diff --git a/src/utility/ATT.cpp b/src/utility/ATT.cpp
index 9367cfbf..5d920a32 100644
--- a/src/utility/ATT.cpp
+++ b/src/utility/ATT.cpp
@@ -553,6 +553,22 @@ bool ATTClass::disconnect()
numDisconnects++;
+ BLEDevice bleDevice(_peers[i].addressType, _peers[i].address);
+
+ // clear CCCD values on disconnect
+ for (uint16_t att = 0; att < GATT.attributeCount(); att++) {
+ BLELocalAttribute* attribute = GATT.attribute(att);
+
+ if (attribute->type() == BLETypeCharacteristic) {
+ BLELocalCharacteristic* characteristic = (BLELocalCharacteristic*)attribute;
+
+ characteristic->writeCccdValue(bleDevice, 0x0000);
+ }
+ }
+
+ _longWriteHandle = 0x0000;
+ _longWriteValueLength = 0;
+
_peers[i].connectionHandle = 0xffff;
_peers[i].role = 0x00;
_peers[i].addressType = 0x00;
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