From 8649ff343c688658c10367ff21048bb3c274e731 Mon Sep 17 00:00:00 2001
From: Tom Van Eyck <tom.vaneyck@telenet.be>
Date: Fri, 25 Sep 2026 01:08:52 +0200
Subject: [PATCH] Update return value in UART ISR for GDB stub

Change return value from 0 to size when gdbstub is active to follow function contract.
---
 cores/esp8266/uart.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp8266/uart.cpp b/cores/esp8266/uart.cpp
index 802072d438..020d4a39e7 100644
--- a/cores/esp8266/uart.cpp
+++ b/cores/esp8266/uart.cpp
@@ -537,7 +537,7 @@ uart_write(uart_t* uart, const char* buf, size_t size)
 
     if(gdbstub_has_uart_isr_control() && uart->uart_nr == UART0) {
         gdbstub_write(buf, size);
-        return 0;
+        return size;
     }
 
     size_t ret = size;