familiarization demo code

part 1

Author: fabiankuffer

.gitignore

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+build/
+sdkconfig
+sdkconfig.old

.vscode/c_cpp_properties.json

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+{
+    "configurations": [
+        {
+            "name": "Linux",
+            "includePath": [
+                "${workspaceFolder}/**",
+                "${workspaceFolder}/build/config/**",
+                "${env:HOME}/esp/esp-idf/**"
+            ],
+            "defines": [],
+            "compilerPath": "/usr/bin/gcc",
+            "cStandard": "gnu17",
+            "cppStandard": "gnu++17",
+            "intelliSenseMode": "linux-gcc-x64"
+        }
+    ],
+    "version": 4
+}

.vscode/settings.json

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+{
+    "idf.adapterTargetName": "esp32",
+    "idf.port": "/dev/ttyUSB0",
+    "idf.flashType": "UART"
+}

CMakeLists.txt

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+# For more information about build system see
+# https://docs.espressif.com/projects/esp-idf/en/latest/api-guides/build-system.html
+# The following five lines of boilerplate have to be in your project's
+# CMakeLists in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(SimLinkSoftware)

README.md

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-# Software
+# Main ESP32 Code

links

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+github.com/apache/mynewt-nimble/blob/master/apps/bleprph/src/main.c
+github.com/apache/mynewt-nimble/blob/master/apps/blehr/src/main.c
+github.com/espressif/esp-idf/blob/master/examples/bluetooth/nimble/blehr/main/main.c
+github.com/espressif/esp-idf/blob/master/examples/bluetooth/nimble/bleprph/main/main.c
+mynewt.apache.org/latest/network/ble_hs/ble_att.html
+docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/nimble.index.html
+https://iotespresso.com/esp32-nimble-how-to-send-notifications/

main/CMakeLists.txt

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+set(srcs "main.cpp"
+         "functions.cpp")
+
+idf_component_register(SRCS "${srcs}"
+                    INCLUDE_DIRS ".")
+
+#hier muss kein required oder ähnliches rein, weil main alles required

main/functions.cpp

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+#include "main.hpp"
+
+void bleprph_host_task(void *param){
+    ESP_LOGI(tag, "BLE Host Task Started");
+    /*This function will return only when nimble_port_stop() is executed*/
+    nimble_port_run();
+
+    nimble_port_freertos_deinit();
+}
+
+static void bleprhp_on_reset(int reason){
+    ESP_LOGE(tag, "Resetting state; reason=%d\n",reason);
+}
+
+static void bleprhp_on_sync(void){
+    //save return code
+    int rc;
+
+    /*use privacy*/
+    rc = ble_hs_id_infer_auto(0, &bleprhp_addr_type);
+    assert(rc == 0);
+
+    //TODO
+    //bleprhp_advertise();
+}

main/main.cpp

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+#include "main.hpp"
+
+extern "C" void app_main(void)
+{
+    //returncodes von nimble functionen zwischenspeichern --> geben viele informationen über den status der funktionen
+    //mynewt.apache.org/latest/network/ble_hs/ble_hs_return_codes.html
+    int rc;
+
+    /*Initialize NVS - it is used to store PHY calibration data*/
+    //Ablauf ist in esp idf beschrieben
+    //docs.espressif.com/projects/esp-idf/en/latest/esp32/api-reference/bluetooth/nimble/index.html
+    esp_err_t ret = nvs_flash_init();
+    if (ret == ESP_ERR_NVS_NO_FREE_PAGES || ret == ESP_ERR_NVS_NEW_VERSION_FOUND){
+        ESP_ERROR_CHECK(nvs_flash_erase());
+        ret = nvs_flash_init();
+    }
+    ESP_ERROR_CHECK(ret);
+
+    nimble_port_init();
+    /*Initialize the NimBLE host configuration.*/
+    ble_hs_cfg.sync_cb = bleprhp_on_sync;
+    ble_hs_cfg.reset_cb = bleprhp_on_reset;
+    /*Security Manager local input output capabilities*/
+    ble_hs_cfg.sm_io_cap = BLE_SM_IO_CAP_DISP_YES_NO;
+    /*security Manager bond flag
+    if set proper flag in Pairing request/response will be set. This results in storing keys distributed during bonding.*/
+    ble_hs_cfg.sm_bonding = 1;
+    /*security manager mitm flag
+    if set proper flag in pairing request/response will be set. This results in requiring man-in-the-middle protection when pairing.*/
+    ble_hs_cfg.sm_mitm = 1;
+    /*Security Manager secure connections flag
+    if set proper flag in pairing request/response will be set. this results in using LE Secure Connections for pairing if also supported by remote device. Fallback to legacy pairing if not supported by remote.*/
+    ble_hs_cfg.sm_sc = 1;
+    /*Security Manager Local Key Distribution Mask*/
+    ble_hs_cfg.sm_our_key_dist = 1;
+    /*Security Manager Remote Key Distribution Mask*/
+    ble_hs_cfg.sm_their_key_dist = 1;
+
+    //TODO
+    //rc = gatt_svr_init();
+    assert(rc == 0);
+
+    /*Set the default device name. */
+    rc = ble_svc_gap_device_name_set(CONFIG_BT_NIMBLE_SVC_GAP_DEVICE_NAME);
+    assert(rc == 0);
+
+    nimble_port_freertos_init(bleprph_host_task);
+}

main/main.hpp

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+#ifndef H_MAIN
+#define H_MAIN
+
+#include <cstdlib>
+#include <stdio.h>
+#include "freertos/FreeRTOS.h"
+#include "freertos/task.h"
+#include "sdkconfig.h"
+#include "esp_log.h"
+
+//esp32
+#include "nvs_flash.h"
+#include "nimble/nimble_port.h"
+#include "nimble/nimble_port_freertos.h"
+#include "host/ble_hs.h"
+#include "services/gap/ble_svc_gap.h"
+
+extern "C" {
+
+static const char *tag = "SimLinkModule_BLE";
+
+static uint8_t bleprhp_addr_type;
+
+//start nimble in a task
+void bleprph_host_task(void *param);
+//This callback is executed when the host resets itself and the controller
+static void bleprhp_on_reset(int reason);
+//This callback is executed when the host and controller become synced. This happens at startup and after a reset
+static void bleprhp_on_sync(void);
+}
+
+#endif