btstack/example/libusb/l2cap_test.c

// *****************************************************************************
//
// minimal setup for SDP client over USB or UART
//
// *****************************************************************************

#include "btstack-config.h"

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/uio.h>
#include <unistd.h>
#include <termios.h>

#include <btstack/hci_cmds.h>
#include <btstack/run_loop.h>

#include "hci.h"
#include "gap.h"
#include "btstack_memory.h"
#include "hci_dump.h"
#include "l2cap.h"

void show_usage();

// static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
static bd_addr_t remote = {0x84, 0x38, 0x35, 0x65, 0xD1, 0x15};

static uint16_t handle;
static uint16_t local_cid;

static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){

    bd_addr_t event_addr;
    uint16_t psm;

    if (packet_type != HCI_EVENT_PACKET) return;

    switch (packet[0]) {
        case BTSTACK_EVENT_STATE:
            // bt stack activated, get started 
            if (packet[2] == HCI_STATE_WORKING){
                printf("BTstack L2CAP Test Ready\n");
                show_usage();
            }
            break;
        case L2CAP_EVENT_CHANNEL_OPENED:
            // inform about new l2cap connection
            bt_flip_addr(event_addr, &packet[3]);
            psm = READ_BT_16(packet, 11); 
            local_cid = READ_BT_16(packet, 13); 
            handle = READ_BT_16(packet, 9);
            if (packet[2] == 0) {
                printf("Channel successfully opened: %s, handle 0x%02x, psm 0x%02x, local cid 0x%02x, remote cid 0x%02x\n",
                       bd_addr_to_str(event_addr), handle, psm, local_cid,  READ_BT_16(packet, 15));
            } else {
                printf("L2CAP connection to device %s failed. status code %u\n", bd_addr_to_str(event_addr), packet[2]);
            }
            break;
        case L2CAP_EVENT_INCOMING_CONNECTION: {
            uint16_t l2cap_cid  = READ_BT_16(packet, 12);
            printf("L2CAP Accepting incoming connection request\n"); 
            l2cap_accept_connection_internal(l2cap_cid);
            break;
        }


        default:
            break;
    }
}

static void packet_handler2 (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    packet_handler(packet_type, 0, packet, size);
}

static void btstack_setup(){
    printf("Starting up..\n");
    /// GET STARTED ///
    btstack_memory_init();
    run_loop_init(RUN_LOOP_POSIX);
    
    hci_dump_open("/tmp/hci_dump.pklg", HCI_DUMP_PACKETLOGGER);
   
    hci_transport_t    * transport = hci_transport_usb_instance();
    hci_uart_config_t  * config = NULL;
    bt_control_t       * control   = NULL;    

    remote_device_db_t * remote_db = (remote_device_db_t *) &remote_device_db_memory;
    hci_init(transport, config, control, remote_db);
    hci_set_class_of_device(0x200404);
    hci_discoverable_control(1);

    l2cap_init();
    l2cap_register_packet_handler(&packet_handler2);
    l2cap_register_service_internal(NULL, packet_handler, PSM_SDP, 100, LEVEL_0);
    
    // turn on!
    hci_power_control(HCI_POWER_ON);
}


void show_usage(){
    printf("\n--- CLI for L2CAP TEST ---\n");
    printf("c      - create connection to SDP at addr %s\n", bd_addr_to_str(remote));
    printf("s      - send data\n");
    printf("e      - send echo request\n");
    printf("d      - disconnect\n");
    printf("Ctrl-c - exit\n");
    printf("---\n");
}

int  stdin_process(struct data_source *ds){
    char buffer;
    read(ds->fd, &buffer, 1);
    switch (buffer){
        case 'c':
            printf("Creating L2CAP Connection to %s, PSM SDP\n", bd_addr_to_str(remote));
            l2cap_create_channel_internal(NULL, packet_handler, remote, PSM_SDP, 100);
            break;
        case 's':
            printf("Send L2CAP Data\n");
            l2cap_send_internal(local_cid, (uint8_t *) "0123456789", 10);
       break;
        case 'e':
            printf("Send L2CAP ECHO Request\n");
            l2cap_send_echo_request(handle, (uint8_t *)  "Hello World!", 13);
            break;
        case 'd':
            printf("L2CAP Channel Closed\n");
            l2cap_disconnect_internal(local_cid, 0);
            break;
        case '\n':
        case '\r':
            break;
        default:
            show_usage();
            break;

    }
    return 0;
}

static data_source_t stdin_source;
void setup_cli(){

    struct termios term = {0};
    if (tcgetattr(0, &term) < 0)
            perror("tcsetattr()");
    term.c_lflag &= ~ICANON;
    term.c_lflag &= ~ECHO;
    term.c_cc[VMIN] = 1;
    term.c_cc[VTIME] = 0;
    if (tcsetattr(0, TCSANOW, &term) < 0)
            perror("tcsetattr ICANON");

    stdin_source.fd = 0; // stdin
    stdin_source.process = &stdin_process;
    run_loop_add_data_source(&stdin_source);
}

int main(void){
    btstack_setup();
    setup_cli();
    run_loop_execute(); 
    return 0;
}