From e38eae90e29ac6dc99c96d1d34fd530885ca8326 Mon Sep 17 00:00:00 2001
From: Klaus K Wilting <klaus.k.wilting@deutschebahn.com>
Date: Thu, 24 Sep 2020 22:29:07 +0200
Subject: [PATCH] CWA detection improved (Issue #636)

---
 src/blecsan.cpp | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/blecsan.cpp b/src/blecsan.cpp
index 960825c5..288757a0 100644
--- a/src/blecsan.cpp
+++ b/src/blecsan.cpp
@@ -9,7 +9,7 @@
 // UUID of Exposure Notification Service (ENS)
 // see
 // https://blog.google/documents/70/Exposure_Notification_-_Bluetooth_Specification_v1.2.2.pdf
-static const char ensMagicBytes[] = "\x03\x03\x6F\xfd";
+static const char ensMagicBytes[] = "\x16\x6f\xfd";
 
 // local Tag for logging
 static const char TAG[] = "bluetooth";
@@ -170,7 +170,7 @@ IRAM_ATTR void gap_callback_handler(esp_gap_ble_cb_event_t event,
 
 #if (COUNT_ENS)
       // check for ens signature
-      if (0 == strncmp((const char *)p->scan_rst.ble_adv, ensMagicBytes, 4))
+      if (NULL != strstr((const char *)p->scan_rst.ble_adv, ensMagicBytes))
         cwa_mac_add(hashedmac);
 #endif