LWS_CALLBACK_EVENT_WAIT_CANCELLED event not supported for FreeRtos with lwip

[sush126]

Hi @lws-team ,
"On the Unix platform, when I call the lws_cancel_service() API, I receive the LWS_CALLBACK_EVENT_WAIT_CANCELLED event in the WebSocket callback function (lwscallback). However, on the FreeRTOS platform, I do not receive this event. Are there any similar events that I should expect from libwebsocket? I need to trigger lws_writable from within the callback function based on an event. Could you please suggest a solution for this?"

[lws-team]

Recent lws supports it on freertos... it uses two UDP sockets back - back to simulate a pipe().

[sush126]

i am using v4.3.2 can you please mention which recent version i can use it which has support for freertos LWS_CALLBACK_EVENT_WAIT_CANCELLED event

[lws-team]

It should have it, but does your lwip / freertos build support udp?

[sush126]

yes LWS_WITH_UDP is defined , please find below lws_config.h file

/* lws_config.h Generated from lws_config.h.in */

#ifndef NDEBUG
#ifndef _DEBUG
#define _DEBUG
#endif
#endif

#define LWS_INSTALL_DATADIR "D:/libwebsocket_plat/test/lws/.conan/data/websockets/1.0.6-4444617a/embeddedV/stable/package/36e27edb2c8581008f0583330e65cd1eddbe05ad/share"
#define LWS_INSTALL_LIBDIR "D:/libwebsocket_plat/test/lws/.conan/data/websockets/1.0.6-4444617a/embeddedV/stable/package/36e27edb2c8581008f0583330e65cd1eddbe05ad/lib"
#define LWS_LIBRARY_VERSION_MAJOR 4
#define LWS_LIBRARY_VERSION_MINOR 3
#define LWS_LIBRARY_VERSION_PATCH_ELABORATED 2-v4.3.2-2-g9d0a696d
#define LWS_LIBRARY_VERSION_PATCH 2

/* LWS_LIBRARY_VERSION_NUMBER looks like 1005001 for e.g. version 1.5.1 /
#define LWS_LIBRARY_VERSION_NUMBER (LWS_LIBRARY_VERSION_MAJOR * 1000000) +
(LWS_LIBRARY_VERSION_MINOR * 1000) +
LWS_LIBRARY_VERSION_PATCH
#define LWS_MAX_SMP 1
#define LWS_AMAZON_RTOS
/ #undef LWS_ESP_PLATFORM /
/ #undef LWS_LIBRARY_VERSION_NUMBER */

