/* * Copyright (C) 2014 BlueKitchen GmbH * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the copyright holders nor the names of * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * 4. Any redistribution, use, or modification is done solely for * personal benefit and not for any commercial purpose or for * monetary gain. * * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * Please inquire about commercial licensing options at * contact@bluekitchen-gmbh.com * */ #define __BTSTACK_FILE__ "mesh_lower_transport.c" #include #include #include #include "btstack_util.h" #include "btstack_memory.h" #include "mesh/beacon.h" #include "mesh/mesh_node.h" #include "mesh_peer.h" #include "mesh_lower_transport.h" #include "mesh_iv_index_seq_number.h" static void (*higher_layer_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu); static void mesh_print_hex(const char * name, const uint8_t * data, uint16_t len){ printf("%-20s ", name); printf_hexdump(data, len); } // static void mesh_print_x(const char * name, uint32_t value){ // printf("%20s: 0x%x", name, (int) value); // } // utility // Transport PDU Getter uint16_t mesh_transport_nid(mesh_transport_pdu_t * transport_pdu){ return transport_pdu->network_header[0] & 0x7f; } uint16_t mesh_transport_ctl(mesh_transport_pdu_t * transport_pdu){ return transport_pdu->network_header[1] >> 7; } uint16_t mesh_transport_ttl(mesh_transport_pdu_t * transport_pdu){ return transport_pdu->network_header[1] & 0x7f; } uint32_t mesh_transport_seq(mesh_transport_pdu_t * transport_pdu){ return big_endian_read_24(transport_pdu->network_header, 2); } uint32_t mesh_transport_seq_zero(mesh_transport_pdu_t * transport_pdu){ return transport_pdu->seq_zero; } uint16_t mesh_transport_src(mesh_transport_pdu_t * transport_pdu){ return big_endian_read_16(transport_pdu->network_header, 5); } uint16_t mesh_transport_dst(mesh_transport_pdu_t * transport_pdu){ return big_endian_read_16(transport_pdu->network_header, 7); } void mesh_transport_set_nid_ivi(mesh_transport_pdu_t * transport_pdu, uint8_t nid_ivi){ transport_pdu->network_header[0] = nid_ivi; } void mesh_transport_set_ctl_ttl(mesh_transport_pdu_t * transport_pdu, uint8_t ctl_ttl){ transport_pdu->network_header[1] = ctl_ttl; } void mesh_transport_set_seq(mesh_transport_pdu_t * transport_pdu, uint32_t seq){ big_endian_store_24(transport_pdu->network_header, 2, seq); } void mesh_transport_set_src(mesh_transport_pdu_t * transport_pdu, uint16_t src){ big_endian_store_16(transport_pdu->network_header, 5, src); } void mesh_transport_set_dest(mesh_transport_pdu_t * transport_pdu, uint16_t dest){ big_endian_store_16(transport_pdu->network_header, 7, dest); } // lower transport // prototypes static void mesh_lower_transport_run(void); static void mesh_lower_transport_abort_transmission(void); // state static int lower_transport_retry_count; // lower transport incoming static btstack_linked_list_t lower_transport_incoming; // lower transport ougoing static btstack_linked_list_t lower_transport_outgoing; static mesh_transport_pdu_t * lower_transport_outgoing_pdu; static mesh_network_pdu_t * lower_transport_outgoing_segment; static uint16_t lower_transport_outgoing_seg_o; static void mesh_lower_transport_process_unsegmented_control_message(mesh_network_pdu_t *network_pdu){ uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); uint8_t opcode = lower_transport_pdu[0]; printf("Unsegmented Control message, outgoing message %p, opcode %x\n", lower_transport_outgoing_pdu, opcode); uint16_t seq_zero_pdu; uint16_t seq_zero_out; uint32_t block_ack; switch (opcode){ case 0: if (lower_transport_outgoing_pdu == NULL) break; seq_zero_pdu = big_endian_read_16(lower_transport_pdu, 1) >> 2; seq_zero_out = mesh_transport_seq(lower_transport_outgoing_pdu) & 0x1fff; block_ack = big_endian_read_32(lower_transport_pdu, 