diff --git a/include/ble.h b/include/ble.h
new file mode 100644
index 0000000..8a63e9a
--- /dev/null
+++ b/include/ble.h
@@ -0,0 +1,13 @@
+#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
diff --git a/main/ble.c b/main/ble.c
new file mode 100644
index 0000000..fa5640c
--- /dev/null
+++ b/main/ble.c
@@ -0,0 +1,286 @@
+#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);
+}