Updated FHSS optimal packet length to 300 bytes (#2282)

* Check if TX slot setting is too high and use default instead

* Fixed warning caused by debug trace

Author: Jarkko Paso

source/Service_Libs/fhss/fhss_ws.c

@@ -199,6 +199,11 @@ static void fhss_set_txrx_slot_length(fhss_structure_t *fhss_structure)
         uint32_t datarate = fhss_structure->callbacks.read_datarate(fhss_structure->fhss_api);
         if (datarate) {
             txrx_slot_length_ms_tmp = ((OPTIMAL_PACKET_LENGTH * 2) * (8000000 / datarate)) / 1000;
+            // Do not allow using too high TX slot length.
+            if (txrx_slot_length_ms_tmp > WS_TXRX_SLOT_LEN_MS) {
+                tr_debug("TX slot length setting too high %"PRIu32"ms, using %"PRIu32"ms", txrx_slot_length_ms_tmp, (uint32_t)WS_TXRX_SLOT_LEN_MS);
+                txrx_slot_length_ms_tmp = WS_TXRX_SLOT_LEN_MS;
+            }
         }
     }
     uint32_t number_of_tx_slots = ((fhss_structure->ws->fhss_configuration.fhss_broadcast_interval - fhss_structure->ws->fhss_configuration.fhss_bc_dwell_interval) / txrx_slot_length_ms_tmp) / 2;