Hi All.
I have modified the ble_app_multilink_central project, and replaced the button service LBS with the NUS service. When I switch on my peripheral device (based on the ble_app_uart project), then I get the following errors;
<info> app: Multilink example started.
<info> app: Start scanning for device name SWTG1.
<info> app: Name is a match
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<info> app: Connection 0x0 established, starting DB discovery.
<info> app: Start scanning for device name SWTG1.
<error> nrf_ble_gatt: sd_ble_gatts_exchange_mtu_reply() returned NRF_ERROR_INVALID_PARAM.
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<error> nrf_ble_gatt: sd_ble_gattc_exchange_mtu_request() returned NRF_ERROR_INVALID_PARAM.
<info> app: NUS service discovered on conn_handle 0x0
<info> app: Connected to device with Nordic UART Service.
<info> app: NUS service discovered on conn_handle 0x0
<error> app: ERROR 17 [NRF_ERROR_BUSY] at C:\Nordic_Semi\nRF5_SDK_15.0.0_a53641a\examples\ble_central\ble_app_multilink_central - Dock\main.c:205
PC at: 0x0002D60B
<error> app: End of error report
I have adjusted the ble connection parameters of both to match, and updated the NRF_SDH_BLE_GATT_MAX_MTU_SIZE in the sdk_config (had to update the RAM start location after that update).
I have attached the main.c and config file. Is there anything obvious I have missed?
Thanks
/**
* Copyright (c) 2014 - 2018, Nordic Semiconductor ASA
*
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*
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*
* 1. Redistributions of source code must retain the above copyright notice, this
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*
* 2. Redistributions in binary form, except as embedded into a Nordic
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*
* 3. Neither the name of Nordic Semiconductor ASA nor the names of its
* contributors may be used to endorse or promote products derived from this
* software without specific prior written permission.
*
* 4. This software, with or without modification, must only be used with a
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*
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*
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*/
/**
* @brief BLE LED Button Service central and client application main file.
*
* This example can be a central for up to 8 peripherals.
* The peripheral is called ble_app_blinky and can be found in the ble_peripheral
* folder.
*/
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include "nordic_common.h"
#include "nrf_sdh.h"
#include "nrf_sdh_ble.h"
#include "app_timer.h"
#include "bsp_btn_ble.h"
#include "ble.h"
#include "ble_hci.h"
#include "ble_advdata.h"
#include "ble_advertising.h"
#include "ble_conn_params.h"
#include "ble_db_discovery.h"
//#include "ble_lbs_c.h"
#include "ble_nus_c.h"
#include "ble_conn_state.h"
#include "nrf_ble_gatt.h"
#include "nrf_pwr_mgmt.h"
#include "nrf_log.h"
#include "nrf_log_ctrl.h"
#include "nrf_log_default_backends.h"
#define APP_BLE_CONN_CFG_TAG 1 /**< A tag that refers to the BLE stack configuration we set with @ref sd_ble_cfg_set. Default tag is @ref APP_BLE_CONN_CFG_TAG. */
#define APP_BLE_OBSERVER_PRIO 3 /**< Application's BLE observer priority. You shouldn't need to modify this value. */
#define UART_TX_BUF_SIZE 256 /**< UART TX buffer size. */
#define UART_RX_BUF_SIZE 256 /**< UART RX buffer size. */
#define CENTRAL_SCANNING_LED BSP_BOARD_LED_0
#define CENTRAL_CONNECTED_LED BSP_BOARD_LED_1
#define LEDBUTTON_LED BSP_BOARD_LED_2 /**< LED to indicate a change of state of the the Button characteristic on the peer. */
#define LEDBUTTON_BUTTON BSP_BUTTON_0 /**< Button that will write to the LED characteristic of the peer. */
#define BUTTON_DETECTION_DELAY APP_TIMER_TICKS(50) /**< Delay from a GPIOTE event until a button is reported as pushed (in number of timer ticks). */
