I have found that it was due to the fact that the library contained a variable that it access. I commented the line that was freeing the memory (which is used on Windows version of the library) and it does work. However, I do have a different problem with the function using ath_motor_mappings_t& out I have no idea how to make proper convention for this parameter. the function is void Merge( ath_motor_mappings_t a, ath_motor_mappings_t b, ath_motor_mappings_t& out) I have tried using     typealias Merge = @convention(c) (ath_motor_mappings_t, ath_motor_mappings_t, UnsafeMutablePointer<ath_motor_mappings_t>) -> Void     typealias Merge = @convention(c) (ath_motor_mappings_t, ath_motor_mappings_t, ath_motor_mappings_t) -> Void but both gives me EXC_BAD_ACCESS error. is there a convention that can specify reference?

Here is the cipher of the client that is ran on my local machine. Cipher Suite: Reserved (GREASE) (0x0a0a) Cipher Suite: TLS_AES_128_GCM_SHA256 (0x1301) Cipher Suite: TLS_AES_256_GCM_SHA384 (0x1302) Cipher Suite: TLS_CHACHA20_POLY1305_SHA256 (0x1303) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (0xc02c) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b) Cipher Suite: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca9) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f) Cipher Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca8) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (0xc00a) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (0xc009) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013) Cipher Suite: TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d) Cipher Suite: TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c) Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035) Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f) Cipher Suite: TLS_ECDHE_ECDSA_WITH_3DES_EDE_CBC_SHA (0xc008) Cipher Suite: TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (0xc012) Cipher Suite: TLS_RSA_WITH_3DES_EDE_CBC_SHA (0x000a) I also see that ask is not included, so from my code, I commented out sec_protocol_options_add_pre_shared_key, but same no shared cipher error occurs.

Hello, Thanks for the replies I been using Wireshark to check the packets. I have a list of cipher suit that client is sending. Now the problem is, I am not certain how to do "TLS backend negotiate it's own cipher suite and do not pin a cipher to the context". I am not certain if my code is pinning a cipher to the context via sec_protocol_options_append_tls_ciphersuite. Would you elaborate this part further? below is the client's cipher suit. this client is different from what I used on my macOS client. this was sent from Windows remotely from proper client that we have used. Cipher Suites (31 suites) Cipher Suite: TLS_AES_256_GCM_SHA384 (0x1302) Cipher Suite: TLS_CHACHA20_POLY1305_SHA256 (0x1303) Cipher Suite: TLS_AES_128_GCM_SHA256 (0x1301) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 (0xc02c) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (0xc030) Cipher Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x009f) Cipher Suite: TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca9) Cipher Suite: TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xcca8) Cipher Suite: TLS_DHE_RSA_WITH_CHACHA20_POLY1305_SHA256 (0xccaa) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 (0xc02b) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 (0xc02f) Cipher Suite: TLS_DHE_RSA_WITH_AES_128_GCM_SHA256 (0x009e) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 (0xc024) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 (0xc028) Cipher Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA256 (0x006b) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 (0xc023) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 (0xc027) Cipher Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA256 (0x0067) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA (0xc00a) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014) Cipher Suite: TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x0039) Cipher Suite: TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA (0xc009) Cipher Suite: TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013) Cipher Suite: TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x0033) Cipher Suite: TLS_RSA_WITH_AES_256_GCM_SHA384 (0x009d) Cipher Suite: TLS_RSA_WITH_AES_128_GCM_SHA256 (0x009c) Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA256 (0x003d) Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA256 (0x003c) Cipher Suite: TLS_RSA_WITH_AES_256_CBC_SHA (0x0035) Cipher Suite: TLS_RSA_WITH_AES_128_CBC_SHA (0x002f) Cipher Suite: TLS_EMPTY_RENEGOTIATION_INFO_SCSV (0x00ff)

hello, so I set max tls to 1.2 and trying to use terminal for packet trace. However, I never really did packet tracing in the past as I rarely dealt server side. I only studied fundamental network course in uni and I mostly worked front-end, so doing server related set up is very new to me. Can you give me an advise on how to search the packet that I need to be looking for? is there easier program that I can use other than using "sudo tcpdump -I en0 -n"? Maybe I am doing the packet trace wrong if I am running both app on the same MacOS? I appreciate your help! The error I get for server side app 2022-08-12 10:45:52.428775+0900 bhapticsPlayerSUI[2591:36563] [boringssl] boringssl_context_handle_fatal_alert(1967) [C6:2][0x108f0c9b0] write alert, level: fatal, description: handshake failure 2022-08-12 10:45:52.428873+0900 bhapticsPlayerSUI[2591:36563] [boringssl] boringssl_context_error_print(1957) [C6:2][0x108f0c9b0] Error: 4444958104:error:100000b8:SSL routines:OPENSSL_internal:NO_SHARED_CIPHER:/AppleInternal/Library/BuildRoots/20d6c351-ee94-11ec-bcaf-7247572f23b4/Library/Caches/com.apple.xbs/Sources/boringssl/ssl/handshake_server.cc:841: 2022-08-12 10:45:52.429811+0900 bhapticsPlayerSUI[2591:36563] [boringssl] boringssl_session_handshake_incomplete(86) [C6:2][0x108f0c9b0] SSL library error 2022-08-12 10:45:52.429920+0900 bhapticsPlayerSUI[2591:36563] [boringssl] boringssl_session_handshake_error_print(41) [C6:2][0x108f0c9b0] Error: 4444958104:error:100000b8:SSL routines:OPENSSL_internal:NO_SHARED_CIPHER:/AppleInternal/Library/BuildRoots/20d6c351-ee94-11ec-bcaf-7247572f23b4/Library/Caches/com.apple.xbs/Sources/boringssl/ssl/handshake_server.cc:841: connection 5 did fail, error: -9858: Optional(handshake failed) -9858: Optional(handshake failed) error I get from client app 2022-08-12 10:45:52.428835+0900 SwiftWebSocketClient[3108:41786] [boringssl] boringssl_context_handle_fatal_alert(1967) [C1.1:2][0x13de06490] read alert, level: fatal, description: handshake failure 2022-08-12 10:45:52.429871+0900 SwiftWebSocketClient[3108:41786] [boringssl] boringssl_session_handshake_incomplete(86) [C1.1:2][0x13de06490] SSL library error 2022-08-12 10:45:52.429890+0900 SwiftWebSocketClient[3108:41786] [boringssl] boringssl_session_handshake_error_print(41) [C1.1:2][0x13de06490] Error: 5352022792:error:10000410:SSL routines:OPENSSL_internal:SSLV3_ALERT_HANDSHAKE_FAILURE:/AppleInternal/Library/BuildRoots/20d6c351-ee94-11ec-bcaf-7247572f23b4/Library/Caches/com.apple.xbs/Sources/boringssl/ssl/tls_record.cc:594:SSL alert number 40 2022-08-12 10:45:52.429903+0900 SwiftWebSocketClient[3108:41786] [boringssl] boringssl_session_handshake_error_print(41) [C1.1:2][0x13de06490] Error: 5352022792:error:1000009a:SSL routines:OPENSSL_internal:HANDSHAKE_FAILURE_ON_CLIENT_HELLO:/AppleInternal/Library/BuildRoots/20d6c351-ee94-11ec-bcaf-7247572f23b4/Library/Caches/com.apple.xbs/Sources/boringssl/ssl/handshake.cc:670: 2022-08-12 10:45:52.429913+0900 SwiftWebSocketClient[3108:41786] [boringssl] nw_protocol_boringssl_handshake_negotiate_proceed(757) [C1.1:2][0x13de06490] handshake failed at state 12288: not completed 2022-08-12 10:45:52.438117+0900 SwiftWebSocketClient[3108:41786] Connection 1: received failure notification 2022-08-12 10:45:52.438171+0900 SwiftWebSocketClient[3108:41786] Connection 1: failed to connect 3:-9824, reason -1 2022-08-12 10:45:52.438185+0900 SwiftWebSocketClient[3108:41786] Connection 1: encountered error(3:-9824) 2022-08-12 10:45:52.442545+0900 SwiftWebSocketClient[3108:41786] Task <870977F2-49BF-4B6A-91A4-2A5038C65020>.