OOM errors

[emarsman]

With increased memory for multi-frame diagnostics (1287437), devices can run out of memory when processing large amounts of CAN messages (

vi-firmware/src/payload/json.cpp

Line 669 in 25b93b0

debug("JSON object is NULL -- probably OOM");

).

Current master works fine for diagnostics, but issues with large amounts of CAN traffic.

Related to #375.

[emarsman]

can-oom branch makes this better. Works for standard translated signals. Full bus raw CAN still locks up device (Ref VI, works on C5). Could be running into this problem?

vi-firmware/src/vi_firmware.cpp

Line 261 in 45eeb2a

// In normal operation, if no output interface is enabled/attached (e.g.

Need to investigate further.