282 lines
10 KiB
C
282 lines
10 KiB
C
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/*
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* Copyright (C) 2014 BlueKitchen GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* 4. Any redistribution, use, or modification is done solely for
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* personal benefit and not for any commercial purpose or for
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* monetary gain.
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*
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* THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS
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* RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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* THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Please inquire about commercial licensing options at
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* contact@bluekitchen-gmbh.com
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*
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*/
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#define BTSTACK_FILE__ "spp_counter.c"
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// *****************************************************************************
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/* EXAMPLE_START(spp_counter): SPP Server - Heartbeat Counter over RFCOMM
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*
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* @text The Serial port profile (SPP) is widely used as it provides a serial
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* port over Bluetooth. The SPP counter example demonstrates how to setup an SPP
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* service, and provide a periodic timer over RFCOMM.
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*
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* @text Note: To test, please run the spp_counter example, and then pair from
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* a remote device, and open the Virtual Serial Port.
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*/
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// *****************************************************************************
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#include <inttypes.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "btstack.h"
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#define RFCOMM_SERVER_CHANNEL 1
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#define HEARTBEAT_PERIOD_MS 1000
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static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size);
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static uint16_t rfcomm_channel_id;
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static uint8_t spp_service_buffer[150];
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static btstack_packet_callback_registration_t hci_event_callback_registration;
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/* @section SPP Service Setup
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*s
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* @text To provide an SPP service, the L2CAP, RFCOMM, and SDP protocol layers
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* are required. After setting up an RFCOMM service with channel nubmer
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* RFCOMM_SERVER_CHANNEL, an SDP record is created and registered with the SDP server.
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* Example code for SPP service setup is
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* provided in Listing SPPSetup. The SDP record created by function
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* spp_create_sdp_record consists of a basic SPP definition that uses the provided
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* RFCOMM channel ID and service name. For more details, please have a look at it
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* in \path{src/sdp_util.c}.
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* The SDP record is created on the fly in RAM and is deterministic.
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* To preserve valuable RAM, the result could be stored as constant data inside the ROM.
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*/
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/* LISTING_START(SPPSetup): SPP service setup */
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static void spp_service_setup(void)
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{
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// register for HCI events
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hci_event_callback_registration.callback = &packet_handler;
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hci_add_event_handler(&hci_event_callback_registration);
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l2cap_init();
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rfcomm_init();
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rfcomm_register_service(packet_handler, RFCOMM_SERVER_CHANNEL, 0xffff); // reserved channel, mtu limited by l2cap
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// init SDP, create record for SPP and register with SDP
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sdp_init();
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memset(spp_service_buffer, 0, sizeof(spp_service_buffer));
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spp_create_sdp_record(spp_service_buffer, 0x10001, RFCOMM_SERVER_CHANNEL, "SPP Counter");
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sdp_register_service(spp_service_buffer);
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printf("SDP service record size: %u\n", de_get_len(spp_service_buffer));
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}
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/* LISTING_END */
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/* @section Periodic Timer Setup
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*
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* @text The heartbeat handler increases the real counter every second,
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* and sends a text string with the counter value, as shown in Listing PeriodicCounter.
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*/
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/* LISTING_START(PeriodicCounter): Periodic Counter */
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static btstack_timer_source_t heartbeat;
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static char lineBuffer[30];
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static void heartbeat_handler(struct btstack_timer_source *ts)
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{
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static int counter = 0;
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if (rfcomm_channel_id)
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{
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sprintf(lineBuffer, "BTstack counter %04u\n", ++counter);
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printf("%s", lineBuffer);
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rfcomm_request_can_send_now_event(rfcomm_channel_id);
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}
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btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
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btstack_run_loop_add_timer(ts);
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}
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static void one_shot_timer_setup(void)
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{
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// set one-shot timer
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heartbeat.process = &heartbeat_handler;
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btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
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btstack_run_loop_add_timer(&heartbeat);
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}
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/* LISTING_END */
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/* @section Bluetooth Logic
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* @text The Bluetooth logic is implemented within the
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* packet handler, see Listing SppServerPacketHandler. In this example,
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* the following events are passed sequentially:
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* - BTSTACK_EVENT_STATE,
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* - HCI_EVENT_PIN_CODE_REQUEST (Standard pairing) or
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* - HCI_EVENT_USER_CONFIRMATION_REQUEST (Secure Simple Pairing),
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* - RFCOMM_EVENT_INCOMING_CONNECTION,
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* - RFCOMM_EVENT_CHANNEL_OPENED,
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* - RFCOMM_EVETN_CAN_SEND_NOW, and
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* - RFCOMM_EVENT_CHANNEL_CLOSED
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*/
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/* @text Upon receiving HCI_EVENT_PIN_CODE_REQUEST event, we need to handle
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* authentication. Here, we use a fixed PIN code "0000".
