Method poll

tests/fl/channels/channel_manager.cpp:93–102

    }

    DriverState poll() override {
        if (mShouldFail) {
            return DriverState::ERROR;
        }
        // Fake implementation: always return READY (transmission completes instantly)
        if (!mTransmittingChannels.empty()) {
            mTransmittingChannels.clear();
        }
        return DriverState::READY;
    }

private:
    void beginTransmission(fl::span<const ChannelDataPtr> channels) {