host: sm: trigger CB upon error for pair request

Trigger callback upon error for pair request. This is required to verify the expected error status on the upper tester for some PTS tests cases.

Author: guy-m

nimble/host/src/ble_sm.c

@@ -1840,15 +1840,19 @@ ble_sm_pair_req_rx(uint16_t conn_handle, struct os_mbuf **om,
         if (conn->bhc_flags & BLE_HS_CONN_F_MASTER) {
             res->sm_err = BLE_SM_ERR_CMD_NOT_SUPP;
             res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_CMD_NOT_SUPP);
+            res->enc_cb = 1;
         } else if (MYNEWT_VAL(BLE_SM_LVL) == 1) {
             res->sm_err = BLE_SM_ERR_CMD_NOT_SUPP;
             res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_CMD_NOT_SUPP);
+            res->enc_cb = 1;
         } else if (req->max_enc_key_size < BLE_SM_PAIR_KEY_SZ_MIN) {
             res->sm_err = BLE_SM_ERR_ENC_KEY_SZ;
             res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_ENC_KEY_SZ);
+            res->enc_cb = 1;
         } else if (req->max_enc_key_size > BLE_SM_PAIR_KEY_SZ_MAX) {
             res->sm_err = BLE_SM_ERR_INVAL;
             res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_INVAL);
+            res->enc_cb = 1;
         } else if (MYNEWT_VAL(BLE_SM_SC_ONLY)) {
             /* Fail if Secure Connections Only mode is on and remote does not
              * meet key size requirements - MITM was checked in last step.
@@ -1857,13 +1861,16 @@ ble_sm_pair_req_rx(uint16_t conn_handle, struct os_mbuf **om,
             if (!(req->authreq & BLE_SM_PAIR_AUTHREQ_SC)) {
                 res->sm_err = BLE_SM_ERR_AUTHREQ;
                 res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_AUTHREQ);
+                res->enc_cb = 1;
             } else if (req->max_enc_key_size != BLE_SM_PAIR_KEY_SZ_MAX) {
                 res->sm_err = BLE_SM_ERR_ENC_KEY_SZ;
                 res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_ENC_KEY_SZ);
+                res->enc_cb = 1;
             }
         } else if (!ble_sm_verify_auth_requirements(req->authreq)) {
             res->sm_err = BLE_SM_ERR_AUTHREQ;
             res->app_status = BLE_HS_SM_US_ERR(BLE_SM_ERR_AUTHREQ);
+            res->enc_cb = 1;
         } else {
             /* The request looks good.  Precalculate our pairing response and
              * determine some properties of the imminent link.  We need this