From e21f6a7f414d1f832e8fddfeaab3b9de05aa3459 Mon Sep 17 00:00:00 2001
From: Jean-François Milants <jf@codingfield.com>
Date: Sun, 11 Jul 2021 16:55:06 +0200
Subject: Notify battery level every 10 minutes when connected to a BLE host.
 Refactor battery percent : only use uint8_t to store the battery % remaining.

---
 src/components/ble/BatteryInformationService.cpp | 8 ++++++--
 src/components/ble/BatteryInformationService.h   | 2 +-
 src/components/ble/NimbleController.cpp          | 6 ++++++
 src/components/ble/NimbleController.h            | 3 ++-
 4 files changed, 15 insertions(+), 4 deletions(-)

(limited to 'src/components/ble')

diff --git a/src/components/ble/BatteryInformationService.cpp b/src/components/ble/BatteryInformationService.cpp
index 10a78d67..7f176904 100644
--- a/src/components/ble/BatteryInformationService.cpp
+++ b/src/components/ble/BatteryInformationService.cpp
@@ -17,7 +17,7 @@ BatteryInformationService::BatteryInformationService(Controllers::Battery& batte
     characteristicDefinition {{.uuid = (ble_uuid_t*) &batteryLevelUuid,
                                .access_cb = BatteryInformationServiceCallback,
                                .arg = this,
-                               .flags = BLE_GATT_CHR_F_READ,
+                               .flags = BLE_GATT_CHR_F_READ | BLE_GATT_CHR_F_NOTIFY,
                                .val_handle = &batteryLevelHandle},
                               {0}},
     serviceDefinition {
@@ -48,4 +48,8 @@ int BatteryInformationService::OnBatteryServiceRequested(uint16_t connectionHand
     return (res == 0) ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
   }
   return 0;
-}
\ No newline at end of file
+}
+void BatteryInformationService::NotifyBatteryLevel(uint16_t connectionHandle, uint8_t level) {
+  auto* om = ble_hs_mbuf_from_flat(&level, 1);
+  ble_gattc_notify_custom(connectionHandle, batteryLevelHandle, om);
+}
diff --git a/src/components/ble/BatteryInformationService.h b/src/components/ble/BatteryInformationService.h
index 7d060909..1303fd6c 100644
--- a/src/components/ble/BatteryInformationService.h
+++ b/src/components/ble/BatteryInformationService.h
@@ -17,7 +17,7 @@ namespace Pinetime {
       void Init();
 
       int OnBatteryServiceRequested(uint16_t connectionHandle, uint16_t attributeHandle, ble_gatt_access_ctxt* context);
-
+      void NotifyBatteryLevel(uint16_t connectionHandle, uint8_t level);
     private:
       Controllers::Battery& batteryController;
       static constexpr uint16_t batteryInformationServiceId {0x180F};
diff --git a/src/components/ble/NimbleController.cpp b/src/components/ble/NimbleController.cpp
index 2c1d0f99..5eb227bf 100644
--- a/src/components/ble/NimbleController.cpp
+++ b/src/components/ble/NimbleController.cpp
@@ -235,3 +235,9 @@ void NimbleController::StartDiscovery() {
 uint16_t NimbleController::connHandle() {
   return connectionHandle;
 }
+
+void NimbleController::NotifyBatteryLevel(uint8_t level) {
+  if(connectionHandle != BLE_HS_CONN_HANDLE_NONE) {
+    batteryInformationService.NotifyBatteryLevel(connectionHandle, level);
+  }
+}
diff --git a/src/components/ble/NimbleController.h b/src/components/ble/NimbleController.h
index 5dd01e42..0cfe983c 100644
--- a/src/components/ble/NimbleController.h
+++ b/src/components/ble/NimbleController.h
@@ -70,6 +70,7 @@ namespace Pinetime {
       };
 
       uint16_t connHandle();
+      void NotifyBatteryLevel(uint8_t level);
 
     private:
       static constexpr const char* deviceName = "InfiniTime";
@@ -92,7 +93,7 @@ namespace Pinetime {
       HeartRateService heartRateService;
 
       uint8_t addrType; // 1 = Random, 0 = PUBLIC
-      uint16_t connectionHandle = 0;
+      uint16_t connectionHandle = BLE_HS_CONN_HANDLE_NONE;
 
       ble_uuid128_t dfuServiceUuid {
         .u {.type = BLE_UUID_TYPE_128},
-- 
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