transport: serial: add SPI transport adapter - #256
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Add SPI master (broker) and slave (device) adapters for the pouch serial transport, including devicetree bindings, Kconfig options, and example applications for both sides. Rework the serial channel state machine to support explicit open/close transitions, channel suspension, and per-channel active tracking in the broker. The broker now restarts the exchange loop on completion or error instead of relying on the caller. Also includes: - Gateway cert logging and NULL-checks. - dts_root entry in module.yml so bindings are picked up. Signed-off-by: Trond Snekvik <trond.snekvik@canonical.com>
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Add SPI master (broker) and slave (device) adapters for the pouch serial transport, including devicetree bindings, Kconfig options, and example applications for both sides.
Rework the serial channel state machine to support explicit open/close transitions, channel suspension, and per-channel active tracking in the broker. The broker now restarts the exchange loop on completion or error instead of relying on the caller.
Also includes:
Targets the transport/serial branch, so staying in draft for now