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BLE functionality

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This commit is contained in:
Morgan 'ARR\!' Allen 2020-04-22 22:23:02 -07:00
parent f2badd9234
commit 68b95b03ce
2 changed files with 299 additions and 0 deletions
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include/ble.h Normal file
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#ifndef __BLE_H_H
#define __BLE_H_H
typedef int (*event_callback_t)(struct ble_gap_event *, void *);
typedef struct {
uint32_t *handle;
event_callback_t callback;
} event_callback_handle_t;
void ble_init();
#endif

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main/ble.c Normal file
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "freertos/event_groups.h"
#include "esp_system.h"
#include "esp_nimble_hci.h"
#include "nimble/nimble_port.h"
#include "nimble/nimble_port_freertos.h"
#include "host/ble_hs.h"
#include "host/util/util.h"
#include "services/gap/ble_svc_gap.h"
#include "services/bas/ble_svc_bas.h"
#include "main.h"
#include "ble.h"
#include "esp32-lora.h"
#define TAG "BLE"
#define CONFIG_CACO_MAX_SERVICES (10)
#define CACO_BLE_ADV_PERIOD (4000)
static const char *device_name = "LoRaComm";
static uint8_t blehr_addr_type;
static uint8_t callback_handler_count = 0;
static uint16_t conn_handle;
static event_callback_handle_t callback_handlers[CONFIG_CACO_MAX_SERVICES] = { 0 };
static int ble_gap_event(struct ble_gap_event *event, void *arg);
static uint16_t ble_svc_handle;
static int ble_svc_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
#define BLE_SERVICE_LORA (0x4200)
#define BLE_SERVICE_LORA_BW (0x4201)
#define BLE_SERVICE_LORA_CR (0x4202)
#define BLE_SERVICE_LORA_SF (0x4203)
#define BLE_SERVICE_LORA_PRE (0x4204)
#define BLE_SERVICE_LORA_TX (0x4205)
#define BLE_SERVICE_LORA_RX (0x4206)
#define BLE_SERVICE_LORA_FREQ (0x4207)
static const struct ble_gatt_svc_def service_defs[] = {{
.type = BLE_GATT_SVC_TYPE_PRIMARY,
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA),
.characteristics = (struct ble_gatt_chr_def[]) { {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_BW),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_CR),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_SF),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_PRE),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_TX),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_RX),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_READ
}, {
.uuid = BLE_UUID16_DECLARE(BLE_SERVICE_LORA_FREQ),
.access_cb = ble_svc_access,
.val_handle = &ble_svc_handle,
.flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ
}, {
0, /* No more characteristics in this service. */
} },
},
{ 0 }
};
static int ble_svc_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
uint16_t uuid16 = ble_uuid_u16(ctxt->chr->uuid);
esp_err_t err = ble_gatts_count_cfg(service_defs);
ESP_LOGI(TAG, "0x%02X access: %d", uuid16, ctxt->op);
switch(uuid16) {
case BLE_SERVICE_LORA_BW:
os_mbuf_append(ctxt->om, (void*)&lora.bandwidth, 1);
break;
case BLE_SERVICE_LORA_CR:
os_mbuf_append(ctxt->om, (void*)&lora.codingRate, 1);
break;
case BLE_SERVICE_LORA_SF:
os_mbuf_append(ctxt->om, (void*)&lora.spreadingFactor, 1);
break;
case BLE_SERVICE_LORA_FREQ:
os_mbuf_append(ctxt->om, (void*)&lora.frequency, 1);
break;
case 0x2901:
os_mbuf_append(ctxt->om, "hello", 5);
break;
}
return 0;
}
static void ble_advertise(void) {
struct ble_gap_adv_params adv_params;
struct ble_hs_adv_fields fields;
int rc;
/*
* Set the advertisement data included in our advertisements:
* o Flags (indicates advertisement type and other general info)
* o Advertising tx power
* o Device name
*/
memset(&fields, 0, sizeof(fields));
/*
* Advertise two flags:
* o Discoverability in forthcoming advertisement (general)
* o BLE-only (BR/EDR unsupported)
*/
fields.flags = BLE_HS_ADV_F_DISC_GEN |
BLE_HS_ADV_F_BREDR_UNSUP;
/*
* Indicate that the TX power level field should be included; have the
* stack fill this value automatically. This is done by assigning the
* special value BLE_HS_ADV_TX_PWR_LVL_AUTO.
