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btstack/src/mesh/mesh_lower_transport.c
Matthias Ringwald 001c65e028 mesh: prefix mesh_node functions
2019-07-20 08:50:33 +02:00

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/*
* 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#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<<seg_o);
// last segment -> 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<<i)) == 0) return;
}
mesh_print_hex("Assembled payload", transport_pdu->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;
}
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