Change default security settings to BLE secure connections off.

Fixing some connection issues when enabled, users should enable if desired.

Author: h2zero

examples/NimBLE_Client/main/main.cpp

@@ -261,8 +261,7 @@ extern "C" void app_main(void) {
      *  These are the default values, only shown here for demonstration.
      */
     // NimBLEDevice::setSecurityAuth(false, false, true);
-
-    NimBLEDevice::setSecurityAuth(/*BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM |*/ BLE_SM_PAIR_AUTHREQ_SC);
+    // NimBLEDevice::setSecurityAuth(BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM | BLE_SM_PAIR_AUTHREQ_SC);
 
     /** Optional: set the transmit power */
     NimBLEDevice::setPower(3); /** 3dbm */

examples/NimBLE_Server/main/main.cpp

@@ -142,8 +142,8 @@ extern "C" void app_main(void) {
      *  These are the default values, only shown here for demonstration.
      */
     // NimBLEDevice::setSecurityAuth(false, false, true);
+    // NimBLEDevice::setSecurityAuth(BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM | BLE_SM_PAIR_AUTHREQ_SC);
 
-    NimBLEDevice::setSecurityAuth(/*BLE_SM_PAIR_AUTHREQ_BOND | BLE_SM_PAIR_AUTHREQ_MITM |*/ BLE_SM_PAIR_AUTHREQ_SC);
     pServer = NimBLEDevice::createServer();
     pServer->setCallbacks(&serverCallbacks);
 

src/NimBLEDevice.cpp

@@ -977,7 +977,7 @@ bool NimBLEDevice::init(const std::string& deviceName) {
         ble_hs_cfg.sm_io_cap         = BLE_HS_IO_NO_INPUT_OUTPUT;
         ble_hs_cfg.sm_bonding        = 0;
         ble_hs_cfg.sm_mitm           = 0;
-        ble_hs_cfg.sm_sc             = 1;
+        ble_hs_cfg.sm_sc             = 0;
         ble_hs_cfg.sm_our_key_dist   = BLE_SM_PAIR_KEY_DIST_ENC;
         ble_hs_cfg.sm_their_key_dist = BLE_SM_PAIR_KEY_DIST_ENC;
 # if MYNEWT_VAL(BLE_LL_CFG_FEAT_LL_PRIVACY)