Simple UDP calls, if wired up a fair bit of this can go again.

this is preliminary work

src/DebugConfiguration.cpp

@@ -0,0 +1,241 @@
+/* based on https://github.com/arcao/Syslog
+
+MIT License
+
+Copyright (c) 2016 Martin Sloup
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.*/
+
+#include "DebugConfiguration.h"
+
+Syslog::Syslog(UDP &client) {
+  this->_client = &client;
+  this->_server = NULL;
+  this->_port = 0;
+  this->_deviceHostname = SYSLOG_NILVALUE;
+  this->_appName = SYSLOG_NILVALUE;
+  this->_priDefault = LOGLEVEL_KERN;
+}
+
+Syslog &Syslog::server(const char* server, uint16_t port) {
+  this->_server = server;
+  this->_port = port;
+  return *this;
+}
+
+Syslog &Syslog::server(IPAddress ip, uint16_t port) {
+  this->_ip = ip;
+  this->_server = NULL;
+  this->_port = port;
+  return *this;
+}
+
+Syslog &Syslog::deviceHostname(const char* deviceHostname) {
+  this->_deviceHostname = (deviceHostname == NULL) ? SYSLOG_NILVALUE : deviceHostname;
+  return *this;
+}
+
+Syslog &Syslog::appName(const char* appName) {
+  this->_appName = (appName == NULL) ? SYSLOG_NILVALUE : appName;
+  return *this;
+}
+
+Syslog &Syslog::defaultPriority(uint16_t pri) {
+  this->_priDefault = pri;
+  return *this;
+}
+
+Syslog &Syslog::logMask(uint8_t priMask) {
+  this->_priMask = priMask;
+  return *this;
+}
+
+void Syslog::enable() {
+  this->_enabled = true;
+}
+
+void Syslog::disable() {
+  this->_enabled = false;
+}
+
+bool Syslog::isEnabled()
+{
+  return this->_enabled;
+}
+
+bool Syslog::log(uint16_t pri, const __FlashStringHelper *message) {
+  return this->_sendLog(pri, message);
+}
+
+bool Syslog::log(uint16_t pri, const String &message) {
+  return this->_sendLog(pri, message.c_str());
+}
+
+bool Syslog::log(uint16_t pri, const char *message) {
+  return this->_sendLog(pri, message);
+}
+
+bool Syslog::vlogf(uint16_t pri, const char *fmt, va_list args) {
+  char *message;
+  size_t initialLen;
+  size_t len;
+  bool result;
+
+  initialLen = strlen(fmt);
+
+  message = new char[initialLen + 1];
+
+  len = vsnprintf(message, initialLen + 1, fmt, args);
+  if (len > initialLen) {
+    delete[] message;
+    message = new char[len + 1];
+
+    vsnprintf(message, len + 1, fmt, args);
+  }
+
+  result = this->_sendLog(pri, message);
+
+  delete[] message;
+  return result;
+}
+
+bool Syslog::vlogf_P(uint16_t pri, PGM_P fmt_P, va_list args) {
+  char *message;
+  size_t initialLen;
+  size_t len;
+  bool result;
+
+  initialLen = strlen_P(fmt_P);
+
+  message = new char[initialLen + 1];
+
+  len = vsnprintf_P(message, initialLen + 1, fmt_P, args);
+  if (len > initialLen) {
+    delete[] message;
+    message = new char[len + 1];
+
+    vsnprintf(message, len + 1, fmt_P, args);
+  }
+
+  result = this->_sendLog(pri, message);
+
+  delete[] message;
+  return result;
+}
+
+
+bool Syslog::logf(uint16_t pri, const char *fmt, ...) {
+  va_list args;
+  bool result;
+
+  va_start(args, fmt);
+  result = this->vlogf(pri, fmt, args);
+  va_end(args);
+  return result;
+}
+
+bool Syslog::logf_P(uint16_t pri, PGM_P fmt_P, ...) {
+  va_list args;
+  bool result;
+
+  va_start(args, fmt_P);
+  result = this->vlogf_P(pri, fmt_P, args);
+  va_end(args);
+  return result;
+}
+
+inline bool Syslog::_sendLog(uint16_t pri, const char *message) {
+  int result;
+
+  if (!this->_enabled)
+    return false;
+
+  if ((this->_server == NULL && this->_ip == INADDR_NONE) || this->_port == 0)
+    return false;
+
+  // Check priority against priMask values.
+  if ((LOG_MASK(LOG_PRI(pri)) & this->_priMask) == 0)
+    return true;
+
+  // Set default facility if none specified.
+  if ((pri & LOG_FACMASK) == 0)
+    pri = LOG_MAKEPRI(LOG_FAC(this->_priDefault), pri);
+
+  if (this->_server != NULL) {
+    result = this->_client->beginPacket(this->_server, this->_port);
+  } else {
+    result = this->_client->beginPacket(this->_ip, this->_port);
+  }
+
+  if (result != 1)
+    return false;
+
+  this->_client->print('<');
+  this->_client->print(pri);
+  this->_client->print(F(">1 - "));
+  this->_client->print(this->_deviceHostname);
+  this->_client->print(' ');
+  this->_client->print(this->_appName);
+  this->_client->print(F(" - - - \xEF\xBB\xBF"));
+  this->_client->print(F("[0]: "));
+  this->_client->print(message);
+  this->_client->endPacket();
+
+  return true;
+}
+
+inline bool Syslog::_sendLog(uint16_t pri, const __FlashStringHelper *message) {
+  int result;
+
+  if (!this->_enabled)
+    return false;
+
+  if ((this->_server == NULL && this->_ip == INADDR_NONE) || this->_port == 0)
+    return false;
+
+  // Check priority against priMask values.
+  if ((LOG_MASK(LOG_PRI(pri)) & this->_priMask) == 0)
+    return true;
+
+  // Set default facility if none specified.
+  if ((pri & LOG_FACMASK) == 0)
+    pri = LOG_MAKEPRI(LOG_FAC(this->_priDefault), pri);
+
+  if (this->_server != NULL) {
+    result = this->_client->beginPacket(this->_server, this->_port);
+  } else {
+    result = this->_client->beginPacket(this->_ip, this->_port);
+  }
+
+  if (result != 1)
+    return false;
+
+  this->_client->print('<');
+  this->_client->print(pri);
+  this->_client->print(F(">1 - "));
+  this->_client->print(this->_deviceHostname);
+  this->_client->print(' ');
+  this->_client->print(this->_appName);
+  this->_client->print(F(" - - - \xEF\xBB\xBF"));
+  this->_client->print(message);
+  this->_client->endPacket();
+
+
+  return true;
+}