Change log


2.1.2 – 2022-02-28

Fix performance on the ESP32.


  • Include lwIP headers directly so that messages can be sent faster on the ESP32.

2.1.1 – 2022-02-23

Silence irrelevant compiler warnings when building on the ESP32.


  • Silence compiler warnings/errors about %S in a format string.

2.1.0 – 2022-01-27

More visibility of the log message queue and control over the rate at which messages are dispatched.


  • Function to get the current size of the log message queue.

  • Symbols to control the UDP message sending delay:




    It is inadvisable to change these because UDP packets may be queued and then discarded by the platform when the queue limit is reached.


  • Relax IPv6 scope checking when waiting for a local address to allow either global or local unicast addresses to be used with any global or local unicast destination. Previously they had to be the same type.

2.0.6 – 2021-04-18

Upgrade to PlatformIO 5.


  • Use PlatformIO 5 dependency specification.

2.0.5 – 2021-01-17

Upgrade to the latest version of the logging library for static initialization and deinitialization fixes.


  • Don’t unregister handler explicitly in the destructor, this is now handled by the logging library.

2.0.4 – 2019-09-22

Fix log message transmit retries.


  • Log messages that failed to be sent are not left on the queue correctly and may cause a crash when they are retried.

  • Add memory barrier around checks for log queue overflow.

2.0.3 – 2019-09-21

Feature detection fixes.


  • Use gettimeofday() on the ESP32.

  • Don’t redefine UUID_SYSLOG_ARP_CHECK.

2.0.2 – 2019-09-20

Support IPv6 addresses.


  • Use move constructors on rvalues.

  • Support for IPv6 addresses.

2.0.1 – 2019-09-05

Bug fix for trace level messages.


  • Use debug level for trace level messages.

2.0.0 – 2019-09-03

Additional features and API changes.


  • Functions to get all of the configuration parameters.

  • Support for sending a -- MARK -- message when there is no activity for a configurable period of time.


  • Add log level to the message text.

  • Lower the log level of log level change messages to INFO.

  • Rename set_host() to destination().

  • Remove get_ and set_ from function names.


  • Function to set the maximum number of log messages is no longer limited to 0 or 1.

1.0.0 – 2019-09-01

First stable release.


  • Buffer messages during startup until configuration is provided.

  • Automatic use of system time if it is available.

  • Wait for the network to be available before transmitting.

  • Explicit ARP check for the destination host on ESP8266 and ESP32.

  • Rate limiting of output packets to avoid dropped messages.

  • Configurable destination host and log level.

  • Configurable local hostname.

  • Configurable queue size.