/* #undef LWS_EXT_PTHREAD_LIBRARIES */

/* #undef LWS_AVOID_SIGPIPE_IGN /
#define LWS_BUILD_HASH "v4.3.2-2-g9d0a696d"
/ #undef LWS_BUILTIN_GETIFADDRS /
#define LWS_CLIENT_HTTP_PROXYING
/ #undef LWS_DETECTED_PLAT_IOS /
/ #undef LWS_FALLBACK_GETHOSTBYNAME /
#define LWS_HAS_INTPTR_T
#define LWS_HAS_GETOPT_LONG
/ #undef LWS_HAVE__ATOI64 /
#define LWS_HAVE_ATOLL
/ #undef LWS_HAVE_BN_bn2binpad /
/ #undef LWS_HAVE_CLOCK_GETTIME /
/ #undef LWS_HAVE_EC_POINT_get_affine_coordinates /
/ #undef LWS_HAVE_EC_KEY_new_by_curve_name /
/ #undef LWS_HAVE_ECDSA_SIG_set0 /
/ #undef LWS_HAVE_EVP_MD_CTX_free /
/ #undef LWS_HAVE_EVP_aes_128_wrap /
/ #undef LWS_HAVE_EVP_aes_128_cfb8 /
/ #undef LWS_HAVE_EVP_aes_128_cfb128 /
/ #undef LWS_HAVE_EVP_aes_192_cfb8 /
/ #undef LWS_HAVE_EVP_aes_192_cfb128 /
/ #undef LWS_HAVE_EVP_aes_256_cfb8 /
/ #undef LWS_HAVE_EVP_aes_256_cfb128 /
/ #undef LWS_HAVE_EVP_aes_128_ofb /
/ #undef LWS_HAVE_EVP_aes_128_xts /
/ #undef LWS_HAVE_EVP_aes_128_ctr /
/ #undef LWS_HAVE_EVP_aes_128_ecb /
/ #undef LWS_HAVE_EVP_PKEY_new_raw_private_key /
/ #undef LWS_HAVE_EXECVPE /
#define LWS_HAVE_LOCALTIME_R
#define LWS_HAVE_GMTIME_R
#define LWS_HAVE_CTIME_R
/ #undef LWS_HAVE_GETGRGID_R /
/ #undef LWS_HAVE_GETGRNAM_R /
/ #undef LWS_HAVE_GETPWUID_R /
/ #undef LWS_HAVE_GETPWNAM_R /
/ #undef LWS_HAVE_LIBCAP /
/ #undef LWS_HAVE_HMAC_CTX_new /
#define LWS_HAVE_MALLOC_H
#define LWS_HAVE_MALLOC_TRIM
#define LWS_HAVE_MALLOC_USABLE_SIZE
/ #undef LWS_HAVE_mbedtls_md_setup /
/ #undef LWS_HAVE_mbedtls_net_init /
/ #undef LWS_HAVE_mbedtls_rsa_complete /
/ #undef LWS_HAVE_mbedtls_internal_aes_encrypt /
/ #undef LWS_HAVE_mbedtls_ssl_conf_alpn_protocols /
/ #undef LWS_HAVE_mbedtls_ssl_get_alpn_protocol /
/ #undef LWS_HAVE_mbedtls_ssl_conf_sni /
/ #undef LWS_HAVE_mbedtls_ssl_set_hs_ca_chain /
/ #undef LWS_HAVE_mbedtls_ssl_set_hs_own_cert /
/ #undef LWS_HAVE_mbedtls_ssl_set_hs_authmode /
/ #undef LWS_HAVE_mbedtls_ssl_set_verify /
/ #undef LWS_HAVE_mbedtls_x509_crt_parse_file /
#define LWS_HAVE_MBEDTLS_NET_SOCKETS
/ #undef LWS_HAVE_MBEDTLS_AUTH_KEY_ID /
/ #undef LWS_HAVE_NEW_UV_VERSION_H /
/ #undef LWS_HAVE_OPENSSL_ECDH_H /
/ #undef LWS_HAVE_OPENSSL_STACK /
/ #undef LWS_HAVE_PIPE2 /
/ #undef LWS_HAVE_EVENTFD /
#define LWS_HAVE_PTHREAD_H
/ #undef LWS_HAVE_RSA_SET0_KEY /
/ #undef LWS_HAVE_RSA_verify_pss_mgf1 /
/ #undef LWS_HAVE_SSL_CTX_get0_certificate /
