ENOMEM when sending udp packet to disconnected address
Posted: Mon Sep 09, 2024 1:41 pm
I'm using a WT-32-S1 to send udp packets to another device over ethernet.
When the other device is connected to the network packets send without issue every 100ms however when the device is not connected to the network I receive an ENOMEM error after only two packets are sent.
When lwip debugging is on I can see the issue is:
I've increased the ETH_DMA_TX_BUFFER_NUM to the maximum with no effect.
When the other device is connected to the network packets send without issue every 100ms however when the device is not connected to the network I receive an ENOMEM error after only two packets are sent.
When lwip debugging is on I can see the issue is:
Code: Select all
etharp_query: could not queue the packet 0x3ffafcf8 (queue is full)Code: Select all
lwip_sendto(54, data=0x3ffb02dc, short_size=2, flags=0x8 to=192.168.4.200 port=9999
pbuf_alloc(length=2)
pbuf_alloc(length=2) == 0x3ffafcf8
netconn_send
netconn_send: sending 2 bytes
UDP_SENDTO
pbuf_add_header: old 0x3ffafd40 new 0x3ffafd38 (8)
pbuf_add_header: old 0x3ffafd38 new 0x3ffafd24 (20)
ip4_output_if: en0
IP header:
+-------------------------------+
| 4 | 5 | 0x00 | 30 | (v, hl, tos, len)
+-------------------------------+
| 3 |000| 0 | (id, flags, offset)
+-------------------------------+
| 64 | 17 | 0xf045 | (ttl, proto, chksum)
+-------------------------------+
| 192 | 168 | 4 | 110 | (src)
+-------------------------------+
| 192 | 168 | 4 | 200 | (dest)
+-------------------------------+
ip4_output_if: call netif->output()
etharp_find_entry: found matching entry 0
pbuf_free(0x3ffafcf8)
pbuf_free: 0x3ffafcf8 has ref 1, ending here.
etharp_query: could not queue the packet 0x3ffafcf8 (queue is full)
pbuf_free(0x3ffafcf8)
pbuf_free: deallocating 0x3ffafcf8
E (4413) NETSTOP: Error occurred during sending: errno 12, -1