diff --git a/picotls/openssl.nim b/picotls/openssl.nim
new file mode 100644
index 0000000..5899589
--- /dev/null
+++ b/picotls/openssl.nim
@@ -0,0 +1,39 @@
+from std/openssl import
+  EVP_PKEY,
+  PEVP_MD,
+  PX509_STORE
+
+from picotls import
+  ptls_cipher_suite_t,
+  ptls_key_exchange_algorithm_t,
+  ptls_sign_certificate_t,
+  ptls_verify_certificate_t
+
+type
+  ptls_openssl_signature_scheme_t {.importc, header: "picotls/openssl.h", bycopy.} = object
+    scheme_id*: uint16
+    scheme_md*: PEVP_MD
+
+  ptls_openssl_sign_certificate_t {.importc, header: "picotls/openssl.h", bycopy.} = object
+    super*: ptls_sign_certificate_t
+    key*: EVP_PKEY
+    schemes*: array[4, ptls_openssl_signature_scheme_t]
+
+  ptls_openssl_verify_certificate_t {.importc, header: "picotls/openssl.h", bycopy.} = object
+    super*: ptls_verify_certificate_t
+    cert_store*: PX509_STORE
+
+proc ptls_openssl_random_bytes*(buf: pointer, len: csize_t) {.cdecl, importc,
+                               header: "picotls/openssl.h".}
+
+proc ptls_openssl_init_verifiy_certificate*(self: ptr ptls_openssl_verify_certificate_t,
+                                            store: PX509_STORE): cint {.cdecl,
+                                           importc, header: "picotls/openssl.h".}
+
+proc ptls_openssl_init_sign_certificate*(self: ptr ptls_openssl_sign_certificate_t,
+                                         key: EVP_PKEY): cint {.cdecl, importc,
+                                        header: "picotls/openssl.h".}
+
+var ptls_openssl_cipher_suites* {.importc, header: "picotls/openssl.h".}: ptr ptr ptls_cipher_suite_t
+
+var ptls_openssl_key_exchanges* {.importc, header: "picotls/openssl.h".}: ptr ptr ptls_key_exchange_algorithm_t
diff --git a/picotls/picotls.nim b/picotls/picotls.nim
new file mode 100644
index 0000000..60f0b6a
--- /dev/null
+++ b/picotls/picotls.nim
@@ -0,0 +1,280 @@
+const PTLS_MAX_DIGEST_SIZE = 64
+
+type
+  List*[T] = object
+    list*: ptr T
+    count*: csize_t
+
+  ptls_cipher_algorithm_t* {.importc, header: "picotls.h", bycopy.} = object
+    name*: cstring
+    key_size*: csize_t
+    block_size*: csize_t
+    iv_size*: csize_t
+    context_size*: csize_t
+    setup_crypto*: proc(ctx: ptr ptls_cipher_context_t, is_enc: cint,
+                        key: pointer): cint {.cdecl.}
+
+  ptls_aead_algorithm_t* {.importc, header: "picotls.h", bycopy.} = object
+    name*: cstring
+    confidentiality_limit*: uint64
+    integrity_limit*: uint64
+    ctr_cipher*: ptr ptls_cipher_algorithm_t
+    ecb_cipher*: ptr ptls_cipher_algorithm_t
+    key_size*: csize_t
+    iv_size*: csize_t
+    tag_size*: csize_t
+    context_size*: csize_t
+    setup_crypto*: proc(ctx: ptr ptls_aead_context_t, is_enc: cint,
+                        key: pointer, iv: pointer): cint {.cdecl.}
+
+  ptls_hash_final_mode_t* {.importc, header: "picotls.h".} = enum
+    PTLS_HASH_FINAL_MODE_FREE = 0,
+    PTLS_HASH_FINAL_MODE_RESET = 1,
+    PTLS_HASH_FINAL_MODE_SNAPSHOT = 2
+
+  ptls_hash_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    update*: proc(ctx: ptr ptls_hash_context_t, src: pointer, len: csize_t)
+                 {.cdecl.}
+    final*: proc(ctx: ptr ptls_hash_context_t, md: pointer,
+                 mode: ptls_hash_final_mode_t) {.cdecl.}
+    clone*: proc(src: ptr ptls_hash_context_t): ptr ptls_hash_context_t
+                {.cdecl.}
+
+  ptls_hash_algorithm_t* {.importc, header: "picotls.h", bycopy.} = object
+    block_size*: csize_t
+    digest_size*: csize_t
+    create*: proc(): ptr ptls_hash_context_t {.cdecl.}
+    empty_digest*: array[PTLS_MAX_DIGEST_SIZE, uint8]
+
+  ptls_cipher_suite_t* {.importc, header: "picotls.h", bycopy.} = object
+    id*: uint16
+    aead*: ptr ptls_aead_algorithm_t
+    hash*: ptr ptls_hash_algorithm_t
+
+  CipherSuiteListElem* = object
+    cipher_suite*: ptr ptls_cipher_suite_t
+    record_digest*: array[PTLS_MAX_DIGEST_SIZE, uint8]
+
+  VerifySignCb* = proc(verify_ctx: pointer, data: ptls_iovec_t,
+                       sign: ptls_iovec_t): cint {.cdecl.}
+
+  ptls_t* {.importc, header: "picotls.h", bycopy.} = object
+
+  ptls_key_exchange_algorithm_t* {.importc, header: "picotls.h", bycopy.} = object
+    id*: uint16
