Allow unicast TX to overlap with MC (ARMmbed#2298)

Allow unicast TX overlap with the next MC slot to improve data rate.

Co-authored-by: Jarkko Paso <jarkko.paso@arm.com>

source/Service_Libs/fhss/fhss_ws.c

@@ -606,6 +606,10 @@ static bool fhss_ws_check_tx_allowed(fhss_structure_t *fhss_structure)
 
 static bool fhss_ws_check_tx_time(fhss_structure_t *fhss_structure, uint16_t tx_length, uint8_t phy_header_length, uint8_t phy_tail_length)
 {
+    /*
+     * Check if there is enough time for transmitting before the next multicast slot.
+     */
+#ifdef FHSS_WS_PROTECT_MC_SLOTS
     if (!fhss_structure->ws->fhss_configuration.fhss_broadcast_interval || !fhss_structure->ws->fhss_configuration.fhss_bc_dwell_interval) {
         return true;
     }
@@ -615,6 +619,13 @@ static bool fhss_ws_check_tx_time(fhss_structure_t *fhss_structure, uint16_t tx_
         return false;
     }
     return true;
+#else
+    (void) fhss_structure;
+    (void) tx_length;
+    (void) phy_header_length;
+    (void) phy_tail_length;
+    return true;
+#endif
 }
 
 static bool fhss_ws_check_tx_conditions_callback(const fhss_api_t *api, bool is_broadcast_addr, uint8_t handle, int frame_type, uint16_t frame_length, uint8_t phy_header_length, uint8_t phy_tail_length)