*/
fields.tx_pwr_lvl_is_present = 1;
fields.tx_pwr_lvl = BLE_HS_ADV_TX_PWR_LVL_AUTO;
fields.name = (uint8_t *)device_name;
fields.name_len = strlen(device_name);
fields.name_is_complete = 1;
rc = ble_gap_adv_set_fields(&fields);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error setting advertisement data; rc=%d\n", rc);
return;
}
/* Begin advertising */
memset(&adv_params, 0, sizeof(adv_params));
adv_params.conn_mode = BLE_GAP_CONN_MODE_UND;
adv_params.disc_mode = BLE_GAP_DISC_MODE_GEN;
rc = ble_gap_adv_start(blehr_addr_type, NULL, BLE_HS_FOREVER,
&adv_params, ble_gap_event, NULL);
if (rc != 0) {
MODLOG_DFLT(ERROR, "error enabling advertisement; rc=%d\n", rc);
return;
}
}
static int ble_gap_event(struct ble_gap_event *event, void *arg) {
uint8_t i = 0;
switch (event->type) {
case BLE_GAP_EVENT_CONNECT:
/* A new connection was established or a connection attempt failed */
MODLOG_DFLT(INFO, "connection %s; status=%d\n",
event->connect.status == 0 ? "established" : "failed",
event->connect.status);
if (event->connect.status != 0) {
/* Connection failed; resume advertising */
ble_advertise();
}
conn_handle = event->connect.conn_handle;
break;
case BLE_GAP_EVENT_DISCONNECT:
ESP_LOGI(TAG, "disconnect; reason=%d\n", event->disconnect.reason);
/* Connection terminated; resume advertising */
ble_advertise();
break;
case BLE_GAP_EVENT_ADV_COMPLETE:
ESP_LOGI(TAG, "adv complete\n");
ble_advertise();
break;
case BLE_GAP_EVENT_SUBSCRIBE:
ESP_LOGI(TAG, "handling BLE_GAP_EVENT_SUBSCRIBE");
ESP_LOGI(TAG, "attr_handle: %d", event->subscribe.attr_handle);
ESP_LOGI(TAG, "callback_handler_count: %d", callback_handler_count);
for(i = 0; (i < CONFIG_CACO_MAX_SERVICES); i++) {
if(callback_handlers[i].handle != NULL) continue;
ESP_LOGI(TAG, "callback_handler: %d", (uint32_t)(callback_handlers[i].handle));
if (event->subscribe.attr_handle == (uint32_t)(*callback_handlers[i].handle)) {
callback_handlers[i].callback(event, arg);
}
}
break;
case BLE_GAP_EVENT_CONN_UPDATE:
ESP_LOGI(TAG, "BLE_GAP_EVENT_CONN_UPDATE, status: %d", event->enc_change.status);
break;
case BLE_GAP_EVENT_ENC_CHANGE:
ESP_LOGI(TAG, "BLE_GAP_EVENT_ENC_CHANGE");
break;
case BLE_GAP_EVENT_MTU:
ESP_LOGI(TAG, "mtu update event; conn_handle=%d mtu=%d\n",
event->mtu.conn_handle,
event->mtu.value);
break;
}
return 0;
}
static void on_sync() {
ESP_LOGI(TAG, "on_sync");
int err;
err = ble_hs_id_infer_auto(0, &blehr_addr_type);
ESP_ERROR_CHECK(err);
uint8_t addr_val[6] = {0};
err = ble_hs_id_copy_addr(blehr_addr_type, addr_val, NULL);
ESP_ERROR_CHECK(err);
ble_advertise();
}
static void on_reset(int reason) {
ESP_LOGI(TAG, "on_reset, reason: %d", reason);
}
void nimble_host_task(void *param) {
nimble_port_run();
}
void ble_init() {
esp_err_t err;
memset(&callback_handlers, 0, sizeof(event_callback_handle_t) * CONFIG_CACO_MAX_SERVICES);
ESP_ERROR_CHECK(esp_nimble_hci_and_controller_init());
nimble_port_init();
ble_hs_cfg.sync_cb = on_sync;
ble_hs_cfg.reset_cb = on_reset;
// initialize services
err = ble_gatts_count_cfg(service_defs);
ESP_ERROR_CHECK(err);
err = ble_gatts_add_svcs(service_defs);
ESP_ERROR_CHECK(err);
err = ble_svc_gap_device_name_set(device_name);
ESP_ERROR_CHECK(err);
nimble_port_freertos_init(nimble_host_task);
}