From d9edd16d7a2cc8fa19ff50377f051d69be38fc70 Mon Sep 17 00:00:00 2001
From: Sam Perry <17242713+sdp8483@users.noreply.github.com>
Date: Fri, 23 Dec 2022 13:20:26 -0500
Subject: [PATCH] check if msg received

---
 examples/esp32can_receive/esp32can_receive.ino | 18 +++++++++---------
 1 file changed, 9 insertions(+), 9 deletions(-)

diff --git a/examples/esp32can_receive/esp32can_receive.ino b/examples/esp32can_receive/esp32can_receive.ino
index a8538f9..d533ee8 100644
--- a/examples/esp32can_receive/esp32can_receive.ino
+++ b/examples/esp32can_receive/esp32can_receive.ino
@@ -11,17 +11,17 @@ void setup() {
 void loop() {
   twai_message_t rx_frame;
   
-  ESP32Can.CANReadFrame(&rx_frame);
+  if (ESP32CAN_OK == ESP32Can.CANReadFrame(&rx_frame)) {  /* CAN message received*/
+    Serial.print(rx_frame.identifier, HEX);
+    Serial.print(" ");
+    Serial.print(rx_frame.data_length_code);
+    
+    for (int i=0; i<rx_frame.data_length_code; i++) {
+      Serial.print(rx_frame.data[i], HEX);
+    }
 
-  Serial.print(rx_frame.identifier, HEX);
-  Serial.print(" ");
-  Serial.print(rx_frame.data_length_code);
-  
-  for (int i=0; i<rx_frame.data_length_code; i++) {
-    Serial.print(rx_frame.data[i], HEX);
+    Serial.println();
   }
-
-  Serial.println();
   
   delay(1000);
 }