1 /* 2 * Copyright (C) 2014 BlueKitchen GmbH 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the copyright holders nor the names of 14 * contributors may be used to endorse or promote products derived 15 * from this software without specific prior written permission. 16 * 4. Any redistribution, use, or modification is done solely for 17 * personal benefit and not for any commercial purpose or for 18 * monetary gain. 19 * 20 * THIS SOFTWARE IS PROVIDED BY BLUEKITCHEN GMBH AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL MATTHIAS 24 * RINGWALD OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 25 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 26 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 27 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 28 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 29 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 30 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * Please inquire about commercial licensing options at 34 * [email protected] 35 * 36 */ 37 38 #define BTSTACK_FILE__ "spp_counter.c" 39 40 // ***************************************************************************** 41 /* EXAMPLE_START(spp_counter): SPP Server - Heartbeat Counter over RFCOMM 42 * 43 * @text The Serial port profile (SPP) is widely used as it provides a serial 44 * port over Bluetooth. The SPP counter example demonstrates how to setup an SPP 45 * service, and provide a periodic timer over RFCOMM. 46 * 47 * @text Note: To test, please run the spp_counter example, and then pair from 48 * a remote device, and open the Virtual Serial Port. 49 */ 50 // ***************************************************************************** 51 52 #include <inttypes.h> 53 #include <stdint.h> 54 #include <stdio.h> 55 #include <stdlib.h> 56 #include <string.h> 57 58 #include "btstack.h" 59 60 #define RFCOMM_SERVER_CHANNEL 1 61 #define HEARTBEAT_PERIOD_MS 1000 62 63 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 64 65 static uint16_t rfcomm_channel_id; 66 static uint8_t spp_service_buffer[150]; 67 static btstack_packet_callback_registration_t hci_event_callback_registration; 68 69 70 /* @section SPP Service Setup 71 *s 72 * @text To provide an SPP service, the L2CAP, RFCOMM, and SDP protocol layers 73 * are required. After setting up an RFCOMM service with channel nubmer 74 * RFCOMM_SERVER_CHANNEL, an SDP record is created and registered with the SDP server. 75 * Example code for SPP service setup is 76 * provided in Listing SPPSetup. The SDP record created by function 77 * spp_create_sdp_record consists of a basic SPP definition that uses the provided 78 * RFCOMM channel ID and service name. For more details, please have a look at it 79 * in \path{src/sdp_util.c}. 80 * The SDP record is created on the fly in RAM and is deterministic. 81 * To preserve valuable RAM, the result could be stored as constant data inside the ROM. 82 */ 83 84 /* LISTING_START(SPPSetup): SPP service setup */ 85 static void spp_service_setup(void){ 86 87 // register for HCI events 88 hci_event_callback_registration.callback = &packet_handler; 89 hci_add_event_handler(&hci_event_callback_registration); 90 91 l2cap_init(); 92 93 rfcomm_init(); 94 rfcomm_register_service(packet_handler, RFCOMM_SERVER_CHANNEL, 0xffff); // reserved channel, mtu limited by l2cap 95 96 // init SDP, create record for SPP and register with SDP 97 sdp_init(); 98 memset(spp_service_buffer, 0, sizeof(spp_service_buffer)); 99 spp_create_sdp_record(spp_service_buffer, 0x10001, RFCOMM_SERVER_CHANNEL, "SPP Counter"); 100 sdp_register_service(spp_service_buffer); 101 printf("SDP service record size: %u\n", de_get_len(spp_service_buffer)); 102 } 103 /* LISTING_END */ 104 105 /* @section Periodic Timer Setup 106 * 107 * @text The heartbeat handler increases the real counter every second, 108 * and sends a text string with the counter value, as shown in Listing PeriodicCounter. 109 */ 110 111 /* LISTING_START(PeriodicCounter): Periodic Counter */ 112 static btstack_timer_source_t heartbeat; 113 static char lineBuffer[30]; 114 static void heartbeat_handler(struct btstack_timer_source *ts){ 115 static int counter = 0; 116 117 if (rfcomm_channel_id){ 118 sprintf(lineBuffer, "BTstack counter %04u\n", ++counter); 119 printf("%s", lineBuffer); 120 121 rfcomm_request_can_send_now_event(rfcomm_channel_id); 122 } 123 124 btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS); 125 btstack_run_loop_add_timer(ts); 126 } 127 128 static void one_shot_timer_setup(void){ 129 // set one-shot timer 130 heartbeat.process = &heartbeat_handler; 131 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 132 btstack_run_loop_add_timer(&heartbeat); 133 } 134 /* LISTING_END */ 135 136 137 /* @section Bluetooth Logic 138 * @text The Bluetooth logic is implemented within the 139 * packet handler, see Listing SppServerPacketHandler. In this example, 140 * the following events are passed sequentially: 141 * - BTSTACK_EVENT_STATE, 142 * - HCI_EVENT_PIN_CODE_REQUEST (Standard pairing) or 143 * - HCI_EVENT_USER_CONFIRMATION_REQUEST (Secure Simple Pairing), 144 * - RFCOMM_EVENT_INCOMING_CONNECTION, 145 * - RFCOMM_EVENT_CHANNEL_OPENED, 146 * - RFCOMM_EVETN_CAN_SEND_NOW, and 147 * - RFCOMM_EVENT_CHANNEL_CLOSED 148 */ 149 150 /* @text Upon receiving HCI_EVENT_PIN_CODE_REQUEST event, we need to handle 151 * authentication. Here, we use a fixed PIN code "0000". 