Route json crash fix#4
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Signed-off-by: faradaym <rcheyenne.truss@gmail.com>
Signed-off-by: TimoWielink <timowielink@gmail.com>
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This fixes a crash in MamaDuck route-packet handling on ESP32. RouteJSON was converting ArduinoJson::JsonDocument to std::string via json.asstd::string(), which shows up in the crash backtrace and appears to corrupt heap state during routed RX processing.
The change switches those conversions to explicit serializeJson(...), which is the safer/standard way to materialize JSON text on this target.