Add configuration flag to allow text aprs messaging

ax25_payload.cpp

@@ -14,6 +14,31 @@ Payload::Payload(const String &textPayload)
   isValid_ = fromString(textPayload);
 }
 
+Payload::Payload(const Payload &payload)
+  : isValid_(payload.isValid_)
+  , srcCall_(payload.srcCall_)
+  , dstCall_(payload.dstCall_)
+  , rptCallsCount_(payload.rptCallsCount_)
+  , info_(payload.info_)
+{
+    for (int i = 0; i < rptCallsCount_; i++) {
+      rptCalls_[i] = payload.rptCalls_[i];
+    }
+}
+
+Payload& Payload::operator=(const Payload &payload)
+{
+  isValid_ = payload.isValid_;
+  srcCall_ = payload.srcCall_;
+  dstCall_ = payload.dstCall_;
+  rptCallsCount_ = payload.rptCallsCount_;
+  info_ = payload.info_;
+  for (int i = 0; i < rptCallsCount_; i++) {
+    rptCalls_[i] = payload.rptCalls_[i];
+  }
+  return *this;
+}
+
 void Payload::Dump() 
 {
   LOG_INFO("valid: ", isValid_);
@@ -65,7 +90,7 @@ int Payload::ToBinary(byte *txPayload, int bufferLength) const
   return (int)(txPtr-txPayload);
 }
 
-String Payload::ToString(const String &customComment)
+String Payload::ToString(const String &customComment) const
 {
   String txt = srcCall_.ToString() + String(">") + dstCall_.ToString();
 

ax25_payload.h

@@ -13,10 +13,12 @@ class Payload
 public:
   Payload(const String &textPayload);
   Payload(const byte *rxPayload, int payloadLength);
+  Payload(const Payload &payload);
+  Payload& operator=(const Payload &payload);
 
   inline bool IsValid() const { return isValid_; }
   
-  String ToString(const String &customComment=String());
+  String ToString(const String &customComment=String()) const;
   int ToBinary(byte *txPayload, int bufferLength) const;
 
   bool Digirepeat(const Callsign &ownCallsign);

config.h

@@ -65,6 +65,7 @@
 #define CFG_RF_TO_IS          true    // forward packets from radio to internet
 #define CFG_IS_TO_RF          false   // forward packets from internet to radio basedon CFG_APRS_FILTER
 #define CFG_BEACON            false   // enable perdiodc beacon from CFG_APRS_RAW_BKN 
+#define CFG_TEXT_PACKETS      false   // enable aprs text packets instead of binary for interoperability with other projects (disables ax.25)
 
 // frequency correction for narrow band bandwidths
 #define CFG_FREQ_CORR         false   // true - correct own frequency based on received packet

esp32_loraprs.ino

@@ -70,8 +70,12 @@ void initializeConfig(LoraPrs::Config &cfg) {
   cfg.EnableIsToRf = CFG_IS_TO_RF; // send data from aprsis to rf
   cfg.EnableRepeater = CFG_DIGIREPEAT; // digirepeat incoming packets
   cfg.EnableBeacon = CFG_BEACON;  // enable periodic AprsRawBeacon beacon to rf and aprsis if rf to aprsis is enabled
+  cfg.EnableTextPackets = CFG_TEXT_PACKETS; // enables text packets and disables AX25 binary frames for interoperability
+  
+  // kiss
   cfg.KissEnableExtensions = CFG_KISS_EXTENSIONS; // radio control and signal reports
   cfg.KissEnableTcpIp = CFG_KISS_TCP_IP;  // enable KISS ovr TCP/IP as a server
+  
 
   // external ptt control
   cfg.PttEnable = CFG_PTT_ENABLE;

loraprs_config.h

@@ -62,6 +62,7 @@ struct Config
   bool EnableIsToRf;                    // true - enable APRS-IS to RF submission
   bool EnableRepeater;                  // true - digirepeat incoming packets based on WIDEn-n paths
   bool EnableBeacon;                    // true - send AprsRawBeacon to RF and APRS-IS if EnableRfToIs is true
+  bool EnableTextPackets;               // true - use text plain messages insead of AX25 binary frames for interoperability with other projects
 
   // external ptt tx control
   bool PttEnable;                       // true - enable external ptt control

loraprs_service.cpp

@@ -411,11 +411,22 @@ void Service::sendSignalReportEvent(int rssi, float snr)
 
 bool Service::sendAX25ToLora(const AX25::Payload &payload)
 {
+  int bytesWritten;
   byte buf[CfgMaxAX25PayloadSize];
-  int bytesWritten = payload.ToBinary(buf, sizeof(buf));
-  if (bytesWritten <= 0) {
-    LOG_WARN("Failed to serialize payload");
-    return false;
+  if (config_.EnableTextPackets) {
+    String textPayload = payload.ToString();
+    bytesWritten = textPayload.length();
+    if (bytesWritten > CfgMaxAX25PayloadSize) {
+      bytesWritten = CfgMaxAX25PayloadSize;
+    }
+    textPayload.getBytes(buf, bytesWritten);
+    buf[bytesWritten-1] = '\0';
+  } else {
+    bytesWritten = payload.ToBinary(buf, sizeof(buf));
+    if (bytesWritten <= 0) {
+      LOG_WARN("Failed to serialize payload");
+      return false;
+    }
   }
   queueSerialToRig(Cmd::Data, buf, bytesWritten);
   return true;
@@ -475,8 +486,14 @@ void Service::loraReceive(int packetSize)
 
 void Service::processIncomingRawPacketAsServer(const byte *packet, int packetLength) {
 
+  // create from binary AX25
   AX25::Payload payload(packet, packetLength);
 
+  // try to parse as text for clients, who submit plain text
+  if (!payload.IsValid() && config_.EnableTextPackets && packet[packetLength - 1] == '\0') {
+    payload = AX25::Payload(String((char*)packet));
+  }
+
   if (payload.IsValid()) {
 
 #ifdef USE_RADIOLIB