3); printf("[+] Segment Acknowledgment message with seq_zero %06x, block_ack %08x - outgoing seq %06x, block_ack %08x\n", seq_zero_pdu, block_ack, seq_zero_out, lower_transport_outgoing_pdu->block_ack); if (block_ack == 0){ // If a Segment Acknowledgment message with the BlockAck field set to 0x00000000 is received, // then the Upper Transport PDU shall be immediately cancelled and the higher layers shall be notified that // the Upper Transport PDU has been cancelled. printf("[+] Block Ack == 0 => Abort\n"); mesh_lower_transport_abort_transmission(); break; } if (seq_zero_pdu != seq_zero_out){ printf("[!] Seq Zero doesn't match\n"); break; } lower_transport_outgoing_pdu->block_ack &= ~block_ack; printf("[+] Updated block_ack %08x\n", lower_transport_outgoing_pdu->block_ack); if (lower_transport_outgoing_pdu->block_ack == 0){ printf("[+] Sent complete\n"); mesh_lower_transport_abort_transmission(); } mesh_network_message_processed_by_higher_layer(network_pdu); break; default: higher_layer_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) network_pdu); break; } } // ack / incomplete message static void mesh_lower_transport_setup_segmented_acknowledge_message(uint8_t * data, uint8_t obo, uint16_t seq_zero, uint32_t block_ack){ // printf("ACK Upper Transport, seq_zero %x\n", seq_zero); data[0] = 0; // SEG = 0, Opcode = 0 big_endian_store_16( data, 1, (obo << 15) | (seq_zero << 2) | 0); // OBO, SeqZero, RFU big_endian_store_32( data, 3, block_ack); mesh_print_hex("ACK Upper Transport", data, 7); } static void mesh_lower_transport_send_ack(uint16_t netkey_index, uint8_t ttl, uint16_t dest, uint16_t seq_zero, uint32_t block_ack){ // setup ack message uint8_t ack_msg[7]; mesh_lower_transport_setup_segmented_acknowledge_message(ack_msg, 0, seq_zero, block_ack); // // "3.4.5.2: The output filter of the interface connected to advertising or GATT bearers shall drop all messages with TTL value set to 1." // if (ttl <= 1) return 0; // TODO: check transport_pdu_len depending on ctl // lookup network by netkey_index const mesh_network_key_t * network_key = mesh_network_key_list_get(netkey_index); if (!network_key) return; // allocate network_pdu mesh_network_pdu_t * network_pdu = mesh_network_pdu_get(); if (!network_pdu) return; // setup network_pdu mesh_network_setup_pdu(network_pdu, netkey_index, network_key->nid, 1, ttl, mesh_sequence_number_next(), mesh_node_get_primary_element_address(), dest, ack_msg, sizeof(ack_msg)); // send network_pdu mesh_network_send_pdu(network_pdu); } static void mesh_lower_transport_send_ack_for_transport_pdu(mesh_transport_pdu_t *transport_pdu){ uint16_t seq_zero = mesh_transport_seq_zero(transport_pdu); uint8_t ttl = mesh_transport_ttl(transport_pdu); uint16_t dest = mesh_transport_src(transport_pdu); uint16_t netkey_index = transport_pdu->netkey_index; printf("mesh_transport_send_ack_for_transport_pdu %p with netkey_index %x, TTL = %u, SeqZero = %x, SRC = %x, DST = %x\n", transport_pdu, netkey_index, ttl, seq_zero, mesh_node_get_primary_element_address(), dest); mesh_lower_transport_send_ack(netkey_index, ttl, dest, seq_zero, transport_pdu->block_ack); } static void mesh_lower_transport_send_ack_for_network_pdu(mesh_network_pdu_t *network_pdu, uint16_t seq_zero, uint32_t block_ack) { uint8_t ttl = mesh_network_ttl(network_pdu); uint16_t dest = mesh_network_src(network_pdu); uint16_t netkey_index = network_pdu->netkey_index; printf("mesh_transport_send_ack_for_network_pdu %p with netkey_index %x, TTL = %u, SeqZero = %x, SRC = %x, DST = %x\n", network_pdu, netkey_index, ttl, seq_zero, mesh_node_get_primary_element_address(), dest); mesh_lower_transport_send_ack(netkey_index, ttl, dest, seq_zero, block_ack); } static void mesh_lower_transport_stop_acknowledgment_timer(mesh_transport_pdu_t *transport_pdu){ if (!transport_pdu->acknowledgement_timer_active) return; transport_pdu->acknowledgement_timer_active = 0; btstack_run_loop_remove_timer(&transport_pdu->acknowledgement_timer); } static void mesh_lower_transport_stop_incomplete_timer(mesh_transport_pdu_t *transport_pdu){ if (!transport_pdu->incomplete_timer_active) return; transport_pdu->incomplete_timer_active = 0; btstack_run_loop_remove_timer(&transport_pdu->incomplete_timer); } // stops timers and updates reassembly engine static void mesh_lower_transport_segmented_message_complete(mesh_transport_pdu_t *transport_pdu){ // set flag transport_pdu->message_complete = 1; // stop timers mesh_lower_transport_stop_acknowledgment_timer(transport_pdu); mesh_lower_transport_stop_incomplete_timer(transport_pdu); // stop reassembly mesh_peer_t * peer = mesh_peer_for_addr(mesh_transport_src(transport_pdu)); if (peer){ peer->transport_pdu = NULL; } } static void mesh_lower_transport_rx_ack_timeout(btstack_timer_source_t *ts){ mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) btstack_run_loop_get_timer_context(ts); printf("ACK: acknowledgement timer fired for %p, send ACK\n", transport_pdu); transport_pdu->acknowledgement_timer_active = 0; mesh_lower_transport_send_ack_for_transport_pdu(transport_pdu); } static void mesh_lower_transport_rx_incomplete_timeout(btstack_timer_source_t *ts){ mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) btstack_run_loop_get_timer_context(ts); printf("mesh_transport_rx_incomplete_timeout for %p - give up\n", transport_pdu); mesh_lower_transport_segmented_message_complete(transport_pdu); // free message btstack_memory_mesh_transport_pdu_free(transport_pdu); } static void mesh_lower_transport_start_acknowledgment_timer(mesh_transport_pdu_t *transport_pdu, uint32_t timeout, void (*callback)(btstack_timer_source_t *ts)){ printf("ACK: start ack timer for %p, timeout %u ms\n", transport_pdu, (int) timeout); btstack_run_loop_set_timer(&transport_pdu->acknowledgement_timer, timeout); btstack_run_loop_set_timer_handler(&transport_pdu->acknowledgement_timer, callback); btstack_run_loop_set_timer_context(&transport_pdu->acknowledgement_timer, transport_pdu); btstack_run_loop_add_timer(&transport_pdu->acknowledgement_timer); transport_pdu->acknowledgement_timer_active = 1; } static void mesh_lower_transport_restart_incomplete_timer(mesh_transport_pdu_t *transport_pdu, uint32_t timeout, void (*callback)(btstack_timer_source_t *ts)){ printf("RX-(re)start incomplete timer for %p, timeout %u ms\n", transport_pdu, (int) timeout); if (transport_pdu->incomplete_timer_active){ btstack_run_loop_remove_timer(&transport_pdu->incomplete_timer); } btstack_run_loop_set_timer(&transport_pdu->incomplete_timer, timeout); btstack_run_loop_set_timer_handler(&transport_pdu->incomplete_timer, callback); btstack_run_loop_set_timer_context(&transport_pdu->incomplete_timer, transport_pdu); btstack_run_loop_add_timer(&transport_pdu->incomplete_timer); transport_pdu->incomplete_timer_active = 1; } static void mesh_lower_transport_outgoing_complete(void){ mesh_transport_pdu_t * pdu = lower_transport_outgoing_pdu; lower_transport_outgoing_pdu = NULL; higher_layer_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SEND_ABORT_BY_REMOTE, (mesh_pdu_t *) pdu); } static void mesh_lower_transport_abort_transmission(void){ // stop ack timers mesh_lower_transport_stop_acknowledgment_timer(lower_transport_outgoing_pdu); // notify upper transport mesh_lower_transport_outgoing_complete(); } static mesh_transport_pdu_t * mesh_lower_transport_pdu_for_segmented_message(mesh_network_pdu_t *network_pdu){ uint16_t src = mesh_network_src(network_pdu); uint16_t seq_zero = ( big_endian_read_16(mesh_network_pdu_data(network_pdu), 1) >> 2) & 0x1fff; printf("mesh_transport_pdu_for_segmented_message: seq_zero %x\n", seq_zero); mesh_peer_t * peer = mesh_peer_for_addr(src); if (!peer) { return NULL; } printf("mesh_seq_zero_validate(%x, %x) -- last (%x, %x)\n", src, seq_zero, peer->address, peer->seq_zero); // reception of transport message ongoing if (peer->transport_pdu){ // check if segment for same seq zero uint16_t active_seq_zero = mesh_transport_seq_zero(peer->transport_pdu); if (active_seq_zero == seq_zero) { printf("mesh_transport_pdu_for_segmented_message: segment for current transport pdu with SeqZero %x\n", active_seq_zero); return peer->transport_pdu; } else { // seq zero differs from current transport pdu, but current pdu is not complete printf("mesh_transport_pdu_for_segmented_message: drop segment. current transport pdu SeqZero %x, now %x\n", active_seq_zero, seq_zero); return NULL; } } // send ACK if segment for previously completed transport pdu (no ongoing reception, block ack is cleared) if ((seq_zero == peer->seq_zero) && (peer->block_ack != 0)){ printf("mesh_transport_pdu_for_segmented_message: segment for last completed message. send ack\n"); mesh_lower_transport_send_ack_for_network_pdu(network_pdu, seq_zero, peer->block_ack); return NULL; } // reconstruct lowest 24 bit of SeqAuth uint32_t seq = mesh_network_seq(network_pdu); uint32_t seq_auth = (seq & 0xffe000) | seq_zero; if (seq_auth > seq){ seq_auth -= 0x2000; } // no transport pdu active, check new message: seq auth is greater OR seq auth is same but no segments if (seq_auth > peer->seq_auth || (seq_auth == peer->seq_auth && peer->block_ack == 0)){ mesh_transport_pdu_t * pdu = mesh_transport_pdu_get(); if (!pdu) return NULL; // cache network pdu header memcpy(pdu->network_header, network_pdu->data, 9); // store lower 24 bit of SeqAuth for App / Device Nonce big_endian_store_24(pdu->network_header, 2, seq_auth); // store meta data in new pdu pdu->netkey_index = network_pdu->netkey_index; pdu->block_ack = 0; pdu->acknowledgement_timer_active = 0; pdu->message_complete = 0; pdu->seq_zero = seq_zero; // update peer info peer->transport_pdu = pdu; peer->seq_zero = seq_zero; peer->seq_auth = seq_auth; peer->block_ack = 0; printf("mesh_transport_pdu_for_segmented_message: setup transport pdu %p for src %x, seq %06x, seq_zero %x\n", pdu, src, mesh_transport_seq(pdu), seq_zero); return peer->transport_pdu; } else { // seq zero differs from current transport pdu printf("mesh_transport_pdu_for_segmented_message: drop segment for old seq %x\n", seq_zero); return NULL; } } static void mesh_lower_transport_process_segment( mesh_transport_pdu_t * transport_pdu, mesh_network_pdu_t * network_pdu){ uint8_t * lower_transport_pdu = mesh_network_pdu_data(network_pdu); uint8_t lower_transport_pdu_len = mesh_network_pdu_len(network_pdu); // get akf_aid & transmic transport_pdu->akf_aid = lower_transport_pdu[0]; transport_pdu->transmic_len = lower_transport_pdu[1] & 0x80 ? 8 : 4; // get seq_zero uint16_t seq_zero = ( big_endian_read_16(lower_transport_pdu, 1) >> 2) & 0x1fff; // get seg fields uint8_t seg_o = ( big_endian_read_16(lower_transport_pdu, 2) >> 5) & 0x001f; uint8_t seg_n = lower_transport_pdu[3] & 0x1f; uint8_t segment_len = lower_transport_pdu_len - 4; uint8_t * segment_data = &lower_transport_pdu[4]; printf("mesh_lower_transport_process_segment: seq zero %04x, seg_o %02x, seg_n %02x, transmic len: %u\n", seq_zero, seg_o, seg_n, transport_pdu->transmic_len * 8); mesh_print_hex("Segment", segment_data, segment_len); // store segment memcpy(&transport_pdu->data[seg_o * 12], segment_data, 12); // mark as received transport_pdu->block_ack |= (1< store len if (seg_o == seg_n){ transport_pdu->len = (seg_n * 12) + segment_len; printf("Assembled payload len %u\n", transport_pdu->len); } // check for complete int i; for (i=0;i<=seg_n;i++){ if ( (transport_pdu->block_ack & (1<data, transport_pdu->len); // mark as done mesh_lower_transport_segmented_message_complete(transport_pdu); // store