/*
* 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
*
*/
// *****************************************************************************
//
// Minimal setup for HSP Headset (!! UNDER DEVELOPMENT !!)
//
// *****************************************************************************
#include "btstack-config.h"
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <btstack/hci_cmds.h>
#include <btstack/run_loop.h>
#include "hci.h"
#include "btstack_memory.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "sdp_query_rfcomm.h"
#include "sdp.h"
#include "debug.h"
#define RFCOMM_SERVER_CHANNEL 1
#define HSP_HS_BUTTON_PRESS "AT+CKPD=200\r"
#define HSP_HS_AT_CKPD "AT+CKPD\r"
#define HSP_AG_OK "\r\nOK\r\n"
#define HSP_AG_ERROR "\r\nERROR\r\n"
#define HSP_AG_RING "\r\nRING\r\n"
#define HSP_MICROPHONE_GAIN "+VGM"
#define HSP_SPEAKER_GAIN "+VGS"
#define HSP_HS_MICROPHONE_GAIN "AT+VGM="
#define HSP_HS_SPEAKER_GAIN "AT+VGS="
static const char default_hsp_hs_service_name[] = "Headset";
static bd_addr_t remote = {0x04, 0x0C, 0xCE, 0xE4, 0x85, 0xD3};
static uint8_t channel_nr = 0;
static uint16_t mtu;
static uint16_t rfcomm_cid = 0;
static uint16_t sco_handle = 0;
static uint16_t rfcomm_handle = 0;
// static uint8_t connection_state = 0;
static int hs_microphone_gain = -1;
static int hs_speaker_gain = -1;
static uint8_t hs_send_button_press = 0;
static uint8_t hs_send_at_cpkd = 0;
static uint8_t hs_ok_received = 0;
static uint8_t hs_ring_received = 0;
static uint8_t hsp_service_buffer[150];
typedef enum {
HSP_IDLE,
HSP_SDP_QUERY_RFCOMM_CHANNEL,
HSP_W4_SDP_QUERY_COMPLETE,
HSP_W4_RFCOMM_CONNECTED,
HSP_W2_CONNECT_SCO,
HSP_W4_SCO_CONNECTED,
HSP_ACTIVE,
HSP_W2_DISCONNECT_SCO,
HSP_W4_SCO_DISCONNECTED,
HSP_W2_DISCONNECT_RFCOMM,
HSP_W4_RFCOMM_DISCONNECTED,
HSP_W4_CONNECTION_ESTABLISHED_TO_SHUTDOWN
} hsp_state_t;
static hsp_state_t hsp_state = HSP_IDLE;
static void hsp_run();
// remote audio volume control
// AG +VGM=13 [0..15] ; HS AT+VGM=6 | AG OK
static int send_str_over_rfcomm(uint16_t cid, char * command){
if (!rfcomm_can_send_packet_now(rfcomm_cid)) return 1;
int err = rfcomm_send_internal(cid, (uint8_t*) command, strlen(command));
if (err){
printf("rfcomm_send_internal -> error 0X%02x", err);
}
return err;
}
void hsp_hs_init(){
hsp_state = HSP_IDLE;
rfcomm_cid = 0;
rfcomm_handle = 0;
sco_handle = 0;
hs_microphone_gain = -1;
hs_speaker_gain = -1;
hs_send_button_press = 0;
hs_send_at_cpkd = 0;
hs_ok_received = 0;
hs_ring_received = 0;
// TODO
}
void hsp_hs_connect(bd_addr_t bd_addr){
if (hsp_state != HSP_IDLE) return;
hsp_state = HSP_SDP_QUERY_RFCOMM_CHANNEL;
memcpy(remote, bd_addr, 6);
hsp_run();
}
void hsp_hs_disconnect(bd_addr_t bd_addr){
switch (hsp_state){
case HSP_ACTIVE:
hsp_state = HSP_W2_DISCONNECT_SCO;
hs_send_at_cpkd = 1;
break;
case HSP_W4_RFCOMM_CONNECTED:
hsp_state = HSP_W4_CONNECTION_ESTABLISHED_TO_SHUTDOWN;
break;
default:
return;
}
hsp_run();
}
void hsp_hs_set_microphone_gain(uint8_t gain){
if (gain < 0 || gain >15) {
printf("Gain must be in interval [0..15], it is given %d\n", gain);
return;
}
hs_microphone_gain = gain;
hsp_run();
}
// AG +VGS=5 [0..15] ; HS AT+VGM=6 | AG OK
void hsp_hs_set_speaker_gain(uint8_t gain){
if (gain < 0 || gain >15) {
printf("Gain must be in interval [0..15], it is given %d\n", gain);
return;
}
hs_speaker_gain = gain;
hsp_run();
}
static void hsp_run(){
int err;
