Using network commands in log handler is not recommended

[nzottmann]

This log handler is sending udp packets in the log handler function:

ParticlePapertrail/src/papertrail.cpp

Line 28 in ab2a083

int ret = m_udp.sendPacket(packet, packet.length(), m_address, m_port);

Using network functions in the log handler function is not recommended:

I would recommend not doing anything that takes any time or can block from the log handler. This includes publishing, network, and any shared resource calls like SPI.
https://community.particle.io/t/udp-or-particle-publish-in-log-handler-causing-freeze-with-system-thread/56826/4

Using this log handler in combination with SYSTEM_THREAD(ENABLED) can cause freezes on 3rd gen Devices, as described in the Particle forum thread linked above.

To solve this, the logs could be saved to a buffer and the network functions moved to the main loop, as suggested and implemented by @rickkas7 in https://github.com/rickkas7/SdCardLogHandlerRK