/ #undef LWS_HAVE_SSL_CTX_load_verify_file /
/ #undef LWS_HAVE_SSL_CTX_load_verify_dir /
/ #undef LWS_HAVE_SSL_CTX_set1_param /
/ #undef LWS_HAVE_SSL_CTX_set_ciphersuites /
/ #undef LWS_HAVE_SSL_EXTRA_CHAIN_CERTS /
/ #undef LWS_HAVE_SSL_get0_alpn_selected /
/ #undef LWS_HAVE_SSL_CTX_EVP_PKEY_new_raw_private_key /
/ #undef LWS_HAVE_SSL_set_alpn_protos /
/ #undef LWS_HAVE_SSL_SET_INFO_CALLBACK /
/ #undef LWS_HAVE_SSL_SESSION_set_time /
/ #undef LWS_HAVE_SSL_SESSION_up_ref /
/ #undef LWS_HAVE__STAT32I64 /
#define LWS_HAVE_STDINT_H
/ #undef LWS_HAVE_SYS_CAPABILITY_H /
/ #undef LWS_HAVE_TIMEGM /
/ #undef LWS_HAVE_TLS_CLIENT_METHOD /
/ #undef LWS_HAVE_TLSV1_2_CLIENT_METHOD /
#define LWS_HAVE_SUSECONDS_T
/ #undef LWS_HAVE_UV_VERSION_H /
/ #undef LWS_HAVE_VFORK /
/ #undef LWS_HAVE_X509_get_key_usage /
/ #undef LWS_HAVE_X509_VERIFY_PARAM_set1_host /
#define LWS_LIBRARY_VERSION "4.3.2-v4.3.2-2-g9d0a696d"
#define LWS_LOGGING_BITFIELD_CLEAR 0
#define LWS_LOGGING_BITFIELD_SET 0
#define LWS_LOG_TAG_LIFECYCLE
/ #undef LWS_MINGW_SUPPORT /
/ #undef LWS_NO_CLIENT /
#define LWS_NO_DAEMONIZE
#define LWS_OPENSSL_CLIENT_CERTS "../share"
#define LWS_OPENSSL_SUPPORT
/ #undef LWS_PLAT_OPTEE /
/ #undef LWS_PLAT_UNIX /
#define LWS_PLAT_FREERTOS
/ #undef LWS_ROLE_CGI /
/ #undef LWS_ROLE_DBUS /
#define LWS_ROLE_H1
#define LWS_ROLE_H2
#define LWS_ROLE_RAW
#define LWS_ROLE_RAW_FILE
/ #undef LWS_ROLE_RAW_PROXY /
#define LWS_ROLE_WS
/ #undef LWS_ROLE_MQTT /
/ #undef LWS_SHA1_USE_OPENSSL_NAME /
#define LWS_SSL_CLIENT_USE_OS_CA_CERTS
/ #undef LWS_SSL_SERVER_WITH_ECDH_CERT /
#define LWS_SUPPRESS_DEPRECATED_API_WARNINGS
/ #undef LWS_TLS_LOG_PLAINTEXT_RX /
/ #undef LWS_TLS_LOG_PLAINTEXT_TX /
/ #undef LWS_WITH_ABSTRACT /
/ #undef LWS_WITH_ACCESS_LOG /
/ #undef LWS_WITH_ACME /
/ #undef LWS_WITH_ALSA /
/ #undef LWS_WITH_SYS_ASYNC_DNS /
/ #undef LWS_WITH_BORINGSSL /
/ #undef LWS_WITH_CGI /
/ #undef LWS_WITH_CONMON /
/ #undef LWS_WITH_COSE /
/ #undef LWS_WITH_CUSTOM_HEADERS /
/ #undef LWS_WITH_DEPRECATED_LWS_DLL /
/ #undef LWS_WITH_DETAILED_LATENCY /
/ #undef LWS_WITH_DIR /
/ #undef LWS_WITH_DRIVERS /
/ #undef LWS_WITH_ESP32 /
/ #undef LWS_HAVE_EVBACKEND_LINUXAIO /
/ #undef LWS_HAVE_EVBACKEND_IOURING /
/ #undef LWS_WITH_EXTERNAL_POLL /
/ #undef LWS_WITH_FILE_OPS /
/ #undef LWS_WITH_FSMOUNT /
/ #undef LWS_WITH_FTS /
/ #undef LWS_WITH_GENCRYPTO /
/ #undef LWS_WITH_GENERIC_SESSIONS /
