme1999]

@rcolistete

the code is in main.py and runs stand alone.

The pysense is supplied by a tp4065 (charge battery by a solar panel) connect to usb.

[rcolistete]

How are you connecting, by USB cable or telnet ?
With LoPy, I have to use telnet to avoid long delays sending or receiving LoRa packets when "setblocking(True)".