Initial code

.gitignore

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-# ---> VisualStudioCode
-.settings
-
-
-# ---> C
-# Object files
-*.o
-*.ko
-*.obj
-*.elf
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Libraries
-*.lib
-*.a
-*.la
-*.lo
-
-# Shared objects (inc. Windows DLLs)
-*.dll
-*.so
-*.so.*
-*.dylib
-
-# Executables
-*.exe
-*.out
-*.app
-*.i*86
-*.x86_64
-*.hex
-
-# Debug files
-*.dSYM/
-
-# ---> C++
-# Compiled Object files
-*.slo
-*.lo
-*.o
-*.obj
-
-# Precompiled Headers
-*.gch
-*.pch
-
-# Compiled Dynamic libraries
-*.so
-*.dylib
-*.dll
-
-# Fortran module files
-*.mod
-
-# Compiled Static libraries
-*.lai
-*.la
-*.a
-*.lib
-
-# Executables
-*.exe
-*.out
-*.app
-
+.pio
+.vscode/.browse.c_cpp.db*
+.vscode/c_cpp_properties.json
+.vscode/launch.json
+.vscode/ipch

.vscode/extensions.json

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+{
+    // See http://go.microsoft.com/fwlink/?LinkId=827846
+    // for the documentation about the extensions.json format
+    "recommendations": [
+        "platformio.platformio-ide"
+    ]
+}

.vscode/settings.json

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+{
+    "files.associations": {
+        "*.config": "ini",
+        "array": "cpp",
+        "*.tcc": "cpp",
+        "deque": "cpp",
+        "string": "cpp",
+        "unordered_map": "cpp",
+        "vector": "cpp",
+        "string_view": "cpp",
+        "memory": "cpp",
+        "initializer_list": "cpp"
+    }
+}

gdbinit

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+ define restart
+     monitor reset 
+     shell sleep 1
+     cont 
+ end
+ 

include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

platformio.ini

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+; PlatformIO Project Configuration File
+;
+;   Build options: build flags, source filter
+;   Upload options: custom upload port, speed and extra flags
+;   Library options: dependencies, extra library storages
+;   Advanced options: extra scripting
+;
+; Please visit documentation for the other options and examples
+; https://docs.platformio.org/page/projectconf.html
+
+[env:adafruit_feather_nrf52840]
+platform = nordicnrf52
+board = adafruit_feather_nrf52840
+framework = arduino
+
+monitor_speed = 115200
+
+upload_protocol = jlink
+build_type = debug 
+debug_extra_cmds = source gdbinit

src/SBrickService.cpp

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+#include "SBrickService.h"
+

src/SBrickService.h

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+#pragma once
+
+#include <bluefruit.h>
+
+namespace FeatherBrick {
+
+    constexpr uint8_t const RemoteControlCommandsUuidBytes[16] = {
+        0x02, 0xb8, 0xcb, 0xcc,
+        0x0e, 0x25,
+        0x4b, 0xda,
+        0x87, 0x90,
+        0xa1, 0x5f, 0x53, 0xe6, 0x01, 0x0f
+    };
+    const BLEUuid RemoteControlCommandsUUID = BLEUuid(RemoteControlCommandsUuidBytes);
+
+    constexpr uint8_t const RemoteControlServiceUuidBytes[16] = {
+        0x4d, 0xc5, 0x91, 0xb0,
+        0x85, 0x7c,
+        0x41, 0xde,
+        0xb5, 0xf1,
+        0x15, 0xab, 0xda, 0x66, 0x5b, 0x0c
+    };
+    const BLEUuid RemoteControlServiceUUID = BLEUuid(RemoteControlServiceUuidBytes);
+
+    class RemoteControlCommandsCharacteristic: public BLECharacteristic {
+        public:
+            RemoteControlCommandsCharacteristic(): BLECharacteristic(RemoteControlCommandsUUID) {}
+    };
+
+    class RemoteControlService: public BLEService {
+        public:
+            RemoteControlService(): BLEService(RemoteControlServiceUUID) {}
+
+            void setCommandCallback(BLECharacteristic::write_cb_t cb) {
+                Rccc.setWriteCallback(cb);
+            }
+
+            err_t begin() {
+                err_t _error = BLEService::begin();
+                if (_error == ERROR_NONE) {
+                    Rccc.setProperties(CHR_PROPS_READ
+                        | CHR_PROPS_WRITE
+                        | CHR_PROPS_WRITE_WO_RESP
+                        | CHR_PROPS_NOTIFY
+                    );
+                    Rccc.setMaxLen(20);
+                    Rccc.begin();
+                }
+                return _error;
+            }
+        private:
+            RemoteControlCommandsCharacteristic Rccc;
+    };
+
+}

