Display asterisk for non digit and non letter character of callsign.

gr-mobitub3/lib/Beacon_Body_Decoder_impl.cc

@@ -153,7 +153,13 @@ void Beacon_Body_Decoder_impl::handle_enable_status(pmt::pmt_t msg)
     log.add_to_log_entry_new_line("");
     log.ss << "Received callsign: ";
     for (uint8_t i = 0; i < 6; i++) {
-        log.ss << (char)rx.callsign[i];
+        if(((((char)rx.callsign[i]) >= 0x30) && (((char)rx.callsign[i]) <= 0x3A))
+                || ((((char)rx.callsign[i]) >= 0x41) && (((char)rx.callsign[i]) <= 0x5A))
+                || ((((char)rx.callsign[i]) >= 0x60) && (((char)rx.callsign[i]) <= 0x7A))) {
+            log.ss << (char)rx.callsign[i];
+        } else {
+            log.ss << (char)0x2A;
+        }
     }
     log.write_new_log_entry(log.ss.str());
 

gr-mobitub3/lib/Beacon_Header_Decoder_impl.cc

@@ -186,7 +186,13 @@ int Beacon_Header_Decoder_impl::general_work(int noutput_items,
             if (fr.read_callsign(in[i])) {
                 std::cout << "Callsign received: ";
                 for (uint8_t i = 0; i < 6; i++) {
-                    std::cout << (char)rx.callsign[i];
+                    if(((((char)rx.callsign[i]) >= 0x30) && (((char)rx.callsign[i]) <= 0x3A))
+                            || ((((char)rx.callsign[i]) >= 0x41) && (((char)rx.callsign[i]) <= 0x5A))
+                            || ((((char)rx.callsign[i]) >= 0x60) && (((char)rx.callsign[i]) <= 0x7A))) {
+                        std::cout << (char)rx.callsign[i];
+                    } else {
+                        std::cout << (char)0x2A;
+                    }
                 }
                 std::cout << std::endl;
                 // set next state to short data block