/*
* 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
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* 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
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*
* Please inquire about commercial licensing options at
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*/
#define BTSTACK_FILE__ "spp_counter.c"
// *****************************************************************************
/* EXAMPLE_START(spp_counter): SPP Server - Heartbeat Counter over RFCOMM
*
* @text The Serial port profile (SPP) is widely used as it provides a serial
* port over Bluetooth. The SPP counter example demonstrates how to setup an SPP
* service, and provide a periodic timer over RFCOMM.
*
* @text Note: To test, please run the spp_counter example, and then pair from
* a remote device, and open the Virtual Serial Port.
*/
// *****************************************************************************
#include <inttypes.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "btstack.h"
#define RFCOMM_SERVER_CHANNEL 1
#define HEARTBEAT_PERIOD_MS 1000
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
static uint16_t rfcomm_channel_id;
static uint8_t spp_service_buffer[150];
static btstack_packet_callback_registration_t hci_event_callback_registration;
/* @section SPP Service Setup
*s
* @text To provide an SPP service, the L2CAP, RFCOMM, and SDP protocol layers
* are required. After setting up an RFCOMM service with channel nubmer
* RFCOMM_SERVER_CHANNEL, an SDP record is created and registered with the SDP server.
* Example code for SPP service setup is
* provided in Listing SPPSetup. The SDP record created by function
* spp_create_sdp_record consists of a basic SPP definition that uses the provided
* RFCOMM channel ID and service name. For more details, please have a look at it
* in \path{src/sdp_util.c}.
* The SDP record is created on the fly in RAM and is deterministic.
* To preserve valuable RAM, the result could be stored as constant data inside the ROM.
*/
/* LISTING_START(SPPSetup): SPP service setup */
static void spp_service_setup(void){
// register for HCI events
hci_event_callback_registration.callback = &packet_handler;
hci_add_event_handler(&hci_event_callback_registration);
l2cap_init();
rfcomm_init();
rfcomm_register_service(packet_handler, RFCOMM_SERVER_CHANNEL, 0xffff); // reserved channel, mtu limited by l2cap
// init SDP, create record for SPP and register with SDP
sdp_init();
memset(spp_service_buffer, 0, sizeof(spp_service_buffer));
spp_create_sdp_record(spp_service_buffer, 0x10001, RFCOMM_SERVER_CHANNEL, "SPP Counter");
sdp_register_service(spp_service_buffer);
printf("SDP service record size: %u\n", de_get_len(spp_service_buffer));
}
/* LISTING_END */
/* @section Periodic Timer Setup
*
* @text The heartbeat handler increases the real counter every second,
* and sends a text string with the counter value, as shown in Listing PeriodicCounter.
*/
/* LISTING_START(PeriodicCounter): Periodic Counter */
static btstack_timer_source_t heartbeat;
static char lineBuffer[30];
static void heartbeat_handler(struct btstack_timer_source *ts){
static int counter = 0;
if (rfcomm_channel_id){
sprintf(lineBuffer, "BTstack counter %04u\n", ++counter);
printf("%s", lineBuffer);
rfcomm_request_can_send_now_event(rfcomm_channel_id);
}
btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
btstack_run_loop_add_timer(ts);
}
static void one_shot_timer_setup(void){
// set one-shot timer
heartbeat.process = &heartbeat_handler;
btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
btstack_run_loop_add_timer(&heartbeat);
}
/* LISTING_END */
/* @section Bluetooth Logic
* @text The Bluetooth logic is implemented within the
* packet handler, see Listing SppServerPacketHandler. In this example,
* the following events are passed sequentially:
* - BTSTACK_EVENT_STATE,
* - HCI_EVENT_PIN_CODE_REQUEST (Standard pairing) or
* - HCI_EVENT_USER_CONFIRMATION_REQUEST (Secure Simple Pairing),
* - RFCOMM_EVENT_INCOMING_CONNECTION,
* - RFCOMM_EVENT_CHANNEL_OPENED,
* - RFCOMM_EVETN_CAN_SEND_NOW, and
* - RFCOMM_EVENT_CHANNEL_CLOSED
*/
/* @text Upon receiving HCI_EVENT_PIN_CODE_REQUEST event, we need to handle
* authentication. Here, we use a fixed PIN code "0000".
