From 4bdd90cc887d85587f366d9b1cf8d59c39d9ced4 Mon Sep 17 00:00:00 2001
From: David Cermak <cermak@espressif.com>
Date: Tue, 26 Mar 2024 14:43:30 +0100
Subject: [PATCH] fix(modem): Fixed UART task to check for buffered data
 periodically

Closes https://github.com/espressif/esp-protocols/issues/536
---
 components/esp_modem/src/esp_modem_uart.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/components/esp_modem/src/esp_modem_uart.cpp b/components/esp_modem/src/esp_modem_uart.cpp
index deb84ddf2a..df7b4882bc 100644
--- a/components/esp_modem/src/esp_modem_uart.cpp
+++ b/components/esp_modem/src/esp_modem_uart.cpp
@@ -160,6 +160,11 @@ void UartTerminal::task()
                 ESP_LOGW(TAG, "unknown uart event type: %d", event.type);
                 break;
             }
+        } else {
+            uart_get_buffered_data_len(uart.port, &len);
+            if (len && on_read) {
+                on_read(nullptr, len);
+            }
         }
     }
 }