SimpleWeather service : new weather implementation

This new implementation of the weather feature provides a new BLE API and a new weather service.
The API uses a single characteristic that allows companion apps to write the weather conditions (current and forecast for the next 5 days).
The SimpleWeather service exposes those data as std::optional fields.

This new implementation replaces the previous WeahterService.

The API is documented in docs/SimpleWeatherService.md.

src/components/ble/SimpleWeatherService.cpp

@@ -0,0 +1,153 @@
+/*  Copyright (C) 2023 Jean-François Milants
+
+    This file is part of InfiniTime.
+
+    InfiniTime is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    InfiniTime is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+#include <algorithm>
+#include "SimpleWeatherService.h"
+#include <cstring>
+#include <nrf_log.h>
+using namespace Pinetime::Controllers;
+
+namespace {
+  enum class MessageType {
+    CurrentWeather,
+    Forecast,
+    Unknown
+  };
+
+  SimpleWeatherService::CurrentWeather CreateCurrentWeather(const uint8_t* dataBuffer) {
+    char cityName[33];
+    std::memcpy(&cityName[0], &dataBuffer[13], 32);
+    cityName[32] = '\0';
+    return SimpleWeatherService::CurrentWeather{dataBuffer[2] + (dataBuffer[3] << 8) + (dataBuffer[4] << 16) + (dataBuffer[5] << 24) +
+        ((uint64_t) dataBuffer[6] << 32) + ((uint64_t) dataBuffer[7] << 40) + ((uint64_t) dataBuffer[8] << 48) +
+        ((uint64_t) dataBuffer[9] << 54),
+        dataBuffer[10],
+        dataBuffer[11],
+        dataBuffer[12],
+        dataBuffer[13 + 32],
+        cityName};
+  }
+
+  SimpleWeatherService::Forecast CreateForecast(const uint8_t* dataBuffer) {
+    uint64_t timestamp = static_cast<uint64_t>(dataBuffer[2] + (dataBuffer[3] << 8) + (dataBuffer[4] << 16) + (dataBuffer[5] << 24) +
+                                               ((uint64_t) dataBuffer[6] << 32) + ((uint64_t) dataBuffer[7] << 40) + ((uint64_t) dataBuffer[8] << 48) +
+                                               ((uint64_t) dataBuffer[9] << 54));
+    uint8_t nbDays = dataBuffer[10];
+    std::array<SimpleWeatherService::Forecast::Day, 5> days;
+    for (int i = 0; i < nbDays; i++) {
+      days[i] = SimpleWeatherService::Forecast::Day {dataBuffer[11 + (i * 3)],
+                                                     dataBuffer[12 + (i * 3)],
+                                                     dataBuffer[13 + (i * 3)]};
+    }
+    return SimpleWeatherService::Forecast {timestamp, nbDays, days};
+  }
+
+  MessageType GetMessageType(const uint8_t* dataBuffer) {
+    switch(dataBuffer[0]) {
+      case 0: return MessageType::CurrentWeather; break;
+      case 1: return MessageType::Forecast; break;
+      default: return MessageType::Unknown; break;
+    }
+  }
+
+  uint8_t GetVersion(const uint8_t* dataBuffer) {
+    return dataBuffer[1];
+  }
+}
+
+int WeatherCallback(uint16_t /*connHandle*/, uint16_t /*attrHandle*/, struct ble_gatt_access_ctxt* ctxt, void* arg) {
+  return static_cast<Pinetime::Controllers::SimpleWeatherService*>(arg)->OnCommand(ctxt);
+}
+
+SimpleWeatherService::SimpleWeatherService(const DateTime& dateTimeController) : dateTimeController(dateTimeController) {
+
+}
+
+void SimpleWeatherService::Init() {
+  ble_gatts_count_cfg(serviceDefinition);
+  ble_gatts_add_svcs(serviceDefinition);
+}
+
+int SimpleWeatherService::OnCommand(struct ble_gatt_access_ctxt* ctxt) {
+  const auto* buffer = ctxt->om;
+  const auto* dataBuffer = buffer->om_data;
+
+  switch(GetMessageType(dataBuffer)) {
+    case MessageType::CurrentWeather:
+      if(GetVersion(dataBuffer) == 0) {
+        currentWeather = CreateCurrentWeather(dataBuffer);
+        NRF_LOG_INFO("Current weather :\n\tTimestamp : %d\n\tTemperature:%d\n\tMin:%d\n\tMax:%d\n\tIcon:%d\n\tLocation:%s",
+                     currentWeather->timestamp,
+                     currentWeather->temperature,
+                     currentWeather->minTemperature,
+                     currentWeather->maxTemperature,
+                     currentWeather->iconId,
+                     currentWeather->location);
+      }
+      break;
+    case MessageType::Forecast:
+      if(GetVersion(dataBuffer) == 0) {
+        forecast = CreateForecast(dataBuffer);
+        NRF_LOG_INFO("Forecast : Timestamp : %d", forecast->timestamp);
+        for(int i = 0; i < 5; i++) {
+          NRF_LOG_INFO("\t[%d] Min: %d - Max : %d - Icon : %d", i, forecast->days[i].minTemperature, forecast->days[i].maxTemperature, forecast->days[i].iconId);
+        }
+      }
+      break;
+    default:
+      break;
+  }
+
+  return 0;
+}
+
+std::optional<SimpleWeatherService::CurrentWeather> SimpleWeatherService::Current() const {
+  if(currentWeather) {
+    auto currentTime = dateTimeController.UTCDateTime().time_since_epoch();
+    auto weatherTpSecond = std::chrono::seconds{currentWeather->timestamp};
+    auto weatherTp = std::chrono::duration_cast<std::chrono::seconds>(weatherTpSecond);
+    auto delta = currentTime - weatherTp;
+
+    if(delta < std::chrono::hours{24}) {
+      return currentWeather;
+    }
+  }
+  return {};
+}
+
+std::optional<SimpleWeatherService::Forecast> SimpleWeatherService::GetForecast() const {
+  if(forecast) {
+    auto currentTime = dateTimeController.UTCDateTime().time_since_epoch();
+    auto weatherTpSecond = std::chrono::seconds{forecast->timestamp};
+    auto weatherTp = std::chrono::duration_cast<std::chrono::seconds>(weatherTpSecond);
+    auto delta = currentTime - weatherTp;
+
+    if(delta < std::chrono::hours{24}) {
+      return this->forecast;
+    }
+  }
+  return {};
+}
+
+bool SimpleWeatherService::CurrentWeather::operator==(const SimpleWeatherService::CurrentWeather& other) const {
+  return this->iconId == other.iconId && this->temperature == other.temperature && this->timestamp == other.timestamp &&
+         this->maxTemperature == other.maxTemperature && this->minTemperature == other.maxTemperature;
+}
+
+bool SimpleWeatherService::CurrentWeather::operator!=(const SimpleWeatherService::CurrentWeather& other) const {
+  return !operator==(other);
+}