if (hs_ring_received){
hs_ring_received = 0;
hs_send_button_press = 1;
}
if (hs_send_at_cpkd){
int err = send_str_over_rfcomm(rfcomm_cid, HSP_HS_AT_CKPD);
if (!err) hs_send_at_cpkd = 0;
return;
}
if (hs_send_button_press){
int err = send_str_over_rfcomm(rfcomm_cid, HSP_HS_BUTTON_PRESS);
if (!err) hs_send_button_press = 0;
return;
}
switch (hsp_state){
case HSP_SDP_QUERY_RFCOMM_CHANNEL:
hsp_state = HSP_W4_SDP_QUERY_COMPLETE;
sdp_query_rfcomm_channel_and_name_for_uuid(remote, SDP_Headset_AG);
break;
case HSP_W2_CONNECT_SCO:
if (hs_ok_received){
hs_ok_received = 0;
hsp_state = HSP_W4_SCO_CONNECTED;
}
break;
case HSP_W2_DISCONNECT_SCO:
if (hs_ok_received){
hs_ok_received = 0;
hsp_state = HSP_W4_SCO_DISCONNECTED;
}
break;
case HSP_ACTIVE:
if (hs_microphone_gain >= 0){
char buffer[10];
sprintf(buffer, "%s=%d\r", HSP_HS_MICROPHONE_GAIN, hs_microphone_gain);
err = send_str_over_rfcomm(rfcomm_cid, buffer);
if (!err) hs_microphone_gain = -1;
break;
}
if (hs_speaker_gain >= 0){
char buffer[10];
sprintf(buffer, "%s=%d\r", HSP_HS_SPEAKER_GAIN, hs_speaker_gain);
err = send_str_over_rfcomm(rfcomm_cid, buffer);
if (!err) hs_speaker_gain = -1;
break;
}
break;
default:
break;
}
}
static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
// printf("packet_handler type %u, packet[0] %x\n", packet_type, packet[0]);
if (packet_type == RFCOMM_DATA_PACKET){
if (strncmp((char *)packet, HSP_AG_RING, strlen(HSP_AG_RING)) == 0){
printf("Received RING %s\n", HSP_AG_RING);
hs_ring_received = 1;
} if (strncmp((char *)packet, HSP_AG_OK, strlen(HSP_AG_OK)) == 0){
printf("Received OK %s\n", HSP_AG_OK);
hs_ok_received = 1;
} else if (strncmp((char *)packet, HSP_MICROPHONE_GAIN, strlen(HSP_MICROPHONE_GAIN)) == 0 ||
strncmp((char *)packet, HSP_SPEAKER_GAIN, strlen(HSP_SPEAKER_GAIN)) == 0){
printf("Received changed gain info %c\n", packet[8]);
} else {
log_info("Received not yet supported command.\n");
}
hsp_run();
return;
}
if (packet_type != HCI_EVENT_PACKET) return;
uint8_t event = packet[0];
bd_addr_t event_addr;
uint16_t handle;
switch (event) {
case BTSTACK_EVENT_STATE:
// bt stack activated, get started
if (packet[2] == HCI_STATE_WORKING){
hsp_hs_connect(remote);
}
break;
case HCI_EVENT_PIN_CODE_REQUEST:
// inform about pin code request
printf("Pin code request - using '0000'\n\r");
bt_flip_addr(event_addr, &packet[2]);
hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
break;
case HCI_EVENT_SYNCHRONOUS_CONNECTION_COMPLETE:{
int index = 2;
uint8_t status = packet[index++];
sco_handle = READ_BT_16(packet, index);
index+=2;
bd_addr_t address;
memcpy(address, &packet[index], 6);
index+=6;
uint8_t link_type = packet[index++];
uint8_t transmission_interval = packet[index++]; // measured in slots
uint8_t retransmission_interval = packet[index++];// measured in slots
uint16_t rx_packet_length = READ_BT_16(packet, index); // measured in bytes
index+=2;
uint16_t tx_packet_length = READ_BT_16(packet, index); // measured in bytes
index+=2;
uint8_t air_mode = packet[index];
if (status != 0){
log_error("(e)SCO Connection is not established, status %u", status);
exit(0);
break;
}
switch (link_type){
case 0x00:
printf("SCO Connection established. \n");
if (transmission_interval != 0) log_error("SCO Connection: transmission_interval not zero: %d.", transmission_interval);
if (retransmission_interval != 0) log_error("SCO Connection: retransmission_interval not zero: %d.", retransmission_interval);