block ack in peer info mesh_peer_t * peer = mesh_peer_for_addr(mesh_transport_src(transport_pdu)); // TODO: check if NULL check can be removed if (peer){ peer->block_ack = transport_pdu->block_ack; } // send ack mesh_lower_transport_send_ack_for_transport_pdu(transport_pdu); // forward to upper transport higher_layer_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t*) transport_pdu); } void mesh_lower_transport_message_processed_by_higher_layer(mesh_pdu_t * pdu){ switch (pdu->pdu_type){ case MESH_PDU_TYPE_NETWORK: mesh_network_message_processed_by_higher_layer((mesh_network_pdu_t *) pdu); break; case MESH_PDU_TYPE_TRANSPORT: mesh_transport_pdu_free((mesh_transport_pdu_t *) pdu); break; default: break; } } static void mesh_lower_transport_network_pdu_sent(mesh_network_pdu_t *network_pdu); static void mesh_lower_transport_tx_ack_timeout(btstack_timer_source_t * ts); void mesh_lower_transport_received_message(mesh_network_callback_type_t callback_type, mesh_network_pdu_t *network_pdu){ mesh_peer_t * peer; uint16_t src; uint16_t seq; switch (callback_type){ case MESH_NETWORK_PDU_RECEIVED: src = mesh_network_src(network_pdu); seq = mesh_network_seq(network_pdu); peer = mesh_peer_for_addr(src); printf("Transport: received message. SRC %x, SEQ %x\n", src, seq); // validate seq if (peer && seq > peer->seq){ // track seq peer->seq = seq; // add to list and go btstack_linked_list_add_tail(&lower_transport_incoming, (btstack_linked_item_t *) network_pdu); mesh_lower_transport_run(); } else { // drop packet printf("Transport: drop packet - src/seq auth failed\n"); mesh_network_message_processed_by_higher_layer(network_pdu); } break; case MESH_NETWORK_PDU_SENT: mesh_lower_transport_network_pdu_sent(network_pdu); break; default: break; } } static void mesh_lower_transport_setup_segment(mesh_transport_pdu_t *transport_pdu, uint8_t seg_o, mesh_network_pdu_t *network_pdu){ int ctl = mesh_transport_ctl(transport_pdu); uint16_t max_segment_len = ctl ? 8 : 12; // control 8 bytes (64 bit NetMic), access 12 bytes (32 bit NetMIC) uint32_t seq = mesh_sequence_number_next(); uint16_t seq_zero = mesh_transport_seq(transport_pdu) & 0x01fff; uint8_t seg_n = (transport_pdu->len - 1) / max_segment_len; uint8_t szmic = ((!ctl) && (transport_pdu->transmic_len == 8)) ? 1 : 0; // only 1 for access messages with 64 bit TransMIC uint8_t nid = mesh_transport_nid(transport_pdu); uint8_t ttl = mesh_transport_ttl(transport_pdu); uint16_t src = mesh_transport_src(transport_pdu); uint16_t dest = mesh_transport_dst(transport_pdu); // current segment. uint16_t seg_offset = seg_o * max_segment_len; uint8_t lower_transport_pdu_data[16]; lower_transport_pdu_data[0] = 0x80 | transport_pdu->akf_aid; big_endian_store_24(lower_transport_pdu_data, 1, (szmic << 23) | (seq_zero << 10) | (seg_o << 5) | seg_n); uint16_t segment_len = btstack_min(transport_pdu->len - seg_offset, max_segment_len); memcpy(&lower_transport_pdu_data[4], &transport_pdu->data[seg_offset], segment_len); uint16_t lower_transport_pdu_len = 4 + segment_len; mesh_network_setup_pdu(network_pdu, transport_pdu->netkey_index, nid, 0, ttl, seq, src, dest, lower_transport_pdu_data, lower_transport_pdu_len); } static void mesh_lower_transport_send_next_segment(void){ if (!lower_transport_outgoing_pdu) return; int ctl = mesh_transport_ctl(lower_transport_outgoing_pdu); uint16_t max_segment_len = ctl ? 