Update esp32_can_builtin.cpp #73
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Set msg.timestamp to micros() as soon as possible after CAN frame is received.
Was version 0.2.5, now 0.2.5.1
Incremented version to 0.2.6 added msg.timestamp = micros(); in esp32_can_builtin.cpp for more accurate timestamps when saving to SD card.
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Inside ESP32CAN::processFrame(twai_message_t &frame), msg.timestamp is now set to micros() as soon as possible after CAN frame is received.
This will be used in a forked version of A0RET (renamed to ESP32_RET_SD to prevent confusion) that it records all CAN data (in SavvyCAN CSV format) to an SD card until a SavvyCAN wifi connection, then the SD CAN data log stops. This allows a simple to use "offline" plug and play "CAN to SD" mode as well as the fantastic features of SavvyCAN.
This greatly reduces the average inter-frame interval to within 1-3 mSec, as writing data to an SD card does not have a predictable duration. Before this change the average inter-frame interval would be more than 100ms.
I don't think it changes anything for wifi sendFrameToBuffer() in gvret_com.cpp (line 517) as it gets the current micros() and uses that for the timestamp.
A0RET based ESP32_RET_SD will be released after a few more days of testing in my car.
(I hope this follows the proper procedure as I am very new to github, so any coaching/correcting is appreciated)