+    create*: proc(algo: ptr ptls_key_exchange_algorithm_t,
+                  ctx: ptr ptr ptls_key_exchange_context_t): cint {.cdecl.}
+    exchange*: proc(algo: ptr ptls_key_exchange_algorithm_t,
+                    pubkey: ptr ptls_iovec_t, secret: ptr ptls_iovec_t): cint
+                   {.cdecl.}
+    data*: pointer 
+
+  ptls_key_exchange_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    algo*: ptr ptls_key_exchange_algorithm_t
+    pubkey*: ptls_iovec_t
+    on_exchange*: proc(keyex: ptr ptr ptls_key_exchange_context_t, release: cint,
+                       secret: ptr ptls_iovec_t, peerkey: ptls_iovec_t): cint
+                      {.cdecl.}
+
+  ptls_esni_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    key_exchanges*: ptr ptr ptls_key_exchange_context_t
+    cipher_suites*: ptr CipherSuiteListElem
+    padded_length*: uint16
+    not_before*: uint64
+    not_after*: uint64
+    version*: uint16
+
+  ptls_iovec_t* {.importc, header: "picotls.h", bycopy.} = object
+    base*: uint8
+    len*: csize_t
+
+  ptls_on_client_hello_parameters_t* {.importc, header: "picotls.h", bycopy.} = object
+    server_name*: ptls_iovec_t
+    raw_message*: ptls_iovec_t
+    negotiated_protocols*: List[ptls_iovec_t]
+    signature_algorithms*: List[uint16]
+    certificate_compression_algorithms*: List[uint16]
+    cipher_suites*: List[uint16]
+    esni* {.bitsize: 1.}: cuint
+    incompatible_version* {.bitsize: 1.}: cuint
+
+  ptls_traffic_protection_t* {.importc, header: "picotls.h", incompleteStruct.} = object
+
+  ptls_message_emitter_t* {.importc, header: "picotls.h", bycopy.} = object
+    buf*: ptr ptls_buffer_t
+    enc*: ptr ptls_traffic_protection_t
+    record_header_length*: csize_t
+    begin_message*: proc (self: ptr ptls_message_emitter_t): cint {.cdecl.}
+    commit_message*: proc (self: ptr ptls_message_emitter_t): cint {.cdecl.}
+
+  ptls_key_schedule_t* {.importc, header: "picotls.h", bycopy.} = object
+
+  ptls_buffer_t* {.importc, header: "picotls.h", bycopy.} = object
+    base*: uint8
+    capacity*: csize_t
+    off*: csize_t
+    is_allocated*: cint
+
+  ptls_get_time_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_get_time_t): uint64 {.cdecl.}
+
+  ptls_on_client_hello_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_on_client_hello_t, tls: ptr ptls_t,
+             params: ptr ptls_on_client_hello_parameters_t): cint {.cdecl.}
+
+  ptls_emit_certificate_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_emit_certificate_t, tls: ptr ptls_t,
+             emitter: ptr ptls_message_emitter_t,
+             key_sched: ptr ptls_key_schedule_t, context: ptls_iovec_t,
+             push_status_request: cint, compress_algos: uint16,
+             num_compress_algos: csize_t): cint {.cdecl.}
+
+  ptls_sign_certificate_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_sign_certificate_t, tls: ptr ptls_t,
+             selected_algorithm: uint16, output: ptr ptls_buffer_t,
+             input: ptls_iovec_t, algorithms: uint16,
+             num_algorithms: csize_t): cint {.cdecl.}
+
+  ptls_verify_certificate_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_verify_certificate_t, tls: ptr ptls_t,
+             verify_sign: ptr VerifySignCb, verify_data: ptr pointer,
+             certs: ptls_iovec_t, numCerts: csize_t): cint {.cdecl.}
+
+  ptls_encrypt_ticket_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_encrypt_ticket_t, tls: ptr ptls_t, is_encrypt: cint,
+             dst: ptr ptls_buffer_t, src: ptls_iovec_t): cint {.cdecl.}
+
+  ptls_save_ticket_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_save_ticket_t, tls: ptr ptls_t, input: ptls_iovec_t):
+            cint {.cdecl.}
+
+  ptls_log_event_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_log_event_t, tls: ptr ptls_t, `type`: cstring,
+             fmt: cstring) {.cdecl, varargs.}
+
+  ptls_update_open_count_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_update_open_count_t, delta: BiggestInt) {.cdecl.}
+
+  ptls_update_traffic_key_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_update_traffic_key_t, tls: ptr ptls_t, is_enc: cint,
+             epoch: csize_t, secret: pointer): cint {.cdecl.}
+