/ #undef LWS_WITH_GLIB /
/ #undef LWS_WITH_GTK /
#define LWS_WITH_HTTP2
#define LWS_WITH_HTTP_BASIC_AUTH
/ #undef LWS_WITH_HTTP_BROTLI /
/ #undef LWS_HTTP_HEADERS_ALL /
/ #undef LWS_WITH_HTTP_PROXY /
/ #undef LWS_WITH_HTTP_STREAM_COMPRESSION /
#define LWS_WITH_HTTP_UNCOMMON_HEADERS
/ #undef LWS_WITH_IPV6 /
/ #undef LWS_WITH_JOSE /
/ #undef LWS_WITH_CBOR /
#define LWS_WITH_CBOR_FLOAT
#define LWS_WITH_LEJP
/ #undef LWS_WITH_LIBEV /
/ #undef LWS_WITH_LIBEVENT /
/ #undef LWS_WITH_LIBUV /
/ #undef LWS_WITH_SDEVENT /
#define LWS_WITH_LWSAC
#define LWS_LOGS_TIMESTAMP
#define LWS_WITH_MBEDTLS
/ #undef LWS_WITH_MINIZ /
/ #undef LWS_WITH_NETLINK /
#define LWS_WITH_NETWORK
/ #undef LWS_WITH_NO_LOGS /
/ #undef LWS_WITH_CACHE_NSCOOKIEJAR /
#define LWS_WITH_CLIENT
#define LWS_WITHOUT_EXTENSIONS
#define LWS_WITH_SERVER
/ #undef LWS_WITH_SPAWN /
/ #undef LWS_WITH_PEER_LIMITS /
/ #undef LWS_WITH_PLUGINS /
/ #undef LWS_WITH_PLUGINS_BUILTIN /
/ #undef LWS_WITH_POLARSSL /
#define LWS_WITH_POLL
#define LWS_WITH_RANGES
/ #undef LWS_WITH_RFC6724 /
/ #undef LWS_WITH_SECURE_STREAMS /
/ #undef LWS_WITH_SECURE_STREAMS_CPP /
/ #undef LWS_WITH_SECURE_STREAMS_SYS_AUTH_API_AMAZON_COM /
/ #undef LWS_WITH_SECURE_STREAMS_PROXY_API /
/ #undef LWS_WITH_SECURE_STREAMS_STATIC_POLICY_ONLY /
/ #undef LWS_WITH_SECURE_STREAMS_AUTH_SIGV4 /
/ #undef LWS_WITH_SECURE_STREAMS_BUFFER_DUMP /
/ #undef LWS_WITH_SS_DIRECT_PROTOCOL_STR /
/ #undef LWS_WITH_SELFTESTS /
/ #undef LWS_WITH_SEQUENCER /
/ #undef LWS_WITH_SERVER_STATUS /
#define LWS_WITH_SYS_SMD
/ #undef LWS_WITH_SMTP /
/ #undef LWS_WITH_SOCKS5 /
/ #undef LWS_WITH_STATEFUL_URLDECODE /
/ #undef LWS_WITH_STATS /
/ #undef LWS_WITH_STRUCT_SQLITE3 /
/ #undef LWS_WITH_STRUCT_JSON /
/ #undef LWS_WITH_SUL_DEBUGGING /
/ #undef LWS_WITH_SQLITE3 /
/ #undef LWS_WITH_SYS_DHCP_CLIENT /
/ #undef LWS_WITH_SYS_FAULT_INJECTION /
/ #undef LWS_WITH_SYS_METRICS /
/ #undef LWS_WITH_SYS_NTPCLIENT /
#define LWS_WITH_SYS_STATE
/ #undef LWS_WITH_THREADPOOL /
#define LWS_WITH_TLS
/ #undef LWS_WITH_TLS_JIT_TRUST /
#define LWS_WITH_TLS_SESSIONS
#define LWS_WITH_UDP
/ #undef LWS_WITH_ULOOP /
/ #undef LWS_WITH_UNIX_SOCK /
/ #undef LWS_WITH_ZIP_FOPS /
/ #undef USE_OLD_CYASSL /
/ #undef USE_WOLFSSL /
/ #undef LWS_WITH_EVENT_LIBS /
/ #undef LWS_WITH_EVLIB_PLUGINS /
/ #undef LWS_WITH_LIBUV_INTERNAL /
/ #undef LWS_WITH_PLUGINS_API /
/ #undef LWS_HAVE_RTA_PREF */