<1> HTTP load failed, 0/0 bytes (error code: -1200 [3:-9824]) 2022-08-12 10:45:52.443561+0900 SwiftWebSocketClient[3108:41792] Task <870977F2-49BF-4B6A-91A4-2A5038C65020>.<1> finished with error [-1200] Error Domain=NSURLErrorDomain Code=-1200 "An SSL error has occurred and a secure connection to the server cannot be made." UserInfo={NSErrorFailingURLStringKey=wss://localhost:15882/, NSErrorFailingURLKey=wss://localhost:15882/, NSLocalizedRecoverySuggestion=Would you like to connect to the server anyway?, _NSURLErrorRelatedURLSessionTaskErrorKey=(     "LocalWebSocketTask <870977F2-49BF-4B6A-91A4-2A5038C65020>.<1>" ), _NSURLErrorFailingURLSessionTaskErrorKey=LocalWebSocketTask <870977F2-49BF-4B6A-91A4-2A5038C65020>.<1>, NSLocalizedDescription=An SSL error has occurred and a secure connection to the server cannot be made.}

I am currently trying to resolve Error: 4939879480:error:100000b8:SSL routines:OPENSSL_internal:NO_SHARED_CIPHER error. Am I missing an option here? any help would be appreciated.   private static func tlsOptions(psk: String, pskIdentity: String,queue: DispatchQueue) -> NWProtocolTLS.Options {         let tlsOptions = NWProtocolTLS.Options()         let allowInsecure = true         //   let pskData = Data(psk.utf8)         let authenticationKey = SymmetricKey(data: psk.data(using: .utf8)!)         var authenticationCode = HMAC<SHA256>.authenticationCode(for: "1234".data(using: .utf8)!, using: authenticationKey)         let authenticationDispatchData = withUnsafeBytes(of: &authenticationCode) { (ptr: UnsafeRawBufferPointer) in             DispatchData(bytes: ptr)         }                  /*     let pskDispatchData = pskData.withUnsafeBytes { buf in          DispatchData(bytes: buf)          }*/                  let pskIdentityData = Data(pskIdentity.utf8)         let pskIdentityDispatchData = pskIdentityData.withUnsafeBytes { buf in             DispatchData(bytes: buf)         }         sec_protocol_options_set_min_tls_protocol_version(tlsOptions.securityProtocolOptions, .TLSv12)         sec_protocol_options_append_tls_ciphersuite(             tlsOptions.securityProtocolOptions,             tls_ciphersuite_t(rawValue: UInt16(TLS_PSK_WITH_AES_128_CBC_SHA256))!         )         sec_protocol_options_append_tls_ciphersuite(             tlsOptions.securityProtocolOptions,             tls_ciphersuite_t(rawValue: UInt16(TLS_PSK_WITH_AES_128_GCM_SHA256))!         )         sec_protocol_options_append_tls_ciphersuite(             tlsOptions.securityProtocolOptions,             tls_ciphersuite_t(rawValue: UInt16(TLS_PSK_WITH_AES_256_CBC_SHA384))!         )         sec_protocol_options_append_tls_ciphersuite(             tlsOptions.securityProtocolOptions,             tls_ciphersuite_t(rawValue: UInt16(TLS_PSK_WITH_AES_256_GCM_SHA384))!         )         sec_protocol_options_set_verify_block(tlsOptions.securityProtocolOptions, { (sec_protocol_metadata, sec_trust, sec_protocol_verify_complete) in                          let trust = sec_trust_copy_ref(sec_trust).takeRetainedValue()                          var error: CFError?             if SecTrustEvaluateWithError(trust, &error) {                 sec_protocol_verify_complete(true)             } else {                 if allowInsecure == true {                     sec_protocol_verify_complete(true)                 } else {                     sec_protocol_verify_complete(false)                 }             }                      }, queue)         sec_protocol_options_set_peer_authentication_required(tlsOptions.securityProtocolOptions, false)         sec_protocol_options_add_pre_shared_key(             tlsOptions.securityProtocolOptions,             authenticationDispatchData as __DispatchData,             pskIdentityDispatchData as __DispatchData         )         return tlsOptions     }