+  ptls_decompress_certificate_t* {.importc, header: "picotls.h", bycopy.} = object
+    supported_algorithms*: uint16
+    cb: proc(self: ptr ptls_decompress_certificate_t, tls: ptr ptls_t,
+             algorithm: uint16, output: ptls_iovec_t, input: ptls_iovec_t): cint
+            {.cdecl.}
+
+  ptls_update_esni_key_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_update_esni_key_t, tls: ptr ptls_t, secret: ptls_iovec_t,
+             hash: ptls_hash_algorithm_t, hashed_esni_contents: pointer): cint
+            {.cdecl.}
+
+  ptls_on_extension_t* {.importc, header: "picotls.h", bycopy.} = object
+    cb: proc(self: ptr ptls_on_extension_t, tls: ptr ptls_t, hstype: uint8,
+             exttype: uint16, extdata: ptls_iovec_t): cint {.cdecl.}
+
+  ptls_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    random_bytes*: proc (buf: pointer, len: csize_t) {.cdecl.}
+    get_time*: ptr ptls_get_time_t
+    key_exchanges*: ptr ptr ptls_key_exchange_algorithm_t
+    cipher_suites*: ptr ptr ptls_cipher_suite_t
+    certificates*: List[ptls_iovec_t]
+    esni*: ptr ptr ptls_esni_context_t
+    on_client_hello*: ptr ptls_on_client_hello_t
+    emit_certificate*: ptr ptls_emit_certificate_t
+    sign_certificate*: ptr ptls_sign_certificate_t
+    verify_certificate*: ptr ptls_verify_certificate_t
+    ticket_lifetime*: uint32
+    max_early_data_size*: uint32
+    max_buffer_size*: csize_t
+    hkdf_label_prefix_obsolete: cstring
+    require_dhe_on_psk* {.bitsize: 1.}: cuint
+    use_exporter* {.bitsize: 1.}: cuint
+    send_change_cipher_spec* {.bitsize: 1.}: cuint
+    require_client_authentication* {.bitsize: 1.}: cuint
+    omit_end_of_early_data* {.bitsize: 1.}: cuint
+    encrypt_ticket*: ptr ptls_encrypt_ticket_t
+    save_ticket*: ptr ptls_save_ticket_t
+    log_event*: ptr ptls_log_event_t
+    update_open_count*: ptr ptls_update_open_count_t
+    update_traffic_key*: ptr ptls_update_traffic_key_t
+    decompress_certificate*: ptr ptls_decompress_certificate_t
+    update_esni_key*: ptr ptls_update_esni_key_t
+    on_extension*: ptr ptls_on_extension_t
+
+  ptls_cipher_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    algo*: ptr ptls_cipher_algorithm_t
+    do_dispose*: proc(ctx: ptr ptls_cipher_context_t) {.cdecl.}
+    do_init*: proc(ctx: ptr ptls_cipher_context_t, iv: pointer) {.cdecl.}
+    do_transform*: proc(ctx: ptr ptls_cipher_context_t, output: pointer,
+                        input: pointer, len: csize_t) {.cdecl.}
+
+  ptls_aead_supplementary_encryption_t* {.importc, header: "picotls.h", bycopy.} = object
+    ctx*: ptr ptls_cipher_context_t
+    input*: pointer
+    output*: array[16, uint8]
+
+  ptls_aead_context_t* {.importc, header: "picotls.h", bycopy.} = object
+    algo*: ptr ptls_aead_algorithm_t
+    dispose_crypto*: proc(ctx: ptr ptls_aead_context_t) {.cdecl.}
+    do_encrypt_init*: proc(ctx: ptr ptls_aead_context_t, seq: uint64,
+                           aad: pointer, aadlen: csize_t) {.cdecl.}
+    do_encrypt_update*: proc(ctx: ptr ptls_aead_context_t, output: pointer,
+                             input: pointer, inlen: csize_t): csize_t {.cdecl.}
+    do_encrypt_final*: proc(ctx: ptr ptls_aead_context_t, output: pointer):
+                           csize_t {.cdecl.}
+    do_encrypt*: proc(ctx: ptr ptls_aead_context_t, output: pointer,
+                      input: pointer, inlen: csize_t, seq: uint64, aad: pointer,
+                      aadlen: csize_t,
+                      supp: ptr ptls_aead_supplementary_encryption_t) {.cdecl.}
+
+  ClientProperties* {.bycopy.} = object
+    negotiated_protocols*: List[ptls_iovec_t]
+    session_ticket*: ptls_iovec_t
+    max_early_data_size*: ptr csize_t
+    early_data_acceptance*: ptls_early_data_acceptance_t
+    negotiate_before_key_exchange* {.bitsize: 1.}: cuint
+    esni_keys*: ptls_iovec_t
+
+  PskBinder* {.bycopy.} = object
+    base*: array[64, uint8]
+    len*: csize_t
+
+  Cookie* {.bycopy.} = object
+    key*: pointer
+    additional_data*: ptls_iovec_t
+
+  ServerProperties* {.bycopy.} = object
+    selected_psk_binder*: PskBinder
+    cookie*: Cookie
+    enforce_retry* {.bitsize: 1.}: cuint
+    retry_uses_cookie* {.bitsize: 1.}: cuint
+
+  ClientOrServer* {.union, bycopy.} = object
