sterwill

// Demonstrates a lock-up with the Feather M0 + ATWINC1500 while attemping
// to write a byte of data to a TCP connection during a sustained read at
// full speed.
//
// Run a program that generates an endless stream of bytes on a host 
// you can reach from your network ("yes | nc -k -l -p 9999"), customize 
// the code below to connect to it, then run the sketch and watch the output
// on a serial monitor.
//
// You can use "pv" on the server side to rate-limit the stream.

sterwill

// Demonstrates a slowdown/hang on the Feather M0 + ATWINC1500 that
// happens when sending more than a few bytes at a time on an SSL connection
// that's receiving data at medium-high speed.  This issue only seems to 
// affect connections over SSL/TLS.  Plain TCP connections don't seem to
// exhibit this problem (or perhaps there's less overhead so the buffers
// aren't as full so often).
//
// To reproduce this problem you'll need to run a program on a server that the
// Feather can reach that accepts SSL/TLS connections and sends an endless
// stream of data to clients.  OpenSSL's "s_server" program can do this easily,

sterwill

#!/usr/bin/env python3
#
# Copyright 2020 Carica Labs, LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#