8 : 12; // control 8 bytes (64 bit NetMic), access 12 bytes (32 bit NetMIC) uint8_t seg_n = (lower_transport_outgoing_pdu->len - 1) / max_segment_len; // find next unacknowledged segement while ((lower_transport_outgoing_seg_o <= seg_n) && ((lower_transport_outgoing_pdu->block_ack & (1 << lower_transport_outgoing_seg_o)) == 0)){ lower_transport_outgoing_seg_o++; } if (lower_transport_outgoing_seg_o > seg_n){ printf("[+] Lower Transport, send segmented pdu complete (dst %x)\n", mesh_transport_dst(lower_transport_outgoing_pdu)); lower_transport_outgoing_seg_o = 0; // done for unicast, ack timer already set, too if (mesh_network_address_unicast(mesh_transport_dst(lower_transport_outgoing_pdu))) return; // done, more? if (lower_transport_retry_count == 0){ printf("[+] Lower Transport, message unacknowledged -> free\n"); // notify upper transport mesh_lower_transport_outgoing_complete(); return; } // start retry printf("[+] Lower Transport, message unacknowledged retry count %u\n", lower_transport_retry_count); lower_transport_retry_count--; } if (mesh_network_address_unicast(mesh_transport_dst(lower_transport_outgoing_pdu))){ // restart acknowledgment timer for unicast dst // - "This timer shall be set to a minimum of 200 + 50 * TTL milliseconds." if (lower_transport_outgoing_pdu->acknowledgement_timer_active){ btstack_run_loop_remove_timer(&lower_transport_outgoing_pdu->incomplete_timer); lower_transport_outgoing_pdu->acknowledgement_timer_active = 0; } uint32_t timeout = 200 + 50 * mesh_transport_ttl(lower_transport_outgoing_pdu); mesh_lower_transport_start_acknowledgment_timer(lower_transport_outgoing_pdu, timeout, &mesh_lower_transport_tx_ack_timeout); } mesh_lower_transport_setup_segment(lower_transport_outgoing_pdu, lower_transport_outgoing_seg_o, lower_transport_outgoing_segment); printf("[+] Lower Transport, send segmented pdu: seg_o %x, seg_n %x\n", lower_transport_outgoing_seg_o, seg_n); mesh_print_hex("LowerTransportPDU", lower_transport_outgoing_segment->data, lower_transport_outgoing_segment->len); // next segment lower_transport_outgoing_seg_o++; // send network pdu mesh_network_send_pdu(lower_transport_outgoing_segment); } static void mesh_lower_transport_network_pdu_sent(mesh_network_pdu_t *network_pdu){ // figure out what pdu was sent // single segment of segmented message? if (lower_transport_outgoing_segment == network_pdu){ mesh_lower_transport_send_next_segment(); return; } // Segment Acknowledgment message sent by us? if (mesh_network_control(network_pdu) && network_pdu->data[0] == 0){ btstack_memory_mesh_network_pdu_free(network_pdu); return; } // other higher_layer_handler(MESH_TRANSPORT_PDU_SENT, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) network_pdu); } static void mesh_lower_transport_send_segmented_pdu_once(mesh_transport_pdu_t *transport_pdu){ if (lower_transport_retry_count == 0){ printf("[!] Upper transport, send segmented pdu failed, retries exhausted\n"); mesh_lower_transport_outgoing_complete(); return; } // chop into chunks printf("[+] Lower Transport, send segmented pdu (retry count %u)\n", lower_transport_retry_count); lower_transport_retry_count--; // setup lower_transport_outgoing_pdu = transport_pdu; lower_transport_outgoing_seg_o = 0; // setup block ack - set bit for segment to send, clear on ack int ctl = mesh_transport_ctl(lower_transport_outgoing_pdu); uint16_t max_segment_len = ctl ? 8 : 12; // control 8 bytes (64 bit NetMic), access 12 bytes (32 bit NetMIC) uint8_t seg_n = (lower_transport_outgoing_pdu->len - 1) / max_segment_len; if (seg_n < 31){ transport_pdu->block_ack = (1 << (seg_n+1)) - 1; } else { transport_pdu->block_ack = 0xffffffff; } // start sending mesh_lower_transport_send_next_segment(); } void mesh_lower_transport_send_pdu(mesh_pdu_t *pdu){ btstack_linked_list_add_tail(&lower_transport_outgoing, (btstack_linked_item_t*) pdu); mesh_lower_transport_run(); } static void mesh_lower_transport_tx_ack_timeout(btstack_timer_source_t * ts){ mesh_transport_pdu_t * transport_pdu = (mesh_transport_pdu_t *) btstack_run_loop_get_timer_context(ts); printf("[+] Lower transport, acknowledgement timer fired for %p\n", transport_pdu); transport_pdu->acknowledgement_timer_active = 0; // send remaining segments again mesh_lower_transport_send_segmented_pdu_once(transport_pdu); } static