+    client*: ClientProperties
+    server*: ServerProperties
+
+  ptls_raw_extension_t* {.importc, header: "picotls.h", bycopy.} = object
+    `type`*: uint16
+    data*: ptls_iovec_t
+
+  ptls_early_data_acceptance_t* {.importc, header: "picotls.h".} = enum
+    PTLS_EARLY_DATA_ACCEPTANCE_UNKNOWN = 0,
+    PTLS_EARLY_DATA_REJECTED,
+    PTLS_EARLY_DATA_ACCEPTED
+  
+  ptls_handshake_properties_t* {.importc, header: "picotls.h", bycopy.} = object
+    properties*: ClientOrServer
+    additional_extensions*: ptr ptls_raw_extension_t
+    collect_extension*: proc (tls: ptr ptls_t;
+                            properties: ptr ptls_handshake_properties_t;
+                            `type`: uint16): cint {.cdecl.}
+    collected_extensions*: proc (tls: ptr ptls_t;
+                               properties: ptr ptls_handshake_properties_t;
+                               extensions: ptr ptls_raw_extension_t): cint {.cdecl.}
+
+var ptls_get_time* {.importc, header: "picotls.h".}: ptls_get_time_t
+
+proc ptls_load_certificates*(ctx: ptls_context_t, cert_pem_file: cstring) {.cdecl,
+                            importc, header: "picotls.h".}
diff --git a/quicly/.quicly.nim.swp b/quicly/.quicly.nim.swp
new file mode 100644
index 0000000..ac96205
Binary files /dev/null and b/quicly/.quicly.nim.swp differ
diff --git a/quicly/cc.nim b/quicly/cc.nim
new file mode 100644
index 0000000..1341398
--- /dev/null
+++ b/quicly/cc.nim
@@ -0,0 +1,5 @@
+type
+  quicly_cc_t* {.importc, header: "quicly/cc.h", bycopy.} = enum
+    CC_RENO_MODIFIED,
+    #CUBIC (RFC 8312)
+    CC_CUBIC
diff --git a/quicly/cid.nim b/quicly/cid.nim
new file mode 100644
index 0000000..0966107
--- /dev/null
+++ b/quicly/cid.nim
@@ -0,0 +1,22 @@
+type
+  quicly_cid_t* {.importc, header: "quicly/cid.h", bycopy.} = object
+    cid*: array[20, uint8]
+    len*: uint8
+
+  quicly_cid_plaintext_t* {.importc, header: "quicly/cid.h", bycopy.} = object
+    master_id*: uint32
+    path_id* {.bitsize: 8.}: uint32
+    thread_id* {.bitsize: 24.}: uint32
+    node_id*: uint64
+
+  quicly_cid_encryptor_t* {.importc, header: "quicly/cid.h", bycopy.} = object
+    encrypt_cid*: proc (self: ptr quicly_cid_encryptor_t;
+                      encrypted: ptr quicly_cid_t; stateless_reset_token: pointer;
+                      plaintext: ptr quicly_cid_plaintext_t) {.cdecl.}
+    decrypt_cid*: proc (self: ptr quicly_cid_encryptor_t;
+                      plaintext: ptr quicly_cid_plaintext_t; encrypted: pointer;
+                      len: csize_t): csize_t {.cdecl.}
+    generate_stateless_reset_token*: proc (self: ptr quicly_cid_encryptor_t;
+        token: pointer; cid: pointer): cint {.cdecl.}
+
+
diff --git a/quicly/constants.nim b/quicly/constants.nim
new file mode 100644
index 0000000..7005de6
--- /dev/null
+++ b/quicly/constants.nim
@@ -0,0 +1,62 @@
+from linklist import quicly_linklist_t
+from maxsender import quicly_maxsender_t
+
+from recvstate import
+  quicly_recvstate_t,
+  quicly_recvstate_transfer_complete
+
+from sendstate import
+  quicly_sendstate_t,
+  quicly_sendstate_is_open
+
+type
+  quicly_stream_id_t* {.importc, header: "quicly/constants.h", bycopy.} = int64
+
+  quicly_conn_t* {.importc, header: "quicly/constants.h", incompleteStruct.} = object
+
+  quicly_stream_callbacks_t* {.importc, header: "quicly.h", bycopy.} = object
+    on_destroy*: proc(stream: ptr quicly_stream_t, err: cint) {.cdecl.}
+    on_send_shift*: proc(stream: ptr quicly_stream_t, delta: csize_t) {.cdecl.}
+    on_send_emit*: proc(stream: ptr quicly_stream_t, off: csize_t, dst: pointer,
+                        len: csize_t, wrote_all: cint) {.cdecl.}
+    on_send_stop*: proc(stream: ptr quicly_stream_t, err: cint) {.cdecl.}
+    on_receive*: proc(stream: ptr quicly_stream_t, off: csize_t, src: pointer,
+                      len: csize_t) {.cdecl.}
+    on_receive_reset*: proc(stream: ptr quicly_stream_t, err: cint) {.cdecl.}
+
+  quicly_sender_state_t* {.importc, header: "quicly.h".} = enum
+    QUICLY_SENDER_STATE_NONE,
+    QUICLY_SENDER_STATE_SEND,
+    QUICLY_SENDER_STATE_UNACKED,
+    QUICLY_SENDER_STATE_ACKED,
+
+  StreamSendError* {.bycopy.} = object
+    sender_state*: quicly_sender_state_t
