diff --git a/drivers/at86rf215/at86rf215.c b/drivers/at86rf215/at86rf215.c
index 9df5cda50b..c107948fef 100644
--- a/drivers/at86rf215/at86rf215.c
+++ b/drivers/at86rf215/at86rf215.c
@@ -247,7 +247,7 @@ static bool _tx_ongoing(at86rf215_t *dev)
 int at86rf215_tx_prepare(at86rf215_t *dev)
 {
     if (dev->state == AT86RF215_STATE_SLEEP) {
-        return -EAGAIN;
+        return -ENETDOWN;
     }
 
     if (_tx_ongoing(dev)) {
diff --git a/drivers/at86rf215/at86rf215_netdev.c b/drivers/at86rf215/at86rf215_netdev.c
index 74eb08b65e..ea6661877b 100644
--- a/drivers/at86rf215/at86rf215_netdev.c
+++ b/drivers/at86rf215/at86rf215_netdev.c
@@ -149,10 +149,10 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
 {
     netdev_ieee802154_t *netdev_ieee802154 = container_of(netdev, netdev_ieee802154_t, netdev);
     at86rf215_t *dev = container_of(netdev_ieee802154, at86rf215_t, netdev);
-    size_t len = 0;
 
-    if (at86rf215_tx_prepare(dev)) {
-        return -EBUSY;
+    ssize_t len = at86rf215_tx_prepare(dev);
+    if (len) {
+        return len;
     }
 
     /* load packet data into FIFO */
@@ -176,9 +176,6 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
         at86rf215_tx_exec(dev);
     }
 
-    /* store successfully sent number of bytes */
-    dev->tx_frame_len = len;
-
     /* netdev_new just returns 0 on success */
     return 0;
 }
diff --git a/sys/net/gnrc/netif/gnrc_netif.c b/sys/net/gnrc/netif/gnrc_netif.c
index aa6cd4020f..6b6619bfc0 100644
--- a/sys/net/gnrc/netif/gnrc_netif.c
+++ b/sys/net/gnrc/netif/gnrc_netif.c
@@ -1807,7 +1807,7 @@ static void _tx_done(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt,
             return; /* early return to not release */
         }
         else {
-            LOG_ERROR("gnrc_netif: can't queue packet for sending\n");
+            LOG_ERROR("gnrc_netif: can't queue packet for sending, drop it\n");
             /* If we got here, it means the device was busy and the pkt queue
              * was full. The packet should be dropped here anyway */
             gnrc_pktbuf_release_error(pkt, ENOMEM);
@@ -1880,7 +1880,7 @@ static void _send(gnrc_netif_t *netif, gnrc_pktsnip_t *pkt, bool push_back)
             return;
         }
         else {
-            LOG_WARNING("gnrc_netif: can't queue packet for sending\n");
+            LOG_WARNING("gnrc_netif: can't queue packet for sending, try sending\n");
             /* try to send anyway */
         }
     }
diff --git a/tests/net/nanocoap_cli/nanocli_client.c b/tests/net/nanocoap_cli/nanocli_client.c
index 3266c69055..2f8351a14e 100644
--- a/tests/net/nanocoap_cli/nanocli_client.c
+++ b/tests/net/nanocoap_cli/nanocli_client.c
@@ -327,7 +327,7 @@ int nanotest_client_get_non_cmd(int argc, char **argv)
 {
     int res;
 
-    uint8_t response[CONFIG_NANOCOAP_BLOCKSIZE_DEFAULT];
+    uint8_t response[coap_szx2size(CONFIG_NANOCOAP_BLOCKSIZE_DEFAULT)];
 
     if (argc < 2) {
         printf("usage: %s <url>\n", argv[0]);