btstack/example/embedded/spp_counter.c

// *****************************************************************************
//
// minimal setup for HCI code
//
// *****************************************************************************

#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "btstack-config.h"

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

#include "debug.h"
#include "btstack_memory.h"
#include "hci.h"
#include "hci_dump.h"

#include "l2cap.h"

#include "rfcomm.h"

#include "sdp.h"

#define RFCOMM_SERVER_CHANNEL 1
#define HEARTBEAT_PERIOD_MS 1000

static uint16_t  rfcomm_channel_id;
static uint8_t   spp_service_buffer[150];


static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
    bd_addr_t event_addr;
    uint8_t   rfcomm_channel_nr;
    uint16_t  mtu;
    int i;

	switch (packet_type) {
		case HCI_EVENT_PACKET:
			switch (packet[0]) {
					
				case BTSTACK_EVENT_STATE:
					// bt stack activated, get started - set local name
					if (packet[2] == HCI_STATE_WORKING) {
                        hci_send_cmd(&hci_write_local_name, "BTstack SPP Counter");
					}
					break;
				
				case HCI_EVENT_COMMAND_COMPLETE:
					if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)){
                        bt_flip_addr(event_addr, &packet[6]);
                        printf("BD-ADDR: %s\n", bd_addr_to_str(event_addr));
                        break;
                    }
                    break;
					
				case HCI_EVENT_PIN_CODE_REQUEST:
					// inform about pin code request
                    printf("Pin code request - using '0000'\n");
                    bt_flip_addr(event_addr, &packet[2]);
					hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
					break;

                case HCI_EVENT_USER_CONFIRMATION_REQUEST:
                    // inform about user confirmation request
                    printf("SSP User Confirmation Request with numeric value '%06u'\n", READ_BT_32(packet, 8));
                    printf("SSP User Confirmation Auto accept\n");
                    break;

                
                case RFCOMM_EVENT_INCOMING_CONNECTION:
					// data: event (8), len(8), address(48), channel (8), rfcomm_cid (16)
					bt_flip_addr(event_addr, &packet[2]); 
					rfcomm_channel_nr = packet[8];
					rfcomm_channel_id = READ_BT_16(packet, 9);
					printf("RFCOMM channel %u requested for %s\n", rfcomm_channel_nr, bd_addr_to_str(event_addr));
                    rfcomm_accept_connection_internal(rfcomm_channel_id);
					break;
					
				case RFCOMM_EVENT_OPEN_CHANNEL_COMPLETE:
					// data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16)
					if (packet[2]) {
						printf("RFCOMM channel open failed, status %u\n", packet[2]);
					} else {
						rfcomm_channel_id = 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_channel_id, mtu);
					}
					break;
                    
                case RFCOMM_EVENT_CHANNEL_CLOSED:
                    printf("RFCOMM channel closed\n");
                    rfcomm_channel_id = 0;
                    break;
                
                default:
                    break;
			}
            break;
        
        case RFCOMM_DATA_PACKET:
            printf("RCV: '");
            for (i=0;i<size;i++){
                putchar(packet[i]);
            }
            printf("'\n");
            break;

        default:
            break;
	}
}

static void  heartbeat_handler(struct timer *ts){

    static int counter = 0;

    if (rfcomm_channel_id){
        char lineBuffer[30];
        sprintf(lineBuffer, "BTstack counter %04u\n", ++counter);
        printf("%s", lineBuffer);
        if (rfcomm_can_send_packet_now(rfcomm_channel_id)) {
            int err = rfcomm_send_internal(rfcomm_channel_id, (uint8_t*) lineBuffer, strlen(lineBuffer));  
            if (err) {
                log_error("rfcomm_send_internal -> error 0X%02x", err);  
            }
        }   
    }
    
    run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
    run_loop_add_timer(ts);
} 

int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){

    hci_discoverable_control(1);

    l2cap_init();
    l2cap_register_packet_handler(packet_handler);

    rfcomm_init();
    rfcomm_register_packet_handler(packet_handler);
    rfcomm_register_service_internal(NULL, RFCOMM_SERVER_CHANNEL, 100);  // reserved channel, mtu=100

    // init SDP, create record for SPP and register with SDP
    sdp_init();
    memset(spp_service_buffer, 0, sizeof(spp_service_buffer));
#ifdef EMBEDDED
    service_record_item_t * service_record_item = (service_record_item_t *) spp_service_buffer;
    sdp_create_spp_service( (uint8_t*) &service_record_item->service_record, RFCOMM_SERVER_CHANNEL, "SPP Counter");
    printf("SDP service buffer size: %u\n", (uint16_t) (sizeof(service_record_item_t) + de_get_len((uint8_t*) &service_record_item->service_record)));
    sdp_register_service_internal(NULL, service_record_item);
#else
    sdp_create_spp_service( spp_service_buffer, RFCOMM_SERVER_CHANNEL, "SPP Counter");
    printf("SDP service record size: %u\n", de_get_len(spp_service_buffer));
    sdp_register_service_internal(NULL, spp_service_buffer);
#endif

    hci_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);

    // set one-shot timer
    timer_source_t heartbeat;
    heartbeat.process = &heartbeat_handler;
    run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
    run_loop_add_timer(&heartbeat);

    // turn on!
	hci_power_control(HCI_POWER_ON);
	
    // go!
    run_loop_execute();	
    
    // happy compiler!
    return 0;
}