+    error_code: uint16
+
+  StreamSendPendingLink* {.bycopy.} = object
+    control*: quicly_linklist_t
+    default_scheduler*: quicly_linklist_t
+
+  StreamSendAux* {.bycopy.} = object
+    max_stream_data*: uint64
+    stop_sending*: StreamSendError
+    reset_stream*: StreamSendError
+    max_stream_data_sender*: quicly_maxsender_t
+    blocked*: quicly_sender_state_t
+    pending_link*: StreamSendPendingLink
+  
+  StreamRecvAux* {.bycopy.} = object
+    window*: uint32
+    max_ranges*: uint32
+
+  quicly_stream_t* {.importc, header: "quicly.h", bycopy.} = object
+    conn*: ptr quicly_conn_t
+    stream_id*: quicly_stream_id_t
+    callbacks*: ptr quicly_stream_callbacks_t
+    sendstate*: quicly_sendstate_t
+    recvstate*: quicly_recvstate_t
+    data*: pointer
+    streams_blocked* {.bitsize: 1.}: cuint
+    send_aux*: StreamSendAux
+    recv_aux*: StreamRecvAux
diff --git a/quicly/defaults.nim b/quicly/defaults.nim
new file mode 100644
index 0000000..4770c89
--- /dev/null
+++ b/quicly/defaults.nim
@@ -0,0 +1,5 @@
+from quicly import quicly_context_t
+
+var quicly_spec_context* {.importc, header: "quicly/defaults.h".}: quicly_context_t
+
+var quicly_performant_context* {.importc, header: "quicly/defaults.h".}: quicly_context_t
diff --git a/quicly/linklist.nim b/quicly/linklist.nim
new file mode 100644
index 0000000..c765941
--- /dev/null
+++ b/quicly/linklist.nim
@@ -0,0 +1,4 @@
+type
+  quicly_linklist_t* {.importc, header: "quicly/linklist.h", bycopy.} = object
+    prev*: ptr quicly_linklist_t
+    next*: ptr quicly_linklist_t
diff --git a/quicly/loss.nim b/quicly/loss.nim
new file mode 100644
index 0000000..f84e8ad
--- /dev/null
+++ b/quicly/loss.nim
@@ -0,0 +1,6 @@
+type
+  quicly_loss_conf_t* {.importc, header: "quicly/loss.h", bycopy.} = object
+    time_reordering_percentile*: cuint
+    min_pto*: uint32
+    default_initial_rtt*: uint32
+    num_speculative_ptos*: uint8
diff --git a/quicly/maxsender.nim b/quicly/maxsender.nim
new file mode 100644
index 0000000..012c2c4
--- /dev/null
+++ b/quicly/maxsender.nim
@@ -0,0 +1,10 @@
+type
+  quicly_maxsender_t* {.importc, header: "quicly/maxsender.h", bycopy.} = object
+    max_committed*: int64
+    max_acked*: int64
+    num_inflight*: csize_t
+    force_send* {.bitsize: 1.}: cuint
+
+  quicly_maxsender_sent_t* {.importc, header: "quicly/maxsender.h", bycopy.} = object
+    inflight* {.bitsize: 1.}: uint64
+    value* {.bitsize: 63.}: uint64
diff --git a/quicly/quicly.nim b/quicly/quicly.nim
new file mode 100644
index 0000000..3664c51
--- /dev/null
+++ b/quicly/quicly.nim
@@ -0,0 +1,222 @@
+from cc import quicly_cc_t
+from cid import quicly_cid_t, quicly_cid_encryptor_t, quicly_cid_plaintext_t
+from loss import quicly_loss_conf_t
+from nativesockets import SockAddr, Sockaddr_in, Sockaddr_in6, SockLen
+
+from constants import
+  quicly_conn_t,
+  quicly_stream_id_t,
+  quicly_stream_t
+
+from ../picotls/picotls import
+  ptls_aead_algorithm_t,
+  ptls_aead_context_t,
+  ptls_buffer_t,
+  ptls_cipher_context_t,
+  ptls_context_t,
+  ptls_handshake_properties_t,
+  ptls_hash_algorithm_t,
+  ptls_iovec_t
+
+type
+  quicly_address_t* {.importc, header: "quicly.h", bycopy.} = object
+    sa: SockAddr
+    sin: Sockaddr_in
+    sin6: Sockaddr_in6
+
+  Retry* {.bycopy.} = object
+    original_dcid*: quicly_cid_t
+    client_cid*: quicly_cid_t
+    server_cid*: quicly_cid_t
+
+  Resumption* {.bycopy.} = object
+    bytes*: array[256, uint8]
+    len*: csize_t
+
+  RetryOrResumption* {.union, bycopy.} = object
+    retry*: Retry
+    resumption*: Resumption
+
+  AppData* {.bycopy.} = object
+    bytes*: array[256, uint8]
+    len*: csize_t
+
+  AddressTokenType* {.bycopy.} = enum
+    QUICLY_ADDRESS_TOKEN_TYPE_RETRY
+    QUICLY_ADDRESS_TOKEN_TYPE_RESUMPTION
+
+  quicly_address_token_plaintext_t* {.importc, header: "quicly.h", bycopy.} = object
+    `type`: AddressTokenType
+    issued_at*: uint64
+    local*: quicly_address_t
+    remote*: quicly_address_t
+    type_specific*: RetryOrResumption
+    appdata*: AppData
+
+  quicly_stream_open_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_stream_open_t, stream: ptr quicly_stream_t): cint
+            {.cdecl.}
+
