drivers: modem_cellular: added APP RDY signal handling #93052
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Some modems (e.g. Quectel BG95/EG25-G, several SIMCom parts) print “APP RDY” when the application core is ready. Parse this line and proceed from AWAIT_POWER_ON immediately, while keeping the existing startup timeout as a fall-back. * add MODEM_CELLULAR_EVENT_APP_RDY + chat match * open UART and attach chat in AWAIT_POWER_ON * jump to SET_BAUDRATE / RUN_INIT_SCRIPT on event Signed-off-by: Van Petrosyan <van.petrosyan@sensirion.com>
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Some modems, such as the Quectel BG95/EG25-G, emit an
APP RDYmessage when the application core has fully initialized and is ready to process AT commands. By listening for this signal, the state machine can proceed earlier than the configuredstartup_time_ms, improving connection setup time.This patch:
MODEM_CELLULAR_EVENT_APP_RDYevent and a corresponding unsolicited chat match.AWAIT_POWER_ONstate, so thatAPP RDYcan be captured immediately.SET_BAUDRATEorRUN_INIT_SCRIPTas soon asAPP RDYis seen, while keeping the existing timeout as a fallback for modems that don't emit this message.Tested on a Quectel BG95-M3 on a custom board, where this change consistently advances the flow by several seconds, especially valuable for battery-powered applications where the modem is power-cycled frequently for short bursts of activity (e.g., uplink and shutdown). Over time, this can lead to noticeable energy savings :)
Modems that do not emit APP RDY will follow the same timeout-driven path as before. No behavioral regressions expected.