apps/bttester: add btp command to configure security mode and level

This adds command to configure security mode and level. For now, this can't
be done dynamically, we can just check if our settings comply with provided
mode and level. This is needed for various GAP/SEC/SEM qualification test cases.

Author: piotrnarajowski

apps/bttester/src/btp/btp_gap.h

@@ -339,6 +339,12 @@ struct gap_subrate_request_cmd {
     uint16_t supervision_timeout;
 } __packed;
 
+#define GAP_CONFIGURE_SECURITY_MODE 0x2f
+struct gap_configure_security_mode_cmd {
+    uint8_t mode;
+    uint8_t level;
+} __packed;
+
 /* events */
 #define BTP_GAP_EV_NEW_SETTINGS        0x80
 struct btp_gap_new_settings_ev {

apps/bttester/src/btp_gap.c

@@ -2270,6 +2270,36 @@ subrate_request(const void *cmd, uint16_t cmd_len, void *rsp, uint16_t *rsp_len)
 }
 #endif
 
+static uint8_t
+configure_security_mode(const void *cmd, uint16_t cmd_len,
+                        void *rsp, uint16_t *rsp_len)
+{
+    const struct gap_configure_security_mode_cmd *cp = cmd;
+
+    switch (cp->mode) {
+    case 1:
+        if (cp->level != MYNEWT_VAL(BLE_SM_LVL)) {
+            return BTP_STATUS_FAILED;
+        }
+        break;
+
+    case 2:
+        /* Data signing is not supported */
+        return BTP_STATUS_FAILED;
+
+    case 3:
+        if (cp->level != 1) {
+            /* Broadcast code encryption (lvl 2,3) is not supported */
+            return BTP_STATUS_FAILED;
+        }
+        break;
+    }
+
+    SYS_LOG_DBG("");
+
+    return BTP_STATUS_SUCCESS;
+}
+
 static const struct btp_handler handlers[] = {
     {
         .opcode = BTP_GAP_READ_SUPPORTED_COMMANDS,
@@ -2447,6 +2477,11 @@ static const struct btp_handler handlers[] = {
         .func = subrate_request,
     },
 #endif
+    {
+        .opcode = GAP_CONFIGURE_SECURITY_MODE,
+        .expect_len = sizeof(struct gap_configure_security_mode_cmd),
+        .func = configure_security_mode,
+    },
 };
 
 static void