2014-11-06 23:11:45 +00:00
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// *****************************************************************************
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//
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// spp_flowcontrol demo - it provides a SPP that use sincoming flow control
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// Processing of data is simulated by granting the next
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// credit only every second in the heartbeat handler
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//
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// *****************************************************************************
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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/hci_cmds.h>
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#include <btstack/run_loop.h>
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#include <btstack/sdp_util.h>
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#include "hci.h"
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#include "l2cap.h"
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#include "btstack_memory.h"
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#include "rfcomm.h"
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#include "sdp.h"
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#include "btstack-config.h"
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#define HEARTBEAT_PERIOD_MS 500
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static uint8_t rfcomm_channel_nr = 1;
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static uint16_t rfcomm_channel_id;
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static uint8_t rfcomm_send_credit = 0;
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static uint8_t spp_service_buffer[150];
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// Bluetooth logic
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static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){
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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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switch (packet_type) {
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case HCI_EVENT_PACKET:
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switch (packet[0]) {
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case BTSTACK_EVENT_STATE:
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// bt stack activated, get started - set local name
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if (packet[2] == HCI_STATE_WORKING) {
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hci_send_cmd(&hci_write_local_name, "BTstack SPP Flow Control");
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}
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break;
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case HCI_EVENT_COMMAND_COMPLETE:
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if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)){
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bt_flip_addr(event_addr, &packet[6]);
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printf("BD-ADDR: %s\n\r", bd_addr_to_str(event_addr));
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break;
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}
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if (COMMAND_COMPLETE_EVENT(packet, hci_write_local_name)){
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hci_discoverable_control(1);
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break;
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}
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break;
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case HCI_EVENT_LINK_KEY_REQUEST:
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// deny link key request
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printf("Link key request\n\r");
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bt_flip_addr(event_addr, &packet[2]);
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hci_send_cmd(&hci_link_key_request_negative_reply, &event_addr);
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break;
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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\r");
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bt_flip_addr(event_addr, &packet[2]);
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hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
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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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bt_flip_addr(event_addr, &packet[2]);
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rfcomm_channel_nr = packet[8];
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rfcomm_channel_id = READ_BT_16(packet, 9);
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printf("RFCOMM channel %u requested for %s\n\r", rfcomm_channel_nr, bd_addr_to_str(event_addr));
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rfcomm_accept_connection_internal(rfcomm_channel_id);
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break;
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case RFCOMM_EVENT_OPEN_CHANNEL_COMPLETE:
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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 (packet[2]) {
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printf("RFCOMM channel open failed, status %u\n\r", packet[2]);
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} else {
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rfcomm_channel_id = READ_BT_16(packet, 12);
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mtu = READ_BT_16(packet, 14);
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printf("\n\rRFCOMM channel open succeeded. New RFCOMM Channel ID %u, max frame size %u\n\r", rfcomm_channel_id, mtu);
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}
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break;
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case RFCOMM_EVENT_CHANNEL_CLOSED:
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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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// hack: truncate data (we know that the packet is at least on byte bigger
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packet[size] = 0;
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puts( (const char *) packet);
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rfcomm_send_credit = 1;
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default:
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break;
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}
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}
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static void heartbeat_handler(struct timer *ts){
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if (rfcomm_send_credit){
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rfcomm_grant_credits(rfcomm_channel_id, 1);
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rfcomm_send_credit = 0;
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}
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run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS);
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run_loop_add_timer(ts);
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}
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2014-11-15 17:15:11 +00:00
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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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2014-11-06 23:11:45 +00:00
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// init L2CAP
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l2cap_init();
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l2cap_register_packet_handler(packet_handler);
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// init RFCOMM
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rfcomm_init();
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rfcomm_register_packet_handler(packet_handler);
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2014-12-11 16:24:30 +00:00
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rfcomm_register_service_with_initial_credits_internal(NULL, rfcomm_channel_nr, 0xffff, 1); // reserved channel, mtu limited by l2cap, 1 credit
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2014-11-06 23:11:45 +00:00
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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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service_record_item_t * service_record_item = (service_record_item_t *) spp_service_buffer;
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sdp_create_spp_service( (uint8_t*) &service_record_item->service_record, 1, "SPP Counter");
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printf("SDP service buffer size: %u\n\r", (uint16_t) (sizeof(service_record_item_t) + de_get_len((uint8_t*) &service_record_item->service_record)));
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sdp_register_service_internal(NULL, service_record_item);
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// set one-shot timer
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timer_source_t heartbeat;
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heartbeat.process = &heartbeat_handler;
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run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS);
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run_loop_add_timer(&heartbeat);
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puts("SPP FlowControl Demo: simulates processing on received data...\n\r");
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// turn on!
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hci_power_control(HCI_POWER_ON);
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// go!
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run_loop_execute();
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// happy compiler!
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return 0;
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}
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