Fixed what I believe is a typo in SSID handling during packet creation.

library.properties

@@ -1,5 +1,5 @@
 name=HamShield_KISS
-version=1.0.3
+version=1.0.4
 author=Morgan Redfield <morgan@enhancedradio.com>, Casey Halverson <casey@enhancedradio.com>
 maintainer=Morgan Redfield <morgan@enhancedradio.com>
 sentence=A library for use with HamShield by Enhanced Radio Devices. 

src/KISS.cpp

@@ -23,7 +23,7 @@ void KISS::loop() {
      }
    }
    // Check if we have incoming data to turn into a packet
-   while(io->available()) {
+   while(currentlySending == false && io->available()) {
      uint8_t c = (uint8_t)io->read();
      if(c == KISS_FEND) {
        if(inFrame && kissLen > 0) {

src/packet.cpp

@@ -537,7 +537,7 @@ size_t AFSK::Packet::appendCallsign(const char *callsign, uint8_t ssid, bool fin
   if(final) {
     ssidField |= 0b01100001;
   } else {
-    ssidField |= 0b11100000;
+    ssidField |= 0b01100000;
   }
   appendFCS(ssidField);
 }