#define SCAN_INTERVAL 0x00A0 /**< Determines scan interval in units of 0.625 millisecond. */
#define SCAN_WINDOW 0x0050 /**< Determines scan window in units of 0.625 millisecond. */
#define SCAN_DURATION 0x0000 /**< Duration of the scanning in units of 10 milliseconds. If set to 0x0000, scanning will continue until it is explicitly disabled. */
#define MIN_CONNECTION_INTERVAL MSEC_TO_UNITS(20, UNIT_1_25_MS) /**< Determines minimum connection interval in milliseconds. */
#define MAX_CONNECTION_INTERVAL MSEC_TO_UNITS(100, UNIT_1_25_MS) /**< Determines maximum connection interval in milliseconds. */
#define SLAVE_LATENCY 0 /**< Determines slave latency in terms of connection events. */
#define SUPERVISION_TIMEOUT MSEC_TO_UNITS(4000, UNIT_10_MS) /**< Determines supervision time-out in units of 10 milliseconds. */
uint16_t dataLength = 0;
uint16_t reportLength = 0;
uint8_t txPower = 0;
uint8_t rssi = 0;
uint8_t test2[];
uint32_t count = 0;
NRF_BLE_GATT_DEF(m_gatt); /**< GATT module instance. */
BLE_NUS_C_ARRAY_DEF(m_nus_c, NRF_SDH_BLE_CENTRAL_LINK_COUNT); /**< BLE NUS service client instance. */
//BLE_LBS_C_ARRAY_DEF(m_lbs_c, NRF_SDH_BLE_CENTRAL_LINK_COUNT); /**< LED Button client instances. */
BLE_DB_DISCOVERY_ARRAY_DEF(m_db_disc, NRF_SDH_BLE_CENTRAL_LINK_COUNT); /**< Database discovery module instances. */
static char const m_target_periph_name[] = "SWTG1"; /**< Name of the device we try to connect to. This name is searched for in the scan report data*/
static uint8_t m_scan_buffer_data[BLE_GAP_SCAN_BUFFER_MIN]; /**< buffer where advertising reports will be stored by the SoftDevice. */
static uint16_t m_ble_nus_max_data_len = BLE_GATT_ATT_MTU_DEFAULT - OPCODE_LENGTH - HANDLE_LENGTH; /**< Maximum length of data (in bytes) that can be transmitted to the peer by the Nordic UART service module. */
/**@brief Pointer to the buffer where advertising reports will be stored by the SoftDevice. */
static ble_data_t m_scan_buffer =
{
m_scan_buffer_data,
BLE_GAP_SCAN_BUFFER_MIN
};
/**@brief Scan parameters requested for scanning and connection. */
static ble_gap_scan_params_t const m_scan_params =
{
.active = 0, //was 0
.interval = SCAN_INTERVAL,
.window = SCAN_WINDOW,
.timeout = SCAN_DURATION,
.scan_phys = BLE_GAP_PHY_1MBPS,
.filter_policy = BLE_GAP_SCAN_FP_ACCEPT_ALL,
};
/**@brief Connection parameters requested for connection. */
static ble_gap_conn_params_t const m_connection_param =
{
(uint16_t)MIN_CONNECTION_INTERVAL,
(uint16_t)MAX_CONNECTION_INTERVAL,
(uint16_t)SLAVE_LATENCY,
(uint16_t)SUPERVISION_TIMEOUT
};
/**@brief Function to handle asserts in the SoftDevice.
*
* @details This function will be called in case of an assert in the SoftDevice.
*
* @warning This handler is an example only and does not fit a final product. You need to analyze
* how your product is supposed to react in case of Assert.
* @warning On assert from the SoftDevice, the system can only recover on reset.
*
* @param[in] line_num Line number of the failing ASSERT call.
* @param[in] p_file_name File name of the failing ASSERT call.
*/
void assert_nrf_callback(uint16_t line_num, const uint8_t * p_file_name)
{
app_error_handler(0xDEADBEEF, line_num, p_file_name);
}
/**@brief Function for the LEDs initialization.
*
* @details Initializes all LEDs used by the application.
*/
static void leds_init(void)
{
bsp_board_init(BSP_INIT_LEDS);
}
/**@brief Function to start scanning. */
static void scan_start(void)
{
ret_code_t ret;
(void) sd_ble_gap_scan_stop();
NRF_LOG_INFO("Start scanning for device name %s.", (uint32_t)m_target_periph_name);
ret = sd_ble_gap_scan_start(&m_scan_params, &m_scan_buffer);
APP_ERROR_CHECK(ret);
// Turn on the LED to signal scanning.
bsp_board_led_on(CENTRAL_SCANNING_LED);
}
/**@brief Callback handling NUS Client events.
