[FL-2441] BLE add Power state, fix double connection (#1238)

* battery service: add power state charachteristic
* bt: update power state on charging / discharging events
* ble config: support only one connection
* bt: always update flow control characteristic
* bt: fix power state update
* bt: simplify updating power state
* bt: don't update flow control charachteristic

firmware/targets/f7/ble_glue/app_conf.h

@@ -127,7 +127,7 @@
  * Maximum number of simultaneous connections that the device will support.
  * Valid values are from 1 to 8
  */
-#define CFG_BLE_NUM_LINK 2
+#define CFG_BLE_NUM_LINK 1
 
 /**
  * Maximum number of Services that can be stored in the GATT database.

firmware/targets/f7/ble_glue/battery_service.c

@@ -3,18 +3,50 @@
 #include "ble.h"
 
 #include <furi.h>
+#include <furi_hal_power.h>
 
 #define TAG "BtBatterySvc"
 
 typedef struct {
     uint16_t svc_handle;
-    uint16_t char_level_handle;
+    uint16_t battery_level_char_handle;
+    uint16_t power_state_char_handle;
 } BatterySvc;
 
+enum {
+    // Common states
+    BatterySvcPowerStateUnknown = 0b00,
+    BatterySvcPowerStateUnsupported = 0b01,
+    // Level states
+    BatterySvcPowerStateGoodLevel = 0b10,
+    BatterySvcPowerStateCriticallyLowLevel = 0b11,
+    // Charging states
+    BatterySvcPowerStateNotCharging = 0b10,
+    BatterySvcPowerStateCharging = 0b11,
+    // Discharging states
+    BatterySvcPowerStateNotDischarging = 0b10,
+    BatterySvcPowerStateDischarging = 0b11,
+    // Battery states
+    BatterySvcPowerStateBatteryNotPresent = 0b10,
+    BatterySvcPowerStateBatteryPresent = 0b11,
+};
+
+typedef struct {
+    uint8_t present : 2;
+    uint8_t discharging : 2;
+    uint8_t charging : 2;
+    uint8_t level : 2;
+} BattrySvcPowerState;
+
+_Static_assert(sizeof(BattrySvcPowerState) == 1, "Incorrect structure size");
+
 static BatterySvc* battery_svc = NULL;
 
+#define BATTERY_POWER_STATE (0x2A1A)
+
 static const uint16_t service_uuid = BATTERY_SERVICE_UUID;
-static const uint16_t char_battery_level_uuid = BATTERY_LEVEL_CHAR_UUID;
+static const uint16_t battery_level_char_uuid = BATTERY_LEVEL_CHAR_UUID;
+static const uint16_t power_state_char_uuid = BATTERY_POWER_STATE;
 
 void battery_svc_start() {
     battery_svc = malloc(sizeof(BatterySvc));
@@ -22,7 +54,7 @@ void battery_svc_start() {
 
     // Add Battery service
     status = aci_gatt_add_service(
-        UUID_TYPE_16, (Service_UUID_t*)&service_uuid, PRIMARY_SERVICE, 4, &battery_svc->svc_handle);
+        UUID_TYPE_16, (Service_UUID_t*)&service_uuid, PRIMARY_SERVICE, 8, &battery_svc->svc_handle);
     if(status) {
         FURI_LOG_E(TAG, "Failed to add Battery service: %d", status);
     }
@@ -30,24 +62,47 @@ void battery_svc_start() {
     status = aci_gatt_add_char(
         battery_svc->svc_handle,
         UUID_TYPE_16,
-        (Char_UUID_t*)&char_battery_level_uuid,
+        (Char_UUID_t*)&battery_level_char_uuid,
         1,
         CHAR_PROP_READ | CHAR_PROP_NOTIFY,
         ATTR_PERMISSION_AUTHEN_READ,
         GATT_DONT_NOTIFY_EVENTS,
         10,
         CHAR_VALUE_LEN_CONSTANT,
-        &battery_svc->char_level_handle);
+        &battery_svc->battery_level_char_handle);
     if(status) {
         FURI_LOG_E(TAG, "Failed to add Battery level characteristic: %d", status);
     }
+    // Add Power state characteristic
+    status = aci_gatt_add_char(
+        battery_svc->svc_handle,
+        UUID_TYPE_16,
+        (Char_UUID_t*)&power_state_char_uuid,
+        1,
+        CHAR_PROP_READ | CHAR_PROP_NOTIFY,
+        ATTR_PERMISSION_AUTHEN_READ,
+        GATT_DONT_NOTIFY_EVENTS,
+        10,
+        CHAR_VALUE_LEN_CONSTANT,
+        &battery_svc->power_state_char_handle);
+    if(status) {
+        FURI_LOG_E(TAG, "Failed to add Battery level characteristic: %d", status);
+    }
+    // Update power state charachteristic
+    battery_svc_update_power_state();
 }
 
 void battery_svc_stop() {
     tBleStatus status;
     if(battery_svc) {
         // Delete Battery level characteristic
-        status = aci_gatt_del_char(battery_svc->svc_handle, battery_svc->char_level_handle);
+        status =
+            aci_gatt_del_char(battery_svc->svc_handle, battery_svc->battery_level_char_handle);
+        if(status) {
+            FURI_LOG_E(TAG, "Failed to delete Battery level characteristic: %d", status);
+        }
+        // Delete Power state characteristic
+        status = aci_gatt_del_char(battery_svc->svc_handle, battery_svc->power_state_char_handle);
         if(status) {
             FURI_LOG_E(TAG, "Failed to delete Battery level characteristic: %d", status);
         }
@@ -73,9 +128,39 @@ bool battery_svc_update_level(uint8_t battery_charge) {
     // Update battery level characteristic
     FURI_LOG_D(TAG, "Updating battery level characteristic");
     tBleStatus result = aci_gatt_update_char_value(
-        battery_svc->svc_handle, battery_svc->char_level_handle, 0, 1, &battery_charge);
+        battery_svc->svc_handle, battery_svc->battery_level_char_handle, 0, 1, &battery_charge);
     if(result) {
         FURI_LOG_E(TAG, "Failed updating RX characteristic: %d", result);
     }
     return result != BLE_STATUS_SUCCESS;
 }
+
+bool battery_svc_update_power_state() {
+    // Check if service was started
+    if(battery_svc == NULL) {
+        return false;
+    }
+    // Update power state characteristic
+    BattrySvcPowerState power_state = {
+        .level = BatterySvcPowerStateUnsupported,
+        .present = BatterySvcPowerStateBatteryPresent,
+    };
+    if(furi_hal_power_is_charging()) {
+        power_state.charging = BatterySvcPowerStateCharging;
+        power_state.discharging = BatterySvcPowerStateNotDischarging;
+    } else {
+        power_state.charging = BatterySvcPowerStateNotCharging;
+        power_state.discharging = BatterySvcPowerStateDischarging;
+    }
+    FURI_LOG_D(TAG, "Updating power state characteristic");
+    tBleStatus result = aci_gatt_update_char_value(
+        battery_svc->svc_handle,
+        battery_svc->power_state_char_handle,
+        0,
+        1,
+        (uint8_t*)&power_state);
+    if(result) {
+        FURI_LOG_E(TAG, "Failed updating Power state characteristic: %d", result);
+    }
+    return result != BLE_STATUS_SUCCESS;
+}

firmware/targets/f7/ble_glue/battery_service.h

@@ -15,6 +15,8 @@ bool battery_svc_is_started();
 
 bool battery_svc_update_level(uint8_t battery_level);
 
+bool battery_svc_update_power_state();
+
 #ifdef __cplusplus
 }
 #endif