Function txStart

ESP32_AP-Flasher/src/serialap.cpp:80–92

#define ZBS_RX_WAIT_SUBCHANNEL 19

bool txStart() {
    while (1) {
        if (xPortInIsrContext()) {
            if (xSemaphoreTakeFromISR(txActive, NULL) == pdTRUE) return true;
        } else {
            if (xSemaphoreTake(txActive, portTICK_PERIOD_MS)) return true;
        }
        vTaskDelay(10 / portTICK_PERIOD_MS);
        Serial.println("wait... tx busy");
    }
    // this never happens. Should we make a timeout?
    return false;
}
void txEnd() {
    if (xPortInIsrContext()) {
        xSemaphoreGiveFromISR(txActive, NULL);