if (rx_packet_length != 0) log_error("SCO Connection: rx_packet_length not zero: %d.", rx_packet_length);
if (tx_packet_length != 0) log_error("SCO Connection: tx_packet_length not zero: %d.", tx_packet_length);
break;
case 0x02:
printf("eSCO Connection established. \n");
break;
default:
log_error("(e)SCO reserved link_type 0x%2x", link_type);
break;
}
log_info("sco_handle 0x%2x, address %s, transmission_interval %u slots, retransmission_interval %u slots, "
" rx_packet_length %u bytes, tx_packet_length %u bytes, air_mode 0x%2x (0x02 == CVSD)", sco_handle,
bd_addr_to_str(address), transmission_interval, retransmission_interval, rx_packet_length, tx_packet_length, air_mode);
if (hsp_state == HSP_W4_CONNECTION_ESTABLISHED_TO_SHUTDOWN){
hsp_state = HSP_W2_DISCONNECT_SCO;
break;
}
hsp_state = HSP_ACTIVE;
break;
}
case RFCOMM_EVENT_INCOMING_CONNECTION:
// data: event (8), len(8), address(48), channel (8), rfcomm_cid (16)
if (hsp_state != HSP_IDLE) return;
bt_flip_addr(event_addr, &packet[2]);
rfcomm_cid = READ_BT_16(packet, 9);
printf("RFCOMM channel %u requested for %s\n", packet[8], bd_addr_to_str(event_addr));
rfcomm_accept_connection_internal(rfcomm_cid);
hsp_state = HSP_W2_CONNECT_SCO;
hs_send_button_press = 1;
break;
case RFCOMM_EVENT_OPEN_CHANNEL_COMPLETE:
printf("RFCOMM_EVENT_OPEN_CHANNEL_COMPLETE packet_handler type %u, packet[0] %x\n", packet_type, packet[0]);
// data: event(8), len(8), status (8), address (48), handle(16), server channel(8), rfcomm_cid(16), max frame size(16)
if (packet[2]) {
printf("RFCOMM channel open failed, status %u\n", packet[2]);
hsp_state = HSP_IDLE;
} else {
// data: event(8) , len(8), status (8), address (48), handle (16), server channel(8), rfcomm_cid(16), max frame size(16)
rfcomm_handle = READ_BT_16(packet, 9);
rfcomm_cid = READ_BT_16(packet, 12);
mtu = READ_BT_16(packet, 14);
printf("RFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n", rfcomm_cid, mtu);
switch (hsp_state){
case HSP_W4_RFCOMM_CONNECTED:
hsp_state = HSP_W2_CONNECT_SCO;
hs_send_at_cpkd = 1;
break;
case HSP_W4_CONNECTION_ESTABLISHED_TO_SHUTDOWN:
hsp_state = HSP_W2_DISCONNECT_RFCOMM;
break;
default:
break;
}
}
break;
case DAEMON_EVENT_HCI_PACKET_SENT:
case RFCOMM_EVENT_CREDITS:
if (!rfcomm_cid) {
hsp_state = HSP_IDLE;
hsp_hs_init();
}
break;
case HCI_EVENT_DISCONNECTION_COMPLETE:
if (hsp_state != HSP_W4_SCO_DISCONNECTED){
log_info("received gap disconnect in wrong hsp state");
}
handle = READ_BT_16(packet,3);
if (handle == sco_handle){
sco_handle = 0;
hsp_state = HSP_W4_RFCOMM_DISCONNECTED;
break;
}
break;
case RFCOMM_EVENT_CHANNEL_CLOSED:
if (hsp_state != HSP_W4_RFCOMM_DISCONNECTED){
log_info("received RFCOMM disconnect in wrong hsp state");
}
printf("RFCOMM channel closed\n");
hsp_state = HSP_IDLE;
hsp_hs_init();
break;
default:
break;
}
hsp_run();
}
void handle_query_rfcomm_event(sdp_query_event_t * event, void * context){
sdp_query_rfcomm_service_event_t * ve;
sdp_query_complete_event_t * ce;
switch (event->type){
case SDP_QUERY_RFCOMM_SERVICE:
ve = (sdp_query_rfcomm_service_event_t*) event;
channel_nr = ve->channel_nr;
printf("** Service name: '%s', RFCOMM port %u\n", ve->service_name, channel_nr);
break;
case SDP_QUERY_COMPLETE:
ce = (sdp_query_complete_event_t*) event;
if (channel_nr > 0){
hsp_state = HSP_W4_RFCOMM_CONNECTED;
