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Hot-swap TZ offset with browser locale in firmware binary #107

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thebentern opened this issue Oct 3, 2024 · 3 comments · May be fixed by #110
Open

Hot-swap TZ offset with browser locale in firmware binary #107

thebentern opened this issue Oct 3, 2024 · 3 comments · May be fixed by #110
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@jp-bennett @thebentern
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enhancement New feature or request

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@thebentern
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Flow in bash:
sed -i 's/tzplaceholder /CST6CDT,M3.2.0,M11.1.0\x0/' firmware.bin
truncate --size=-32 firmware.bin
sha256sum firmware.bin | xxd -r -ps >> firmware.bin
@thebentern thebentern added the enhancement New feature or request label Oct 3, 2024
@thebentern
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https://github.com/nayarsystems/posix_tz_db/blob/master/zones.csv

@jp-bennett
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We will need to ask esptool to generate a byte of checksum, and replace the 33rd byte from the end of the file. Then the last 32 bytes can be trimmed and replaced with the sha256sum.

@jp-bennett
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Rak4631 doesn't need any hashing or checksum modifications. Just overwrite the placeholder bytes with the right string and null-terminate it. RP 2040 still to be checked.

@thebentern thebentern linked a pull request Oct 5, 2024 that will close this issue
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Not quite working: Posix TZ hotswap meshtastic/web-flasher
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@jp-bennett @thebentern