152 * 153 * When HCI_EVENT_USER_CONFIRMATION_REQUEST is received, the user will be 154 * asked to accept the pairing request. If the IO capability is set to 155 * SSP_IO_CAPABILITY_DISPLAY_YES_NO, the request will be automatically accepted. 156 * 157 * The RFCOMM_EVENT_INCOMING_CONNECTION event indicates an incoming connection. 158 * Here, the connection is accepted. More logic is need, if you want to handle connections 159 * from multiple clients. The incoming RFCOMM connection event contains the RFCOMM 160 * channel number used during the SPP setup phase and the newly assigned RFCOMM 161 * channel ID that is used by all BTstack commands and events. 162 * 163 * If RFCOMM_EVENT_CHANNEL_OPENED event returns status greater then 0, 164 * then the channel establishment has failed (rare case, e.g., client crashes). 165 * On successful connection, the RFCOMM channel ID and MTU for this 166 * channel are made available to the heartbeat counter. After opening the RFCOMM channel, 167 * the communication between client and the application 168 * takes place. In this example, the timer handler increases the real counter every 169 * second. 170 * 171 * RFCOMM_EVENT_CAN_SEND_NOW indicates that it's possible to send an RFCOMM packet 172 * on the rfcomm_cid that is include 173 174 */ 175 176 /* LISTING_START(SppServerPacketHandler): SPP Server - Heartbeat Counter over RFCOMM */ 177 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 178 UNUSED(channel); 179 180 /* LISTING_PAUSE */ 181 bd_addr_t event_addr; 182 uint8_t rfcomm_channel_nr; 183 uint16_t mtu; 184 int i; 185 186 switch (packet_type) { 187 case HCI_EVENT_PACKET: 188 switch (hci_event_packet_get_type(packet)) { 189 /* LISTING_RESUME */ 190 case HCI_EVENT_PIN_CODE_REQUEST: 191 // inform about pin code request 192 printf("Pin code request - using '0000'\n"); 193 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 194 gap_pin_code_response(event_addr, "0000"); 195 break; 196 197 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 198 // ssp: inform about user confirmation request 199 printf("SSP User Confirmation Request with numeric value '%06"PRIu32"'\n", little_endian_read_32(packet, 8)); 200 printf("SSP User Confirmation Auto accept\n"); 201 break; 202 203 case RFCOMM_EVENT_INCOMING_CONNECTION: 204 // data: event (8), len(8), address(48), channel (8), rfcomm_cid (16) 205 rfcomm_event_incoming_connection_get_bd_addr(packet, event_addr); 206 rfcomm_channel_nr = rfcomm_event_incoming_connection_get_server_channel(packet); 207 rfcomm_channel_id = rfcomm_event_incoming_connection_get_rfcomm_cid(packet); 208 printf("RFCOMM channel %u requested for %s\n", rfcomm_channel_nr, bd_addr_to_str(event_addr)); 209 rfcomm_accept_connection(rfcomm_channel_id); 210 break; 211 212 case RFCOMM_EVENT_CHANNEL_OPENED: 213 // data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16) 214 if (rfcomm_event_channel_opened_get_status(packet)) { 215 printf("RFCOMM channel open failed, status %u\n", rfcomm_event_channel_opened_get_status(packet)); 216 } else { 217 rfcomm_channel_id = rfcomm_event_channel_opened_get_rfcomm_cid(packet); 218 mtu = rfcomm_event_channel_opened_get_max_frame_size(packet); 219 printf("RFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n", rfcomm_channel_id, mtu); 220 } 221 break; 222 case RFCOMM_EVENT_CAN_SEND_NOW: 223 rfcomm_send(rfcomm_channel_id, (uint8_t*) lineBuffer, strlen(lineBuffer)); 224 break; 225 226 /* LISTING_PAUSE */ 227 case RFCOMM_EVENT_CHANNEL_CLOSED: 228 printf("RFCOMM channel closed\n"); 229 rfcomm_channel_id = 0; 230 break; 231 232 default: 233 break; 234 } 235 break; 236 237 case RFCOMM_DATA_PACKET: 238 printf("RCV: '"); 239 for (i=0;i<size;i++){ 240 putchar(packet[i]); 241 } 242 printf("'\n"); 243 break; 244 245 default: 246 break; 247 } 248 /* LISTING_RESUME */ 249 } 250 /* LISTING_END */ 251 252 int btstack_main(int argc, const char * argv[]); 253 int btstack_main(int argc, const char * argv[]){ 254 (void)argc; 255 (void)argv; 256 257 one_shot_timer_setup(); 258 spp_service_setup(); 259 260 gap_discoverable_control(1); 261 gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO); 262 gap_set_local_name("SPP Counter 00:00:00:00:00:00"); 263 264 // turn on! 265 hci_power_control(HCI_POWER_ON); 266 267 return 0; 268 } 269 /* EXAMPLE_END */ 270 271