+  quicly_receive_datagram_frame_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_receive_datagram_frame_t, conn: ptr quicly_conn_t,
+             payload: ptls_iovec_t) {.cdecl.}
+
+  quicly_closed_by_remote_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_closed_by_remote_t, conn: ptr quicly_conn_t,
+             err: cint, frame_type: uint64, reason: cstring,
+             reason_len: csize_t) {.cdecl.}
+
+  quicly_now_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_now_t): int64 {.cdecl.}
+
+  quicly_save_resumption_token_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_save_resumption_token_t, conn: ptr quicly_conn_t,
+             token: ptls_iovec_t): cint {.cdecl.}
+
+  quicly_generate_resumption_token_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_generate_resumption_token_t,
+             conn: ptr quicly_conn_t, buf: ptr ptls_buffer_t,
+             token: ptr quicly_address_token_plaintext_t): cint {.cdecl.}
+
+  quicly_init_cc_t* {.importc, header: "quicly.h", bycopy.} = object
+    cb: proc(self: ptr quicly_init_cc_t, cc: ptr quicly_cc_t, initcwnd: uint32,
+             now: int64) {.cdecl.}
+
+  quicly_max_stream_data_t* {.importc, header: "quicly.h", bycopy.} = object
+    bidi_local*: uint64
+    bidi_remote*: uint64
+    uni*: uint64
+
+  quicly_transport_parameters_t* {.importc, header: "quicly.h", bycopy.} = object
+    max_stream_data*: quicly_max_stream_data_t
+    max_data*: uint64
+    max_idle_timeout*: uint64
+    max_streams_bidi*: uint64
+    max_streams_uni*: uint64
+    max_udp_payload_size*: uint64
+    ack_delay_exponent*: uint8
+    max_ack_delay*: uint8
+    min_ack_delay_usec*: uint64
+    disable_active_migration* {.bitsize: 1.}: uint8
+    active_connection_id_limit*: uint64
+    max_datagram_frame_size*: uint16
+ 
+  quicly_stream_scheduler_t* {.importc, header: "quicly.h", bycopy.} = object
+    can_send*: proc(sched: ptr quicly_stream_scheduler_t,
+                    conn: ptr quicly_conn_t, conn_is_saturated: cint): cint
+                   {.cdecl.}
+    do_send*: proc(sched: ptr quicly_stream_scheduler_t,
+                   stream: ptr quicly_stream_t): cint {.cdecl.}
+    update_state*: proc(sched: ptr quicly_stream_scheduler_t,
+                        stream: ptr quicly_stream_t): cint {.cdecl.}
+
+  quicly_crypto_engine_t* {.importc, header: "quicly.h", bycopy.} = object
+    setup_cipher*: proc(engine: ptr quicly_crypto_engine_t,
+                        conn: ptr quicly_conn_t, epoch: csize_t, is_enc: cint,
+                        header_protect_ctx: ptr ptr ptls_cipher_context_t,
+                        packet_protect_ctx: ptr ptr ptls_aead_context_t,
+                        aead: ptr ptls_aead_algorithm_t,
+                        hash: ptr ptls_hash_algorithm_t, secret: pointer): cint
+                       {.cdecl.}
+    encrypt_packet: proc(engine: ptr quicly_crypto_engine_t,
+                         conn: ptr quicly_conn_t,
+                         header_protect_ctx: ptr ptls_cipher_context_t,
+                         packet_protect_ctx: ptr ptls_aead_context_t,
+                         datagram: ptls_iovec_t, first_byte_at: csize_t)
+                        {.cdecl.}
+
+  quicly_context_t* {.importc, header: "quicly.h", bycopy.} = object
+    tls*: ptr ptls_context_t
+    initial_egress_max_udp_payload_size*: uint16
+    loss*: quicly_loss_conf_t
+    transport_params*: quicly_transport_parameters_t
+    max_packets_per_key*: uint64
+    max_crypto_bytes*: uint64
+    initial_version*: uint32
+    pre_validation_amplification_limit*: uint16
+    is_clustered* {.bitsize: 1.}: cuint
+    expand_client_hello* {.bitsize: 1.}: cuint
+    cid_encryptor*: ptr quicly_cid_encryptor_t
+    stream_open*: ptr quicly_stream_open_t
+    stream_scheduler*: ptr quicly_stream_scheduler_t
+    receive_datagram_frame*: ptr quicly_receive_datagram_frame_t
+    closed_by_remote*: ptr quicly_closed_by_remote_t
+    now*: ptr quicly_now_t
+    save_resumption_token*: ptr quicly_save_resumption_token_t
+    generate_resumption_token*: ptr quicly_generate_resumption_token_t
+    crypto_engine*: ptr quicly_crypto_engine_t
+    init_cc*: ptr quicly_init_cc_t
+
+  CidDest* {.bycopy.} = object
+    encrypted*: ptls_iovec_t