*
* @details This function is called to notify the application of NUS client events.
*
* @param[in] p_ble_nus_c NUS Client Handle. This identifies the NUS client
* @param[in] p_ble_nus_evt Pointer to the NUS Client event.
*/
/**@snippet [Handling events from the ble_nus_c module] */
static void ble_nus_c_evt_handler(ble_nus_c_t * p_ble_nus_c, ble_nus_c_evt_t const * p_ble_nus_evt)
{
ret_code_t err_code;
switch (p_ble_nus_evt->evt_type)
{
case BLE_NUS_C_EVT_DISCOVERY_COMPLETE:
NRF_LOG_INFO("NUS service discovered on conn_handle 0x%x", p_ble_nus_evt->conn_handle);
err_code = ble_nus_c_handles_assign(p_ble_nus_c, p_ble_nus_evt->conn_handle, &p_ble_nus_evt->handles);
APP_ERROR_CHECK(err_code);
err_code = ble_nus_c_tx_notif_enable(p_ble_nus_c);
APP_ERROR_CHECK(err_code);
NRF_LOG_INFO("Connected to device with Nordic UART Service.");
break;
case BLE_NUS_C_EVT_NUS_TX_EVT:
//ble_nus_chars_received_uart_print(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
NRF_LOG_DEBUG("Receiving data.");
NRF_LOG_HEXDUMP_DEBUG(p_ble_nus_evt->p_data, p_ble_nus_evt->data_len);
//NRF_LOG_INFO("Data received : %X", p_ble_nus_evt->p_data);
break;
// case BLE_NUS_C_EVT_DISCONNECTED:
// NRF_LOG_INFO("Disconnected.");
// scan_start();
// break;
}
}
/**@snippet [Handling events from the ble_nus_c module] */
/**@brief Function for handling the advertising report BLE event.
*
* @param[in] p_adv_report Advertising report from the SoftDevice.
*/
static void on_adv_report(ble_gap_evt_adv_report_t const * p_adv_report)
{
ret_code_t err_code;
//NRF_LOG_INFO("report rx'd");
dataLength = p_adv_report->data.len;
reportLength = sizeof(*p_adv_report);
txPower = p_adv_report->tx_power;
rssi = p_adv_report->rssi;
//memcpy(test2, p_adv_report, sizeof(*p_adv_report));
memcpy(test2, p_adv_report->data.p_data, p_adv_report->data.len);
if (ble_advdata_name_find(p_adv_report->data.p_data,
p_adv_report->data.len,
m_target_periph_name))
{
//Test code
NRF_LOG_INFO("Name is a match");
// Name is a match, initiate connection.
err_code = sd_ble_gap_connect(&p_adv_report->peer_addr,
&m_scan_params,
&m_connection_param,
APP_BLE_CONN_CFG_TAG);
if (err_code != NRF_SUCCESS)
{
NRF_LOG_ERROR("Connection Request Failed, reason %d", err_code);
}
}
else
{
//NRF_LOG_INFO("Advertisment wasn't match to %s ", p_adv_report->data.p_data);// m_target_periph_name);
err_code = sd_ble_gap_scan_start(NULL, &m_scan_buffer);
APP_ERROR_CHECK(err_code);
}
}
/**@brief Function for handling BLE events.
*
* @param[in] p_ble_evt Bluetooth stack event.
* @param[in] p_context Unused.
*/
static void ble_evt_handler(ble_evt_t const * p_ble_evt, void * p_context)
{
ret_code_t err_code;
// For readability.
ble_gap_evt_t const * p_gap_evt = &p_ble_evt->evt.gap_evt;
switch (p_ble_evt->header.evt_id)
{
// Upon connection, check which peripheral has connected, initiate DB
// discovery, update LEDs status and resume scanning if necessary.
