/* * 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_flowcontrol.c" // ***************************************************************************** /* EXAMPLE_START(spp_flowcontrol): SPP Server - Flow Control * * @text This example adds explicit flow control for incoming RFCOMM data to the * SPP heartbeat counter example. We will highlight the changes compared to the * SPP counter example. */ // ***************************************************************************** #include #include #include #include #include "btstack.h" #define HEARTBEAT_PERIOD_MS 500 #define TEST_COD 0x1234 #define RFCOMM_SERVER_CHANNEL 1 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 rfcomm_send_credit = 0; static uint8_t spp_service_buffer[150]; static btstack_packet_callback_registration_t hci_event_callback_registration; /* @section SPP Service Setup * * @text Listing explicitFlowControl shows how to * provide one initial credit during RFCOMM service initialization. Please note * that providing a single credit effectively reduces the credit-based (sliding * window) flow control to a stop-and-wait flow control that limits the data * throughput substantially. */ /* LISTING_START(explicitFlowControl): Providing one initial credit during RFCOMM service initialization */ 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); // init L2CAP l2cap_init(); // init RFCOMM rfcomm_init(); // reserved channel, mtu limited by l2cap, 1 credit rfcomm_register_service_with_initial_credits(&packet_handler, RFCOMM_SERVER_CHANNEL, 0xffff, 1); // 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, 1, "SPP Counter"); sdp_register_service(spp_service_buffer); printf("SDP service buffer size: %u\n\r", (uint16_t) de_get_len(spp_service_buffer)); } /* LISTING_END */ /* @section Periodic Timer Setup * * @text Explicit credit management is * recommended when received RFCOMM data cannot be processed immediately. In this * example, delayed processing of received data is simulated with the help of a * periodic timer as follows. When the packet handler receives a data packet, it * does not provide a new credit, it sets a flag instead, see Listing phManual. * If the flag is set, a new * credit will be granted by the heartbeat handler, introducing a delay of up to 1 * second. The heartbeat handler code is shown in Listing hbhManual. */ static btstack_timer_source_t heartbeat; /* LISTING_START(hbhManual): Heartbeat handler with manual credit management */ static void heartbeat_handler(struct btstack_timer_source *ts){ if (rfcomm_send_credit){ rfcomm_grant_credits(rfcomm_channel_id, 1); rfcomm_send_credit = 0; } btstack_run_loop_set_timer(ts, HEARTBEAT_PERIOD_MS); btstack_run_loop_add_timer(ts); } /* LISTING_END */ static void one_shot_timer_setup(void){ heartbeat.process = &heartbeat_handler; btstack_run_loop_set_timer(&heartbeat, HEARTBEAT_PERIOD_MS); btstack_run_loop_add_timer(&heartbeat); } /* LISTING_START(phManual): Packet handler with manual credit management */ // Bluetooth logic static void packet_handler (uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size){ /* LISTING_PAUSE */ UNUSED(channel); 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)) { case HCI_EVENT_COMMAND_COMPLETE: if (HCI_EVENT_IS_COMMAND_COMPLETE(packet, hci_read_bd_addr)){ reverse_bd_addr(&packet[6], event_addr); printf("BD-ADDR: %s\n\r", bd_addr_to_str(event_addr)); break; } break; 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 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_CHANNEL_CLOSED: rfcomm_channel_id = 0; break; default: break; } break; /* LISTING_RESUME */ case RFCOMM_DATA_PACKET: for (i=0;i