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*
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* When HCI_EVENT_USER_CONFIRMATION_REQUEST is received, the user will be
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* asked to accept the pairing request. If the IO capability is set to
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* SSP_IO_CAPABILITY_DISPLAY_YES_NO, the request will be automatically accepted.
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*
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* The RFCOMM_EVENT_INCOMING_CONNECTION event indicates an incoming connection.
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* Here, the connection is accepted. More logic is need, if you want to handle connections
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* from multiple clients. The incoming RFCOMM connection event contains the RFCOMM
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* channel number used during the SPP setup phase and the newly assigned RFCOMM
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* channel ID that is used by all BTstack commands and events.
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*
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* If RFCOMM_EVENT_CHANNEL_OPENED event returns status greater then 0,
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* then the channel establishment has failed (rare case, e.g., client crashes).
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* On successful connection, the RFCOMM channel ID and MTU for this
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* channel are made available to the heartbeat counter. After opening the RFCOMM channel,
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* the communication between client and the application
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* takes place. In this example, the timer handler increases the real counter every
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* second.
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*
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* RFCOMM_EVENT_CAN_SEND_NOW indicates that it's possible to send an RFCOMM packet
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* on the rfcomm_cid that is include
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*/
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/* LISTING_START(SppServerPacketHandler): SPP Server - Heartbeat Counter over RFCOMM */
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static void packet_handler(uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
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{
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UNUSED(channel);
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/* LISTING_PAUSE */
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bd_addr_t event_addr;
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uint8_t rfcomm_channel_nr;
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uint16_t mtu;
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int i;
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switch (packet_type)
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{
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case HCI_EVENT_PACKET:
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switch (hci_event_packet_get_type(packet))
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{
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/* LISTING_RESUME */
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case HCI_EVENT_PIN_CODE_REQUEST:
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// inform about pin code request
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printf("Pin code request - using '0000'\n");
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hci_event_pin_code_request_get_bd_addr(packet, event_addr);
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gap_pin_code_response(event_addr, "0000");
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break;
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case HCI_EVENT_USER_CONFIRMATION_REQUEST:
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// ssp: inform about user confirmation request
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printf("SSP User Confirmation Request with numeric value '%06" PRIu32 "'\n", little_endian_read_32(packet, 8));
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printf("SSP User Confirmation Auto accept\n");
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break;
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case RFCOMM_EVENT_INCOMING_CONNECTION:
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// data: event (8), len(8), address(48), channel (8), rfcomm_cid (16)
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rfcomm_event_incoming_connection_get_bd_addr(packet, event_addr);
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rfcomm_channel_nr = rfcomm_event_incoming_connection_get_server_channel(packet);
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rfcomm_channel_id = rfcomm_event_incoming_connection_get_rfcomm_cid(packet);
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printf("RFCOMM channel %u requested for %s\n", rfcomm_channel_nr, bd_addr_to_str(event_addr));
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rfcomm_accept_connection(rfcomm_channel_id);
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break;
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case RFCOMM_EVENT_CHANNEL_OPENED:
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// data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16)
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if (rfcomm_event_channel_opened_get_status(packet))
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{
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printf("RFCOMM channel open failed, status %u\n", rfcomm_event_channel_opened_get_status(packet));
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}
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else
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{
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rfcomm_channel_id = rfcomm_event_channel_opened_get_rfcomm_cid(packet);
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mtu = rfcomm_event_channel_opened_get_max_frame_size(packet);
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printf("RFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n", rfcomm_channel_id, mtu);
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}
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break;
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case RFCOMM_EVENT_CAN_SEND_NOW:
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rfcomm_send(rfcomm_channel_id, (uint8_t *)lineBuffer, strlen(lineBuffer));
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break;
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/* LISTING_PAUSE */
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case RFCOMM_EVENT_CHANNEL_CLOSED:
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printf("RFCOMM channel closed\n");
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rfcomm_channel_id = 0;
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break;
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default:
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break;
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}
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break;
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case RFCOMM_DATA_PACKET:
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printf("RCV: '");
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for (i = 0; i < size; i++)
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{
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putchar(packet[i]);
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}
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printf("'\n");
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break;
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default:
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break;
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}
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/* LISTING_RESUME */
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}
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/* LISTING_END */
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int btstack_main(int argc, const char *argv[]);
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int btstack_main(int argc, const char *argv[])
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{
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(void)argc;
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(void)argv;
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one_shot_timer_setup();
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spp_service_setup();
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gap_discoverable_control(1);
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gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO);
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gap_set_local_name("SPP Counter 00:00:00:00:00:00");
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hci_set_inquiry_mode(INQUIRY_MODE_RSSI_AND_EIR);
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hci_set_master_slave_policy(HCI_ROLE_MASTER);
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// turn on!
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hci_power_control(HCI_POWER_ON);
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return 0;
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}
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/* EXAMPLE_END */
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