+    plaintext*: quicly_cid_plaintext_t
+    might_be_client_generated* {.bitsize: 1.}: cuint
+
+  Cid* {.bycopy.} = object
+    dest: CidDest
+    src: ptls_iovec_t
+
+  Decrypted* {.bycopy.} = object
+    pn: uint64
+    key_phase: uint64
+
+  IsStatelessReset* = enum
+    QUICLY_DECODED_PACKET_CACHED_MAYBE_STATELESS_RESET = 0,
+    QUICLY_DECODED_PACKET_CACHED_IS_STATELESS_RESET,
+    QUICLY_DECODED_PACKET_CACHED_NOT_STATELESS_RESET
+
+  quicly_decoded_packet_t* {.importc, header: "quicly.h", bycopy.} = object
+    octets*: ptls_iovec_t
+    cid*: Cid
+    version*: uint32
+    token*: ptls_iovec_t
+    encrypted_off*: csize_t
+    datagram_size*: csize_t
+    decrypted*: Decrypted
+    is_stateless_reset_cached: IsStatelessReset
+
+proc quicly_get_stream*(conn: ptr quicly_conn_t, stream_id: quicly_stream_id_t):
+                       ptr quicly_stream_t {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_close*(conn: ptr quicly_conn_t, err: cint, reason_phrase: cstring):
+                  cint {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_free*(conn: ptr quicly_conn_t): cint {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_decode_packet*(ctx: ptr quicly_context_t,
+                           packet: ptr quicly_decoded_packet_t,
+                           datagram: ptr uint8, datagram_size: csize_t,
+                           off: csize_t): csize_t
+                          {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_is_destination*(conn: ptr quicly_conn_t, dest_addr: ptr SockAddr,
+                            src_addr: ptr SockAddr,
+                            decoded: ptr quicly_decoded_packet_t): cint
+                           {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_receive*(conn: ptr quicly_conn_t, dest_addr: ptr SockAddr,
+                     src_addr: ptr SockAddr,
+                     packet: ptr quicly_decoded_packet_t): cint
+                    {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_accept*(conn: ptr ptr quicly_conn_t, ctx: ptr quicly_context_t,
+                    dest_addr: ptr SockAddr, src_addr: ptr SockAddr,
+                    packet: ptr quicly_decoded_packet_t,
+                    address_token: ptr quicly_address_token_plaintext_t,
+                    new_cid: ptr quicly_cid_plaintext_t,
+                    handshake_properties: ptr ptls_handshake_properties_t): cint
+                   {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_connect*(conn: ptr ptr quicly_conn_t, server_name: cstring,
+                     dest_addr: ptr SockAddr, src_addr: ptr SockAddr,
+                     new_cid: ptr quicly_cid_plaintext_t,
+                     address_token: ptr quicly_address_token_plaintext_t,
+                     handshake_properties: ptr ptls_handshake_properties_t,
+                     resumed_transport_params: ptr quicly_transport_parameters_t):
+                    cint {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_get_socklen*(sa: ptr SockAddr): SockLen
+                        {.cdecl, importc, header: "quicly.h".}
+
+proc quicly_get_fist_timeout*(conn: ptr quicly_conn_t): int64
+                             {.cdecl, importc, header: "quicly.h".}
diff --git a/quicly/ranges.nim b/quicly/ranges.nim
new file mode 100644
index 0000000..5b62c73
--- /dev/null
+++ b/quicly/ranges.nim
@@ -0,0 +1,10 @@
+type
+  quicly_range_t* {.importc, header: "quicly/ranges.h", bycopy.} = object
+    start*: uint64
+    `end`*: uint64
+
+  quicly_ranges_t* {.importc, header: "quicly/ranges.h", bycopy.} = object
+    ranges*: ptr quicly_range_t
+    num_ranges*: csize_t
+    capacity*: csize_t
+    initial*: quicly_range_t
diff --git a/quicly/recvstate.nim b/quicly/recvstate.nim
new file mode 100644
index 0000000..c16a3c0
--- /dev/null
+++ b/quicly/recvstate.nim
@@ -0,0 +1,10 @@
+from ranges import quicly_ranges_t
+
+type
+  quicly_recvstate_t* {.importc, header: "quicly/recvstate.h", bycopy.} = object
+    received*: quicly_ranges_t
+    data_off*: uint64
+    eos*: uint64
+
+proc quicly_recvstate_transfer_complete*(state: ptr quicly_recvstate_t): cint
+                                        {.cdecl, importc, header: "quicly/recvstate.h".}
