From 66d6aece65a7517f77c396576938c8224eae8b52 Mon Sep 17 00:00:00 2001
From: Benjamin Valentin <benjamin.valentin@ml-pa.com>
Date: Wed, 23 Oct 2024 14:41:45 +0200
Subject: [PATCH] nanocoap_sock: output diagnostic response when DEBUG is
 enabled

---
 sys/net/application_layer/nanocoap/sock.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys/net/application_layer/nanocoap/sock.c b/sys/net/application_layer/nanocoap/sock.c
index 0b8343523e..5f5f48bf75 100644
--- a/sys/net/application_layer/nanocoap/sock.c
+++ b/sys/net/application_layer/nanocoap/sock.c
@@ -615,6 +615,8 @@ static int _block_cb(void *arg, coap_pkt_t *pkt)
 
     int res = _get_error(pkt);
     if (res) {
+        pkt->payload[pkt->payload_len] = 0;
+        DEBUG("nanocoap: %u '%s'\n", coap_get_code_decimal(pkt), (char *)pkt->payload);
         return res;
     }