[lws-team]

Not lws, but your LWIP and FreeRTOS itself are configured for UDP support?

[sush126]

@lws-team UDP support is added in lwip and freertos .

[lws-team]

Well... OK. Then you'll have to debug it, is it giving back an error when you cancel the service?

Any sign in the verbose logs?

Try main branch of lws instead?

[sush126]

Below are the logs with v4.3.2 .

[LWS][1970/01/01 00:00:03:5260] N: 145192: lws_create_context: LWS: 4.3.2-v4.3.2-2-g9d0a696d, NET CLI SRV H1 H2 WS MbedTLS IPv6-absent

[LWS][1970/01/01 00:00:03:5270] I: 145192: lws_create_context: Event loop: poll

[LWS][1970/01/01 00:00:03:5270] D: 145016: _realloc: size 32: lws_smd_register (free heap 144984)

[LWS][1970/01/01 00:00:03:5270] I: 144976: lws_smd_register: peer 0x2001aa00 (cou nt 1) registered
[LWS][1970/01/01 00:00:03:5270] D: 144976: _realloc: size 240: fds table (free heap 144736)

[LWS][1970/01/01 00:00:03:5280] I: 144728: lws_create _context: ctx: 3932B (1884 ctx + pt(1 thr x 2048)), pt-fds: 30, fdmap: 240

[LWS] [1970/01/01 00:00:03:5280] I: 144728: lws_create_context: http: ah_data: 4096, ah: 752, max count 30
[LWS][1970/01/01 00:00:03:5330] D: 144552: _realloc: size 120: esp32 lws_lookup (free heap 144432)

[LWS][1970/01/01 00:00:03:5330] N: 144424: mem: platform fd map: 120 bytes

[LWS][[LWS][1970/01/01 00:00:03:5940] D: 107080: _realloc: size 996: __lws_wsi_create_with_role (f[LWS][1970/01/01 00:00:03: 5940] D: 106072: : lws_vhost_bind_wsi: vh Node_lx_0.txt: wsi none/none, count_bo und_wsi 1

[LWS][1970/01/01 00:00:03:5950] D: 106072: _realloc: size 316: client ws struct (free heap 105756)
[LWS][1970/01/01 00:00:03:5950] D: 105744: : lws_role _transition: wsistate 0x10000200, ops h1

[LWS][1970/01/01 00:00:03:5950] I: 105744: : lws_client_connect_via_info: role binding to h1

[LWS][1970/01/01 00:00:03:5950] I: 105744: : lws_client_connect_via_info: vh Node[LWS][1970/01/01 00:00:08:5 440] D: 99624: heap :99624 (-8664)
[LWS][1970/01/01 00:00:08:5440] I: 99624: [vh|0|default||-1]: lws_tls_check_cert_lifetime: vhost default: no cert

[LWS][1970/01/01 00:00:08:5440] I: 99624: [vh|1|Node_lx_0.txt|eth0|eth0|-1]: lws_tls_c

[lws-team]

I am not going to be able to debug this for you, it only happens on your platform.

It looks like your serial logs are truncated quite badly, unless it's a cut-and-paste problem (terminal emulator window width?) you will need to do something about it.

You should be seeing an info log from lib/plat/freertos/freertos-pipe.c during init

    lwsl_info("%s: cancel UDP skt port %d\n", __func__,
              ntohs(si->sin_port));

but it's hard to tell if it's missing with the logs all mangled.

[sush126]

Thanks @lws-team . This is working fine , i have configured wrong in lwip.