bluetooth: tester: Use define for variable length BTP commands

This makes code a bit easier to follow.

apps/bttester/src/btp/bttester.h

@@ -77,6 +77,11 @@ tester_rsp_full(uint8_t service, uint8_t opcode, const void *rsp, size_t len);
 void
 tester_event(uint8_t service, uint8_t opcode, const void *data, size_t len);
 
+/* Used to indicate that command length is variable and that validation will
+ * be done in handler.
+ */
+#define BTP_HANDLER_LENGTH_VARIABLE (-1)
+
 struct btp_handler {
     uint8_t opcode;
     uint8_t index;

apps/bttester/src/btp_gap.c

@@ -1801,7 +1801,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GAP_START_ADVERTISING,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = start_advertising,
     },
     {
@@ -1886,7 +1886,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GAP_SET_FILTER_ACCEPT_LIST,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = set_filter_accept_list,
     },
 };

apps/bttester/src/btp_gatt.c

@@ -1918,7 +1918,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATT_DISC_PRIM_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = disc_prim_uuid,
     },
     {
@@ -1933,7 +1933,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATT_DISC_CHRC_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = disc_chrc_uuid,
     },
     {
@@ -1953,7 +1953,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATT_READ_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = read_uuid,
     },
     {
@@ -1963,34 +1963,34 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATT_READ_MULTIPLE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = read_multiple,
     },
     {
         .opcode = BTP_GATT_WRITE_WITHOUT_RSP,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_without_rsp,
     },
 #if 0
     {
         .opcode = BTP_GATT_SIGNED_WRITE_WITHOUT_RSP,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_signed_without_rsp,
     },
 #endif
     {
         .opcode = BTP_GATT_WRITE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_data,
     },
     {
         .opcode = BTP_GATT_WRITE_LONG,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_long,
     },
     {
         .opcode = BTP_GATT_RELIABLE_WRITE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = reliable_write,
     },
     {
@@ -2005,7 +2005,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATT_GET_ATTRIBUTES,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = get_attrs,
     },
     {

apps/bttester/src/btp_gatt_cl.c

@@ -1459,7 +1459,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATTC_DISC_PRIM_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = disc_prim_uuid,
     },
     {
@@ -1474,7 +1474,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATTC_DISC_CHRC_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = disc_chrc_uuid,
     },
     {
@@ -1489,7 +1489,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATTC_READ_UUID,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = read_uuid,
     },
     {
@@ -1499,34 +1499,34 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_GATTC_READ_MULTIPLE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = read_multiple,
     },
     {
         .opcode = BTP_GATTC_WRITE_WITHOUT_RSP,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_without_rsp,
     },
 #if 0
     {
         .opcode = BTP_GATTC_SIGNED_WRITE_WITHOUT_RSP,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_signed_without_rsp,
     },
 #endif
     {
         .opcode = BTP_GATTC_WRITE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write,
     },
     {
         .opcode = BTP_GATTC_WRITE_LONG,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = write_long,
     },
     {
         .opcode = BTP_GATTC_RELIABLE_WRITE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = reliable_write,
     },
     {

apps/bttester/src/btp_l2cap.c

@@ -727,7 +727,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_L2CAP_SEND_DATA,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = send_data,
     },
     {
@@ -737,7 +737,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_L2CAP_RECONFIGURE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = reconfigure,
     },
     {

apps/bttester/src/btp_mesh.c

@@ -837,12 +837,12 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_MESH_CONFIG_PROVISIONING,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = config_prov,
     },
     {
         .opcode = BTP_MESH_PROVISION_NODE,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = provision_node,
     },
     {
@@ -862,7 +862,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_MESH_INPUT_STRING,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = input_string,
     },
     {
@@ -887,7 +887,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_MESH_NET_SEND,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = net_send,
     },
     {
@@ -902,7 +902,7 @@ static const struct btp_handler handlers[] = {
     },
     {
         .opcode = BTP_MESH_MODEL_SEND,
-        .expect_len = -1,
+        .expect_len = BTP_HANDLER_LENGTH_VARIABLE,
         .func = model_send,
     },
     {