Fix BTS attribute requests

* fix BTS numbers: use 0 to indicate given BTS and 0xFF to indicate all
  BTS' as it's explained in 3GPP TS 52.021 ยง9.3.
* only request attributes from supported (OsmoBTS) types

Change-Id: I8f43055c38000248033a8ff9ddaf0910d68d794b
Related: OS#2317
diff --git a/src/libbsc/abis_nm.c b/src/libbsc/abis_nm.c
index 019d039..cf20d7c 100644
--- a/src/libbsc/abis_nm.c
+++ b/src/libbsc/abis_nm.c
@@ -1590,10 +1590,17 @@
 		     const uint8_t *attr, uint8_t attr_len)
 {
 	struct abis_om_hdr *oh;
-	struct msgb *msg = nm_msgb_alloc();
+	struct msgb *msg;
+
+	if (bts->type != GSM_BTS_TYPE_OSMOBTS) {
+		LOGPC(DNM, LOGL_NOTICE, "Getting attributes from BTS%d type %s is not supported.\n",
+		      bts->nr, btstype2str(bts->type));
+		return -EINVAL;
+	}
 
 	DEBUGP(DNM, "Get Attr (bts=%d)\n", bts->nr);
 
+	msg = nm_msgb_alloc();
 	oh = (struct abis_om_hdr *) msgb_put(msg, ABIS_OM_FOM_HDR_SIZE);
 	fill_om_fom_hdr(oh, attr_len, NM_MT_GET_ATTR, obj_class,
 			bts_nr, trx_nr, ts_nr);
diff --git a/src/libbsc/bsc_init.c b/src/libbsc/bsc_init.c
index 64dcd15..6f80958 100644
--- a/src/libbsc/bsc_init.c
+++ b/src/libbsc/bsc_init.c
@@ -350,12 +350,12 @@
 			generate_cell_chan_list(ca, trx->bts);
 
 			/* Request generic BTS-level attributes */
-			abis_nm_get_attr(trx->bts, NM_OC_BTS, trx->bts->nr, trx->nr, 0xFF, bts_attr, sizeof(bts_attr));
+			abis_nm_get_attr(trx->bts, NM_OC_BTS, 0xFF, 0xFF, 0xFF, bts_attr, sizeof(bts_attr));
 
 			llist_for_each_entry(cur_trx, &trx->bts->trx_list, list) {
 				int i;
 				/* Request TRX-level attributes */
-				abis_nm_get_attr(cur_trx->bts, NM_OC_BASEB_TRANSC, cur_trx->bts->nr, cur_trx->nr, 0xFF,
+				abis_nm_get_attr(cur_trx->bts, NM_OC_BASEB_TRANSC, 0, cur_trx->nr, 0xFF,
 						 trx_attr, sizeof(trx_attr));
 				for (i = 0; i < ARRAY_SIZE(cur_trx->ts); i++)
 					generate_ma_for_ts(&cur_trx->ts[i]);