case BLE_GAP_EVT_CONNECTED:
{
NRF_LOG_INFO("Connection 0x%x established, starting DB discovery.",
p_gap_evt->conn_handle);
APP_ERROR_CHECK_BOOL(p_gap_evt->conn_handle < NRF_SDH_BLE_CENTRAL_LINK_COUNT);
// err_code = ble_lbs_c_handles_assign(&m_lbs_c[p_gap_evt->conn_handle],
// p_gap_evt->conn_handle,
// NULL);
err_code = ble_nus_c_handles_assign(&m_nus_c[p_gap_evt->conn_handle],
p_gap_evt->conn_handle,
NULL);
APP_ERROR_CHECK(err_code);
err_code = ble_db_discovery_start(&m_db_disc[p_gap_evt->conn_handle],
p_gap_evt->conn_handle);
if (err_code != NRF_ERROR_BUSY)
{
APP_ERROR_CHECK(err_code);
}
// Update LEDs status, and check if we should be looking for more
// peripherals to connect to.
bsp_board_led_on(CENTRAL_CONNECTED_LED);
if (ble_conn_state_central_conn_count() == NRF_SDH_BLE_CENTRAL_LINK_COUNT)
{
bsp_board_led_off(CENTRAL_SCANNING_LED);
}
else
{
// Resume scanning.
bsp_board_led_on(CENTRAL_SCANNING_LED);
scan_start();
}
} break; // BLE_GAP_EVT_CONNECTED
// Upon disconnection, reset the connection handle of the peer which disconnected, update
// the LEDs status and start scanning again.
case BLE_GAP_EVT_DISCONNECTED:
{
NRF_LOG_INFO("NUS central link 0x%x disconnected (reason: 0x%x)",
p_gap_evt->conn_handle,
p_gap_evt->params.disconnected.reason);
if (ble_conn_state_central_conn_count() == 0)
{
err_code = app_button_disable();
APP_ERROR_CHECK(err_code);
// Turn off connection indication LED
bsp_board_led_off(CENTRAL_CONNECTED_LED);
}
// Start scanning
scan_start();
// Turn on LED for indicating scanning
bsp_board_led_on(CENTRAL_SCANNING_LED);
} break;
case BLE_GAP_EVT_ADV_REPORT:
on_adv_report(&p_gap_evt->params.adv_report);
break;
case BLE_GAP_EVT_TIMEOUT:
{
// We have not specified a timeout for scanning, so only connection attemps can timeout.
if (p_gap_evt->params.timeout.src == BLE_GAP_TIMEOUT_SRC_CONN)
{
NRF_LOG_DEBUG("Connection request timed out.");
}
} break;
case BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST:
{
NRF_LOG_DEBUG("BLE_GAP_EVT_CONN_PARAM_UPDATE_REQUEST.");
// Accept parameters requested by peer.
err_code = sd_ble_gap_conn_param_update(p_gap_evt->conn_handle,
&p_gap_evt->params.conn_param_update_request.conn_params);
APP_ERROR_CHECK(err_code);
} break;
case BLE_GAP_EVT_PHY_UPDATE_REQUEST:
{
NRF_LOG_DEBUG("PHY update request.");
ble_gap_phys_t const phys =
{
.rx_phys = BLE_GAP_PHY_AUTO,
.tx_phys = BLE_GAP_PHY_AUTO,
};
err_code = sd_ble_gap_phy_update(p_ble_evt->evt.gap_evt.conn_handle, &phys);
APP_ERROR_CHECK(err_code);
} break;
case BLE_GATTC_EVT_TIMEOUT:
{
// Disconnect on GATT Client timeout event.
NRF_LOG_DEBUG("GATT Client Timeout.");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gattc_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
} break;
case BLE_GATTS_EVT_TIMEOUT:
{
// Disconnect on GATT Server timeout event.
NRF_LOG_DEBUG("GATT Server Timeout.");
err_code = sd_ble_gap_disconnect(p_ble_evt->evt.gatts_evt.conn_handle,
BLE_HCI_REMOTE_USER_TERMINATED_CONNECTION);
APP_ERROR_CHECK(err_code);
} break;
default:
// No implementation needed.
break;
}
}
/**@brief Function for initializing the NUS Client. */
static void nus_c_init(void)
{
ret_code_t err_code;
ble_nus_c_init_t nus_c_init_obj;
nus_c_init_obj.evt_handler = ble_nus_c_evt_handler;
for (uint32_t i = 0; i < NRF_SDH_BLE_CENTRAL_LINK_COUNT; i++)
{
err_code = ble_nus_c_init(&m_nus_c[i], &nus_c_init_obj);
APP_ERROR_CHECK(err_code);
}
}
/**@brief Function for initializing the BLE stack.
