From 9cdd9c403ca360efb8da3418cbfefb3539795f3d Mon Sep 17 00:00:00 2001
From: proddy <paul@derbyshire.nl>
Date: Fri, 24 May 2019 15:30:21 +0200
Subject: [PATCH] 
 https://github.com/proddy/EMS-ESP/issues/103#issuecomment-495605798

---
 src/emsuart.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/emsuart.cpp b/src/emsuart.cpp
index 9c2c34c87..483b08ada 100644
--- a/src/emsuart.cpp
+++ b/src/emsuart.cpp
@@ -216,6 +216,9 @@ void ICACHE_FLASH_ATTR emsuart_tx_buffer(uint8_t * buf, uint8_t len) {
         */
 
         ETS_UART_INTR_DISABLE(); // disable rx interrupt
+
+        // clear Rx status register - https://github.com/proddy/EMS-ESP/issues/103#issuecomment-495605798
+        USC0(EMSUART_UART) |= (1 << UCRXRST); // reset uart rx fifo
         emsuart_flush_fifos();
 
         // throw out the telegram...