diff --git a/quicly/sendstate.nim b/quicly/sendstate.nim
new file mode 100644
index 0000000..cc4252a
--- /dev/null
+++ b/quicly/sendstate.nim
@@ -0,0 +1,15 @@
+from ranges import quicly_ranges_t
+
+type
+  quicly_sendstate_t* {.importc, header: "quicly/sendstate.h", bycopy.} = object
+    acked*: quicly_ranges_t
+    pending*: quicly_ranges_t
+    size_inflight*: uint64
+    final_size*: uint64
+
+  quicly_sendstate_sent_t* {.importc, header: "quicly/sendstate.h", bycopy.} = object
+    start*: uint64
+    `end`*: uint64
+
+proc quicly_sendstate_is_open*(state: ptr quicly_sendstate_t): cint
+                              {.cdecl, importc, header: "quicly/sendstate.h".}
diff --git a/quicly/streambuf.nim b/quicly/streambuf.nim
new file mode 100644
index 0000000..b39c223
--- /dev/null
+++ b/quicly/streambuf.nim
@@ -0,0 +1,59 @@
+from ../picotls/picotls import ptls_buffer_t, ptls_iovec_t
+from constants import quicly_stream_t
+
+type
+  quicly_streambuf_sendvec_callbacks_t* {.importc, header: "quicly/streambuf.h", bycopy.} = object
+    flatten_vec*: proc(vec: ptr quicly_sendbuf_vec_t, dst: pointer, off: csize_t,
+                       len: csize_t): cint {.cdecl.}
+    discard_vec*: proc(vec: ptr quicly_sendbuf_vec_t) {.cdecl.}
+
+  quicly_sendbuf_vec_t* {.importc, header: "quicly/streambuf.h", bycopy.} = object
+    cb*: ptr quicly_streambuf_sendvec_callbacks_t
+    `len`*: csize_t
+    cbdata*: pointer
+
+  VecList* {.bycopy.} = object
+    entries*: ptr quicly_sendbuf_vec_t
+    size*: csize_t
+    capacity*: csize_t
+
+  quicly_sendbuf_t* {.importc, header: "quicly/streambuf.h", bycopy.} = object
+    vecs*: VecList
+    off_in_first_vec*: csize_t
+    bytes_written*: uint64
+
+  quicly_streambuf_t* {.importc, header: "quicly/streambuf.h", bycopy.} = object
+    egress*: quicly_sendbuf_t
+    ingress: ptls_buffer_t
+
+proc quicly_streambuf_create*(stream: ptr quicly_stream_t, sz: csize_t): cint
+                             {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_destroy*(stream: ptr quicly_stream_t, err: cint)
+                              {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_egress_shutdown*(stream: ptr quicly_stream_t): cint
+                                      {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_egress_write*(stream: ptr quicly_stream_t, src: pointer,
+                                    len: csize_t): cint
+                                   {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_egress_emit*(stream: ptr quicly_stream_t, off: csize_t,
+                                   dst: pointer, len: csize_t, wrote_all: cint)
+                                  {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_egress_shift*(stream: ptr quicly_stream_t, delta: csize_t)
+                                   {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_ingress_receive*(stream: ptr quicly_stream_t,
+                                       off: csize_t, src: pointer,
+                                       len: csize_t): cint
+                                      {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_ingress_get*(stream: ptr quicly_stream_t): ptls_iovec_t
+                                  {.cdecl, importc, header: "quicly/streambuf.h".}
+
+proc quicly_streambuf_ingress_shift*(stream: ptr quicly_stream_t,
+                                     delta: csize_t)
+                                    {.cdecl, importc, header: "quicly/streambuf.h".}
diff --git a/quicp2p.nim b/quicp2p.nim
new file mode 100644
index 0000000..d6ce673
--- /dev/null
+++ b/quicp2p.nim
@@ -0,0 +1,26 @@
+{.passL: "-l quicly -l picotls-core -l picotls-openssl".}
+
+import quicly/quicly
+import picotls/picotls
+import picotls/openssl
+
+proc main() =
+  echo "hello world"
+
+#type
+#  PtlsGetTime {.pure, final.} = pointer
+#
+#  PtlsContext {.importc: "struct ptls_context_t", pure, final,
+#                header: "picotls.h".} = object
+#    random_bytes: proc(buf: pointer, len: csize_t) {.cdecl.}
+#    get_time: ptr PtlsGetTime
+#    key_exchanges: ptr ptr PtlsKeyExchangeAlgorithm
+#    cipher_suites: ptr ptr PtlsCipherSuite
+#    certificates: 
+#
+#
+#  proc 
+#
+#
+#proc main() =
+#  ptlsContext =