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 // ***************************************************************************** 39 /* EXAMPLE_START(spp_counter): SPP Server - Heartbeat Counter over RFCOMM 40 * 41 * @text The Serial port profile (SPP) is widely used as it provides a serial 42 * port over Bluetooth. The SPP counter example demonstrates how to setup an SPP 43 * service, and provide a periodic timer over RFCOMM. 44 */ 45 // ***************************************************************************** 46 47 #include <inttypes.h> 48 #include <stdint.h> 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 53 #include "btstack.h" 54 55 #define RFCOMM_SERVER_CHANNEL 1 56 #define HEARTBEAT_PERIOD_MS 1000 57 58 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size); 59 60 static uint16_t rfcomm_channel_id; 61 static uint8_t spp_service_buffer[150]; 62 static btstack_packet_callback_registration_t hci_event_callback_registration; 63 64 65 /* @section SPP Service Setup 66 *s 67 * @text To provide an SPP service, the L2CAP, RFCOMM, and SDP protocol layers 68 * are required. After setting up an RFCOMM service with channel nubmer 69 * RFCOMM_SERVER_CHANNEL, an SDP record is created and registered with the SDP server. 70 * Example code for SPP service setup is 71 * provided in Listing SPPSetup. The SDP record created by function 72 * spp_create_sdp_record consists of a basic SPP definition that uses the provided 73 * RFCOMM channel ID and service name. For more details, please have a look at it 74 * in \path{src/sdp_util.c}. 75 * The SDP record is created on the fly in RAM and is deterministic. 76 * To preserve valuable RAM, the result could be stored as constant data inside the ROM. 77 */ 78 79 /* LISTING_START(SPPSetup): SPP service setup */ 80 static void spp_service_setup(void){ 81 82 // register for HCI events 83 hci_event_callback_registration.callback = &packet_handler; 84 hci_add_event_handler(&hci_event_callback_registration); 85 86 l2cap_init(); 87 88 rfcomm_init(); 89 rfcomm_register_service(packet_handler, RFCOMM_SERVER_CHANNEL, 0xffff); // reserved channel, mtu limited by l2cap 90 91 // init SDP, create record for SPP and register with SDP 92 sdp_init(); 93 memset(spp_service_buffer, 0, sizeof(spp_service_buffer)); 94 spp_create_sdp_record(spp_service_buffer, 0x10001, RFCOMM_SERVER_CHANNEL, "SPP Counter"); 95 sdp_register_service(spp_service_buffer); 96 printf("SDP service record size: %u\n", de_get_len(spp_service_buffer)); 97 } 98 /* LISTING_END */ 99 100 /* @section Periodic Timer Setup 101 * 102 * @text The heartbeat handler increases the real counter every second, 103 * and sends a text string with the counter value, as shown in Listing PeriodicCounter. 104 */ 105 106 /* LISTING_START(PeriodicCounter): Periodic Counter */ 107 static btstack_timer_source_t heartbeat; 108 static char lineBuffer[30]; 109 static void heartbeat_handler(struct btstack_timer_source *ts){ 110 static int counter = 0; 111 112 if (rfcomm_channel_id){ 113 sprintf(lineBuffer, "BTstack counter %04u\n", ++counter); 114 printf("%s", lineBuffer); 115 116 rfcomm_request_can_send_now_event(rfcomm_channel_id); 117 } 118 119 btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS); 120 btstack_run_loop_add_timer(ts); 121 } 122 123 static void one_shot_timer_setup(void){ 124 // set one-shot timer 125 heartbeat.process = &heartbeat_handler; 126 btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); 127 btstack_run_loop_add_timer(&heartbeat); 128 } 129 /* LISTING_END */ 130 131 132 /* @section Bluetooth Logic 133 * @text The Bluetooth logic is implemented within the 134 * packet handler, see Listing SppServerPacketHandler. In this example, 135 * the following events are passed sequentially: 136 * - BTSTACK_EVENT_STATE, 137 * - HCI_EVENT_PIN_CODE_REQUEST (Standard pairing) or 138 * - HCI_EVENT_USER_CONFIRMATION_REQUEST (Secure Simple Pairing), 139 * - RFCOMM_EVENT_INCOMING_CONNECTION, 140 * - RFCOMM_EVENT_CHANNEL_OPENED, 141 * - RFCOMM_EVETN_CAN_SEND_NOW, and 142 * - RFCOMM_EVENT_CHANNEL_CLOSED 143 */ 144 145 /* @text Upon receiving HCI_EVENT_PIN_CODE_REQUEST event, we need to handle 146 * authentication. Here, we use a fixed PIN code "0000". 