diff --git a/main/esp32-lora.c b/main/esp32-lora.c
index cbb7e95..5a08c8e 100644
--- a/main/esp32-lora.c
+++ b/main/esp32-lora.c
@@ -152,6 +152,8 @@ void lora32_enable_tx(lora32_cfg_t *lora) {
 void lora32_send(lora32_cfg_t *lora, uint8_t *data, uint8_t len) {
   if(lora == NULL) return;
 
+  xEventGroupWaitBits(lora->handle.state, MODE_ALL ^ MODE_TX, true, false, portMAX_DELAY);
+
   ESP_ERROR_CHECK(spi_device_acquire_bus(lora->spi, portMAX_DELAY));
 
   lora32_update_dio_mapping(lora, REG_DIO_MAPPING_1, DIO0_MODE_TXDONE, DIO0_MODE_SHIFT);