*
* When HCI_EVENT_USER_CONFIRMATION_REQUEST is received, the user will be
* asked to accept the pairing request. If the IO capability is set to
* SSP_IO_CAPABILITY_DISPLAY_YES_NO, the request will be automatically accepted.
*
* The RFCOMM_EVENT_INCOMING_CONNECTION event indicates an incoming connection.
* Here, the connection is accepted. More logic is need, if you want to handle connections
* from multiple clients. The incoming RFCOMM connection event contains the RFCOMM
* channel number used during the SPP setup phase and the newly assigned RFCOMM
* channel ID that is used by all BTstack commands and events.
*
* If RFCOMM_EVENT_CHANNEL_OPENED event returns status greater then 0,
* then the channel establishment has failed (rare case, e.g., client crashes).
* On successful connection, the RFCOMM channel ID and MTU for this
* channel are made available to the heartbeat counter. After opening the RFCOMM channel,
* the communication between client and the application
* takes place. In this example, the timer handler increases the real counter every
* second.
*
* RFCOMM_EVENT_CAN_SEND_NOW indicates that it's possible to send an RFCOMM packet
* on the rfcomm_cid that is include
*/
/* LISTING_START(SppServerPacketHandler): SPP Server - Heartbeat Counter over RFCOMM */
static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
UNUSED(channel);
/* LISTING_PAUSE */
bd_addr_t event_addr;
uint8_t rfcomm_channel_nr;
uint16_t mtu;
int i;
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (hci_event_packet_get_type(packet)) {
/* LISTING_RESUME */
case HCI_EVENT_PIN_CODE_REQUEST:
// inform about pin code request
printf("Pin code request - using '0000'\n");
hci_event_pin_code_request_get_bd_addr(packet, event_addr);
gap_pin_code_response(event_addr, "0000");
break;
case HCI_EVENT_USER_CONFIRMATION_REQUEST:
// ssp: inform about user confirmation request
printf("SSP User Confirmation Request with numeric value '%06"PRIu32"'\n", little_endian_read_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)
rfcomm_event_incoming_connection_get_bd_addr(packet, event_addr);
rfcomm_channel_nr = rfcomm_event_incoming_connection_get_server_channel(packet);
rfcomm_channel_id = rfcomm_event_incoming_connection_get_rfcomm_cid(packet);
printf("RFCOMM channel %u requested for %s\n", rfcomm_channel_nr, bd_addr_to_str(event_addr));
rfcomm_accept_connection(rfcomm_channel_id);
break;
case RFCOMM_EVENT_CHANNEL_OPENED:
// data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16)
if (rfcomm_event_channel_opened_get_status(packet)) {
printf("RFCOMM channel open failed, status %u\n", rfcomm_event_channel_opened_get_status(packet));
} else {
rfcomm_channel_id = rfcomm_event_channel_opened_get_rfcomm_cid(packet);
mtu = rfcomm_event_channel_opened_get_max_frame_size(packet);
printf("RFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n", rfcomm_channel_id, mtu);
}
break;
case RFCOMM_EVENT_CAN_SEND_NOW:
rfcomm_send(rfcomm_channel_id, (uint8_t*) lineBuffer, strlen(lineBuffer));
break;
/* LISTING_PAUSE */
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;
}
/* LISTING_RESUME */
}
/* LISTING_END */
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
(void)argc;
(void)argv;
one_shot_timer_setup();
spp_service_setup();
gap_discoverable_control(1);
gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
gap_set_local_name("SPP Counter 00:00:00:00:00:00");
// turn on!
hci_power_control(HCI_POWER_ON);
return 0;
}
/* EXAMPLE_END */