147 * 148 * When HCI_EVENT_USER_CONFIRMATION_REQUEST is received, the user will be 149 * asked to accept the pairing request. If the IO capability is set to 150 * SSP_IO_CAPABILITY_DISPLAY_YES_NO, the request will be automatically accepted. 151 * 152 * The RFCOMM_EVENT_INCOMING_CONNECTION event indicates an incoming connection. 153 * Here, the connection is accepted. More logic is need, if you want to handle connections 154 * from multiple clients. The incoming RFCOMM connection event contains the RFCOMM 155 * channel number used during the SPP setup phase and the newly assigned RFCOMM 156 * channel ID that is used by all BTstack commands and events. 157 * 158 * If RFCOMM_EVENT_CHANNEL_OPENED event returns status greater then 0, 159 * then the channel establishment has failed (rare case, e.g., client crashes). 160 * On successful connection, the RFCOMM channel ID and MTU for this 161 * channel are made available to the heartbeat counter. After opening the RFCOMM channel, 162 * the communication between client and the application 163 * takes place. In this example, the timer handler increases the real counter every 164 * second. 165 * 166 * RFCOMM_EVENT_CAN_SEND_NOW indicates that it's possible to send an RFCOMM packet 167 * on the rfcomm_cid that is include 168 169 */ 170 171 /* LISTING_START(SppServerPacketHandler): SPP Server - Heartbeat Counter over RFCOMM */ 172 static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ 173 /* LISTING_PAUSE */ 174 bd_addr_t event_addr; 175 uint8_t rfcomm_channel_nr; 176 uint16_t mtu; 177 int i; 178 179 switch (packet_type) { 180 case HCI_EVENT_PACKET: 181 switch (hci_event_packet_get_type(packet)) { 182 /* LISTING_RESUME */ 183 case HCI_EVENT_PIN_CODE_REQUEST: 184 // pre-ssp: inform about pin code request 185 printf("Pin code request - using '0000'\n"); 186 hci_event_pin_code_request_get_bd_addr(packet, event_addr); 187 hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000"); 188 break; 189 190 case HCI_EVENT_USER_CONFIRMATION_REQUEST: 191 // ssp: inform about user confirmation request 192 printf("SSP User Confirmation Request with numeric value '%06"PRIu32"'\n", little_endian_read_32(packet, 8)); 193 printf("SSP User Confirmation Auto accept\n"); 194 break; 195 196 case RFCOMM_EVENT_INCOMING_CONNECTION: 197 // data: event (8), len(8), address(48), channel (8), rfcomm_cid (16) 198 rfcomm_event_incoming_connection_get_bd_addr(packet, event_addr); 199 rfcomm_channel_nr = rfcomm_event_incoming_connection_get_server_channel(packet); 200 rfcomm_channel_id = rfcomm_event_incoming_connection_get_rfcomm_cid(packet); 201 printf("RFCOMM channel %u requested for %s\n", rfcomm_channel_nr, bd_addr_to_str(event_addr)); 202 rfcomm_accept_connection(rfcomm_channel_id); 203 break; 204 205 case RFCOMM_EVENT_CHANNEL_OPENED: 206 // data: event(8), len(8), status (8), address (48), server channel(8), rfcomm_cid(16), max frame size(16) 207 if (rfcomm_event_channel_opened_get_status(packet)) { 208 printf("RFCOMM channel open failed, status %u\n", rfcomm_event_channel_opened_get_status(packet)); 209 } else { 210 rfcomm_channel_id = rfcomm_event_channel_opened_get_rfcomm_cid(packet); 211 mtu = rfcomm_event_channel_opened_get_max_frame_size(packet); 212 printf("RFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n", rfcomm_channel_id, mtu); 213 } 214 break; 215 case RFCOMM_EVENT_CAN_SEND_NOW: 216 rfcomm_send(rfcomm_channel_id, (uint8_t*) lineBuffer, strlen(lineBuffer)); 217 break; 218 219 /* LISTING_PAUSE */ 220 case RFCOMM_EVENT_CHANNEL_CLOSED: 221 printf("RFCOMM channel closed\n"); 222 rfcomm_channel_id = 0; 223 break; 224 225 default: 226 break; 227 } 228 break; 229 230 case RFCOMM_DATA_PACKET: 231 printf("RCV: '"); 232 for (i=0;i<size;i++){ 233 putchar(packet[i]); 234 } 235 printf("'\n"); 236 break; 237 238 default: 239 break; 240 } 241 /* LISTING_RESUME */ 242 } 243 /* LISTING_END */ 244 245 int btstack_main(int argc, const char * argv[]); 246 int btstack_main(int argc, const char * argv[]){ 247 one_shot_timer_setup(); 248 spp_service_setup(); 249 250 gap_discoverable_control(1); 251 gap_ssp_set_io_capability(SSP_IO_CAPABILITY_DISPLAY_YES_NO); 252 gap_set_local_name("BTstack SPP Counter"); 253 254 // turn on! 255 hci_power_control(HCI_POWER_ON); 256 257 return 0; 258 } 259 /* EXAMPLE_END */ 260 261