*
* @details Initializes the SoftDevice and the BLE event interrupts.
*/
static void ble_stack_init(void)
{
ret_code_t err_code;
err_code = nrf_sdh_enable_request();
APP_ERROR_CHECK(err_code);
// Configure the BLE stack using the default settings.
// Fetch the start address of the application RAM.
uint32_t ram_start = 0;
err_code = nrf_sdh_ble_default_cfg_set(APP_BLE_CONN_CFG_TAG, &ram_start);
APP_ERROR_CHECK(err_code);
// Enable BLE stack.
err_code = nrf_sdh_ble_enable(&ram_start);
APP_ERROR_CHECK(err_code);
// Register a handler for BLE events.
NRF_SDH_BLE_OBSERVER(m_ble_observer, APP_BLE_OBSERVER_PRIO, ble_evt_handler, NULL);
}
/**@brief Function for handling events from the button handler module.
*
* @param[in] pin_no The pin that the event applies to.
* @param[in] button_action The button action (press/release).
*/
static void button_event_handler(uint8_t pin_no, uint8_t button_action)
{
ret_code_t err_code;
switch (pin_no)
{
case LEDBUTTON_BUTTON:
NRF_LOG_INFO("Button state %d", button_action);
break;
default:
APP_ERROR_HANDLER(pin_no);
break;
}
}
/**@brief Function for initializing the button handler module.
*/
static void buttons_init(void)
{
ret_code_t err_code;
// The array must be static because a pointer to it will be saved in the button handler module.
static app_button_cfg_t buttons[] =
{
{LEDBUTTON_BUTTON, false, BUTTON_PULL, button_event_handler}
};
err_code = app_button_init(buttons, ARRAY_SIZE(buttons), BUTTON_DETECTION_DELAY);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling database discovery events.
*
* @details This function is callback function to handle events from the database discovery module.
* Depending on the UUIDs that are discovered, this function should forward the events
* to their respective services.
*
* @param[in] p_event Pointer to the database discovery event.
*/
static void db_disc_handler(ble_db_discovery_evt_t * p_evt)
{
NRF_LOG_DEBUG("call to ble_nus_on_db_disc_evt for instance %d and link 0x%x!",
p_evt->conn_handle,
p_evt->conn_handle);
ble_nus_c_on_db_disc_evt(&m_nus_c[p_evt->conn_handle], p_evt);
}
/** @brief Database discovery initialization.
*/
static void db_discovery_init(void)
{
ret_code_t err_code = ble_db_discovery_init(db_disc_handler);
APP_ERROR_CHECK(err_code);
}
/**@brief Function for initializing power management.
*/
static void power_management_init(void)
{
ret_code_t err_code;
err_code = nrf_pwr_mgmt_init();
APP_ERROR_CHECK(err_code);
}
/**@brief Function for handling the idle state (main loop).
*
* @details Handle any pending log operation(s), then sleep until the next event occurs.
*/
static void idle_state_handle(void)
{
if (NRF_LOG_PROCESS() == false)
{
nrf_pwr_mgmt_run();
}
}
/** @brief Function for initializing the log module.
*/
static void log_init(void)
{
ret_code_t err_code = NRF_LOG_INIT(NULL);
APP_ERROR_CHECK(err_code);
NRF_LOG_DEFAULT_BACKENDS_INIT();
}
/** @brief Function for initializing the timer.
*/
static void timer_init(void)
{
ret_code_t err_code = app_timer_init();
APP_ERROR_CHECK(err_code);
}
/**@brief Function for initializing the GATT module.
*/
static void gatt_init(void)
{
ret_code_t err_code = nrf_ble_gatt_init(&m_gatt, NULL);
APP_ERROR_CHECK(err_code);
}
int main(void)
{
// Initialize.
log_init();
timer_init();
leds_init();
buttons_init();
power_management_init();
ble_stack_init();
gatt_init();
db_discovery_init();
// lbs_c_init();
nus_c_init();
ble_conn_state_init();
// Start execution.
NRF_LOG_INFO("Multilink example started.");
scan_start();
for (;;)
{
idle_state_handle();
}
}
