/* * 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 * */ #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 #include #include #include #include #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"); hci_set_inquiry_mode(INQUIRY_MODE_RSSI_AND_EIR); hci_set_master_slave_policy(HCI_ROLE_MASTER); // turn on! hci_power_control(HCI_POWER_ON); return 0; } /* EXAMPLE_END */