void mesh_lower_transport_run(void){ while(!btstack_linked_list_empty(&lower_transport_incoming)){ // get next message mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(&lower_transport_incoming); // segmented? if (mesh_network_segmented(network_pdu)){ mesh_transport_pdu_t * transport_pdu = mesh_lower_transport_pdu_for_segmented_message(network_pdu); if (!transport_pdu) return; // start acknowledgment timer if inactive if (transport_pdu->acknowledgement_timer_active == 0){ // - "The acknowledgment timer shall be set to a minimum of 150 + 50 * TTL milliseconds" uint32_t timeout = 150 + 50 * mesh_network_ttl(network_pdu); mesh_lower_transport_start_acknowledgment_timer(transport_pdu, timeout, &mesh_lower_transport_rx_ack_timeout); } // restart incomplete timer mesh_lower_transport_restart_incomplete_timer(transport_pdu, 10000, &mesh_lower_transport_rx_incomplete_timeout); mesh_lower_transport_process_segment(transport_pdu, network_pdu); mesh_network_message_processed_by_higher_layer(network_pdu); } else { // control? if (mesh_network_control(network_pdu)){ // unsegmented control message (not encrypted) mesh_lower_transport_process_unsegmented_control_message(network_pdu); } else { // unsegmented access message (encrypted) higher_layer_handler(MESH_TRANSPORT_PDU_RECEIVED, MESH_TRANSPORT_STATUS_SUCCESS, (mesh_pdu_t *) network_pdu); } } } // check if outgoing segmented pdu is active if (lower_transport_outgoing_pdu) return; while(!btstack_linked_list_empty(&lower_transport_outgoing)) { // get next message mesh_transport_pdu_t * transport_pdu; mesh_network_pdu_t * network_pdu; mesh_pdu_t * pdu = (mesh_pdu_t *) btstack_linked_list_pop(&lower_transport_outgoing); switch (pdu->pdu_type) { case MESH_PDU_TYPE_NETWORK: network_pdu = (mesh_network_pdu_t *) pdu; mesh_network_send_pdu(network_pdu); break; case MESH_PDU_TYPE_TRANSPORT: transport_pdu = (mesh_transport_pdu_t *) pdu; // start sending segmented pdu lower_transport_retry_count = 2; mesh_lower_transport_send_segmented_pdu_once(transport_pdu); break; default: break; } } } static void mesh_lower_transport_dump_network_pdus(const char *name, btstack_linked_list_t *list){ printf("List: %s:\n", name); btstack_linked_list_iterator_t it; btstack_linked_list_iterator_init(&it, list); while (btstack_linked_list_iterator_has_next(&it)){ mesh_network_pdu_t * network_pdu = (mesh_network_pdu_t*) btstack_linked_list_iterator_next(&it); printf("- %p: ", network_pdu); printf_hexdump(network_pdu->data, network_pdu->len); } } static void mesh_lower_transport_reset_network_pdus(btstack_linked_list_t *list){ while (!btstack_linked_list_empty(list)){ mesh_network_pdu_t * pdu = (mesh_network_pdu_t *) btstack_linked_list_pop(list); btstack_memory_mesh_network_pdu_free(pdu); } } void mesh_lower_transport_dump(void){ // static btstack_linked_list_t upper_transport_control; // static btstack_linked_list_t upper_transport_access; mesh_lower_transport_dump_network_pdus("lower_transport_incoming", &lower_transport_incoming); } void mesh_lower_transport_reset(void){ // static btstack_linked_list_t upper_transport_control; // static btstack_linked_list_t upper_transport_access; mesh_lower_transport_reset_network_pdus(&lower_transport_incoming); if (lower_transport_outgoing_pdu){ mesh_transport_pdu_free(lower_transport_outgoing_pdu); lower_transport_outgoing_pdu = NULL; } } void mesh_lower_transport_init(){ // register with network layer mesh_network_set_higher_layer_handler(&mesh_lower_transport_received_message); // allocate network_pdu for segmentation lower_transport_outgoing_segment = mesh_network_pdu_get(); } void mesh_lower_transport_set_higher_layer_handler(void (*pdu_handler)( mesh_transport_callback_type_t callback_type, mesh_transport_status_t status, mesh_pdu_t * pdu)){ higher_layer_handler = pdu_handler; }