rx-central-ble/src/main/java/com/uber/rxcentralble/core/CorePeripheral.java [244:254]:
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    synchronized (syncRoot) {
      PeripheralError error = subscribeChecks();
      if (error != null) {
        scopedSubject.onError(error);
        return;
      }

      BluetoothGattCharacteristic characteristic = getCharacteristic(svc, chr);
      if (characteristic == null) {
        scopedSubject.onError(new PeripheralError(MISSING_CHARACTERISTIC));
        return;
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rx-central-ble/src/main/java/com/uber/rxcentralble/core/CorePeripheral.java [318:328]:
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    synchronized (syncRoot) {
      PeripheralError error = subscribeChecks();
      if (error != null) {
        scopedSubject.onError(error);
        return;
      }

      BluetoothGattCharacteristic characteristic = getCharacteristic(svc, chr);
      if (characteristic == null) {
        scopedSubject.onError(new PeripheralError(MISSING_CHARACTERISTIC));
        return;
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