printf("RFCOMM create channel.\n");
rfcomm_create_channel_internal(NULL, &remote, channel_nr);
break;
}
hsp_state = HSP_IDLE;
printf("Service not found, status %u.\n", ce->status);
exit(0);
break;
}
}
void hsp_hs_create_service(uint8_t * service, int rfcomm_channel_nr, const char * name, uint8_t have_remote_audio_control){
uint8_t* attribute;
de_create_sequence(service);
// 0x0000 "Service Record Handle"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ServiceRecordHandle);
de_add_number(service, DE_UINT, DE_SIZE_32, 0x10001);
// 0x0001 "Service Class ID List"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ServiceClassIDList);
attribute = de_push_sequence(service);
{
// "UUID for PAN Service"
de_add_number(attribute, DE_UUID, DE_SIZE_16, SDP_Headset_HS);
de_add_number(attribute, DE_UUID, DE_SIZE_16, SDP_GenericAudio);
}
de_pop_sequence(service, attribute);
// 0x0004 "Protocol Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_ProtocolDescriptorList);
attribute = de_push_sequence(service);
{
uint8_t* l2cpProtocol = de_push_sequence(attribute);
{
de_add_number(l2cpProtocol, DE_UUID, DE_SIZE_16, SDP_L2CAPProtocol);
}
de_pop_sequence(attribute, l2cpProtocol);
uint8_t* rfcomm = de_push_sequence(attribute);
{
de_add_number(rfcomm, DE_UUID, DE_SIZE_16, SDP_RFCOMMProtocol); // rfcomm_service
de_add_number(rfcomm, DE_UINT, DE_SIZE_8, rfcomm_channel_nr); // rfcomm channel
}
de_pop_sequence(attribute, rfcomm);
}
de_pop_sequence(service, attribute);
// 0x0005 "Public Browse Group"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BrowseGroupList); // public browse group
attribute = de_push_sequence(service);
{
de_add_number(attribute, DE_UUID, DE_SIZE_16, SDP_PublicBrowseGroup);
}
de_pop_sequence(service, attribute);
// 0x0009 "Bluetooth Profile Descriptor List"
de_add_number(service, DE_UINT, DE_SIZE_16, SDP_BluetoothProfileDescriptorList);
attribute = de_push_sequence(service);
{
uint8_t *sppProfile = de_push_sequence(attribute);
{
de_add_number(sppProfile, DE_UUID, DE_SIZE_16, SDP_HSP);
de_add_number(sppProfile, DE_UINT, DE_SIZE_16, 0x0102); // Verision 1.2
}
de_pop_sequence(attribute, sppProfile);
}
de_pop_sequence(service, attribute);
// 0x0100 "Service Name"
de_add_number(service, DE_UINT, DE_SIZE_16, 0x0100);
if (name){
de_add_data(service, DE_STRING, strlen(name), (uint8_t *) name);
} else {
de_add_data(service, DE_STRING, strlen(default_hsp_hs_service_name), (uint8_t *) default_hsp_hs_service_name);
}
// Remote audio volume control
de_add_number(service, DE_UINT, DE_SIZE_16, 0x030C);
de_add_number(service, DE_BOOL, DE_SIZE_8, have_remote_audio_control);
}
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
printf("Client HCI init done\r\n");
// init L2CAP
l2cap_init();
l2cap_register_packet_handler(packet_handler);
rfcomm_init();
rfcomm_register_packet_handler(packet_handler);
rfcomm_register_service_internal(NULL, RFCOMM_SERVER_CHANNEL, 0xffff); // reserved channel, mtu limited by l2cap
// init SDP, create record for SPP and register with SDP
sdp_init();
memset(hsp_service_buffer, 0, sizeof(hsp_service_buffer));
hsp_hs_create_service(hsp_service_buffer, RFCOMM_SERVER_CHANNEL, NULL, 0);
hsp_hs_init();
sdp_register_service_internal(NULL, hsp_service_buffer);
sdp_query_rfcomm_register_callback(handle_query_rfcomm_event, NULL);
// turn on!
hci_power_control(HCI_POWER_ON);
// go!
run_loop_execute();
return 0;
}