Added HELP command

src/modules/cmd/cmd.cpp

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "cmd.h"
+#include "help.h"
 
 #include <string.h>
 #include "data/track_store.h"
@@ -132,6 +133,10 @@ Cmd::CommandId Cmd::parseCommandName(const char *input) {
     return ThermoSetHigh;
   }
   
+  if (strcmp(input, "HELP") == 0) {
+    return HelpGlobal;
+  }
+
   return Unknown;
 }
 
@@ -507,6 +512,46 @@ int Cmd::handleThermoSetHigh(unsigned short argc, char* argv[]) {
   return result;
 }
 
+int Cmd::handleHelpGlobal(unsigned short argc) {
+  if (argc != 1) {
+#ifdef ERROR
+    if (logger_ != nullptr) {
+      logger_->error("HELP expects no arguments");
+    }
+#endif
+    return 1;
+  }
+#ifdef INFO
+  if (logger_ != nullptr) {
+    String line;
+    line.reserve(96);
+
+    for (size_t idx = 0; cmd_help::kGlobalHelpText[idx] != '\0'; idx++) {
+      char c = cmd_help::kGlobalHelpText[idx];
+
+      if (c == '\r') {
+        continue;
+      }
+
+      if (c == '\n') {
+        if (line.length() > 0) {
+          logger_->info(line);
+          line = "";
+        }
+        continue;
+      }
+
+      line += c;
+    }
+
+    if (line.length() > 0) {
+      logger_->info(line);
+    }
+  }
+#endif
+  return 0;
+}
+
 int Cmd::handleUnknownCommand(unsigned short argc, char *argv[]) {
 #ifdef ERROR
   if (logger_ != nullptr) {
@@ -564,6 +609,9 @@ int Cmd::dispatchCommand(CommandId command, unsigned short argc, char *argv[]) {
     case ThermoSetHigh:
       return this->handleThermoSetHigh(argc, argv);
 
+    case HelpGlobal:
+      return this->handleHelpGlobal(argc);
+
     case Unknown:
     default:
       return this->handleUnknownCommand(argc, argv);

src/modules/cmd/cmd.h

@@ -30,6 +30,7 @@ private:
     BatterySetLow,
     ThermoSetLow,
     ThermoSetHigh,
+    HelpGlobal,
   };
 
   HardwareSerial *data_stream_;
@@ -62,6 +63,7 @@ private:
   int handleBatterySetLow(unsigned short argc, char *argv[]);
   int handleThermoSetLow(unsigned short argc, char *argv[]);
   int handleThermoSetHigh(unsigned short argc, char *argv[]);
+  int handleHelpGlobal(unsigned short argc);
   int handleUnknownCommand(unsigned short argc, char *argv[]);
 
 public:

src/modules/cmd/help.h

@@ -0,0 +1,24 @@
+// Copyright (C) 2026 Hector van der Aa <hector@h3cx.dev>
+// Copyright (C) 2026 Association Exergie <association.exergie@gmail.com>
+// SPDX-License-Identifier: GPL-3.0-or-later
+#pragma once
+
+namespace cmd_help {
+static constexpr char kGlobalHelpText[] =
+    "Available commands:\n"
+    "  HELP\n"
+    "  REBOOT\n"
+    "  CFG_DUMP\n"
+    "  CFG_RESET\n"
+    "  TRACK_PUT,<slot>,<name>,<point_a_lat>,<point_a_lng>,<point_b_lat>,<point_b_lng>\n"
+    "  TRACK_DELETE,<slot>\n"
+    "  TRACK_DUMP,<slot>\n"
+    "  TRACK_AUTODETECT\n"
+    "  DISPLAY_GPS_DEBUG\n"
+    "  DISPLAY_DRIVER_PRIMARY\n"
+    "  BATTERY_CAL,<actual_voltage>\n"
+    "  BATTERY_PRINT_VBAT\n"
+    "  BATTERY_SET_LOW,<voltage>\n"
+    "  THERMO_SET_LOW,<temperature>\n"
+    "  THERMO_SET_HIGH,<temperature>\n";
+} // namespace cmd_help