src/main.cpp

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+#include <Arduino.h>
+#include <bluefruit.h>
+#include "SBrickService.h"
+
+BLEDfu ble_dfu;
+BLEDis ble_dis;
+FeatherBrick::RemoteControlService ble_rccs;
+
+void startAdvertising();
+void connectCB(uint16_t conn_handle);
+void commandCB(uint16_t conn_hdl, BLECharacteristic* chr, uint8_t* data, uint16_t len);
+
+void setup() {
+  Serial.begin(115200);
+  while (!Serial)
+    delay(10); // for nrf52840 with native usb
+
+  Serial.println("SBrick");
+  Serial.println("--------------------------------");
+
+
+  // Init Bluefruit
+  Bluefruit.begin();
+  Bluefruit.setTxPower(4); // Check bluefruit.h for supported values
+  Bluefruit.setName("SBrick");
+  Bluefruit.Periph.setConnectCallback(connectCB);
+
+  // To be consistent OTA DFU should be added first if it exists
+  ble_dfu.begin();
+
+  // Configure and Start Device Information Service
+  ble_dis.setManufacturer("Vengit Ltd.");
+  ble_dis.setModel("00");
+  ble_dis.setSoftwareRev("13.26");
+  ble_dis.setHardwareRev("13.0");
+  ble_dis.begin();
+
+  // Remote Control Service
+  ble_rccs.setCommandCallback(commandCB);
+  ble_rccs.begin();
+
+  startAdvertising();
+}
+
+void loop() {
+  // if (Bluefruit.connected() && bleuart.notifyEnabled()) {
+  //   blecobs.update();
+  //   if (blecobs.overflow()) {
+  //     Serial.print("blecobs OVERFLOW!");
+  //   }
+  // }
+}
+
+void startAdvertising() {
+  Bluefruit.Advertising.addFlags(BLE_GAP_ADV_FLAGS_LE_ONLY_GENERAL_DISC_MODE);
+  Bluefruit.Advertising.addTxPower();
+  Bluefruit.Advertising.addService(ble_rccs);
+  Bluefruit.ScanResponse.addName();
+
+  /* Start Advertising
+   * - Enable auto advertising if disconnected
+   * - Interval:  fast mode = 20 ms, slow mode = 152.5 ms
+   * - Timeout for fast mode is 30 seconds
+   * - Start(timeout) with timeout = 0 will advertise forever (until connected)
+   *
+   * For recommended advertising interval
+   * https://developer.apple.com/library/content/qa/qa1931/_index.html
+   */
+  Bluefruit.Advertising.restartOnDisconnect(true);
+  Bluefruit.Advertising.setInterval(32, 244); // in unit of 0.625 ms
+  Bluefruit.Advertising.setFastTimeout(30);   // number of seconds in fast mode
+  Bluefruit.Advertising.start(0); // 0 = Don't stop advertising after n seconds
+}
+
+void connectCB(uint16_t conn_handle) {
+  BLEConnection *connection = Bluefruit.Connection(conn_handle);
+  char central_name[32] = {0};
+  connection->getPeerName(central_name, sizeof(central_name));
+
+  Serial.print("Connected to ");
+  Serial.println(central_name);
+}
+
+void commandCB(uint16_t conn_hdl, BLECharacteristic* chr, uint8_t* data, uint16_t len) {
+  Serial.print("Chr write: ");
+  Serial.printBuffer(data,len);
+}

test/README

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+
+This directory is intended for PlatformIO Unit Testing and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/page/plus/unit-testing.html