…ect().

Starting with IDF v4.0 the VFS layer obtains a semaphore from the LwIP VFS adapter if there is at least one socket in the fd_set, if none are present a binary semaphore is created and passed to the VFS adapters in the fd_set. Any VFS adapter can wake up the select() call early by invoking the esp_vfs_select_triggered/_isr API.

This will be reverted after arduino-esp32 2.0.0-alpha2 (or later) once ESP-IDF #6463 has been picked up.

…ackBase.

Needs a bit more debugging and testing, when there is no CAN transceiver attached (or the CAT5 is unplugged) the stack appears to be blocked when using add_can_port_async. add_can_port_select works but needs more testing.

…provided one.

Added version check for TWAI.

…rev0 module

ESP32-C3 works with TWAI Async API. select() API is not triggering wakeup, will investigate further.

ESP32-S2 TWAI does not work correctly due to IDF issue.

The TWAI driver can end up in a state where the OpenMRN stack is waiting for a notification that will never come. This typically will occur if the TWAI driver is not successful in talking to the CAN transceiver but can also happen if there is no terminator or cable connecting the node to other nodes.

When the watchdog detects that the TWAI driver is remaining in a RECOVERY state since the last reporting period (10sec) it will attempt to recover the bus again. This typically occurs when the ESP32 fails to communicate with the CAN transceiver (missing transceiver, broken connection, etc).

When the watchdog detects that either the RX or TX queues have pending frames but has not changed since the last reporting period, the queue will be purged and the OpenMRN stack woken up if it was waiting. This can happen when the ESP32 failes to communicate with the CAN transceiver. Without this watchdog the OpenMRN stack can end up blocked indefinitely.

…th TWAI.

…s guaranteed to be set.

…re not being generated in arduino-esp32.

Simplified select() implementation to not track semaphore validity as a boolean.

…nt node-id and snip data on startup.

S2 enabled USB CDC redirect of log output option. Enabling this option will incur a 5sec delay during startup to allow USB to startup and allow PC recognition of the CDC.

…ts for using select() based API and reordered constructor parameters.

…ino dependencies.

…tic support

…locally.

… in ESP-IDF

…ect initialization of Atomic

2. Handle case of mDNS publish failure (server not ready or previously published)

… this API.

…ask creation.

Filed espressif/esp-idf#7498 to track a fix to the endian.h upstream.