Error receiving blecharacteristic value > 20 bytes written by connected client

[rwel59]

Using Eclipse and ESPIDF most recent code.

ESP32 is set up as client and ble communications work fine in general. When the client (nRF Connect for testing) writes a text value to a characteristic, the callback onWrite event is triggered appropriately. If the value is > 20 bytes, all bytes are successfully read with characteristic.getVal() but I get the following error logged:

E (135716) BT: GATTS_SendRsp conn_id: 3 waiting for op_code = 00

E (135718) BT: Sending response failed