move to new skeleton

tutorials/websocket/websocket-client/Makefile

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+PROG ?= example                   # Program we are building
+DELETE = rm -rf                   # Command to remove files
+OUT ?= -o $(PROG)                 # Compiler argument for output file
+SOURCES = main.c mongoose.c       # Source code files
+CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+
+# Mongoose build options. See https://mongoose.ws/documentation/#build-options
+#CFLAGS_MONGOOSE += -DMG_ENABLE_LINES
+
+ifeq ($(OS),Windows_NT)   # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
+  PROG ?= example.exe           # Use .exe suffix for the binary
+  CC = gcc                      # Use MinGW gcc compiler
+  CFLAGS += -lws2_32            # Link against Winsock library
+  DELETE = cmd /C del /Q /F /S  # Command prompt command to delete files
+  OUT ?= -o $(PROG)             # Build output
+endif
+
+all: $(PROG)              # Default target. Build and run program
+	$(RUN) ./$(PROG) $(ARGS)
+
+$(PROG): $(SOURCES)       # Build program from sources
+	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
+
+clean:                    # Cleanup. Delete built program and all build artifacts
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM

tutorials/websocket/websocket-client/README.md

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+See detailed tutorial at https://mongoose.ws/tutorials/websocket/websocket-client/

tutorials/websocket/websocket-client/main.c

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+// Copyright (c) 2020 Cesanta Software Limited
+// All rights reserved
+//
+// Example Websocket client. Usage:
+//    1. Start websocket server: cd ../websocket-server && make
+//    2. In another terminal, start this client: make
+
+#include "mongoose.h"
+
+static const char *s_url = "ws://localhost:8000/websocket";
+
+// Print websocket response and signal that we're done
+static void fn(struct mg_connection *c, int ev, void *ev_data) {
+  if (ev == MG_EV_OPEN) {
+    c->is_hexdumping = 1;
+  } else if (ev == MG_EV_ERROR) {
+    // On error, log error message
+    MG_ERROR(("%p %s", c->fd, (char *) ev_data));
+  } else if (ev == MG_EV_WS_OPEN) {
+    // When websocket handshake is successful, send message
+    mg_ws_send(c, "hello", 5, WEBSOCKET_OP_TEXT);
+  } else if (ev == MG_EV_WS_MSG) {
+    // When we get echo response, print it
+    struct mg_ws_message *wm = (struct mg_ws_message *) ev_data;
+    printf("GOT ECHO REPLY: [%.*s]\n", (int) wm->data.len, wm->data.buf);
+  }
+
+  if (ev == MG_EV_ERROR || ev == MG_EV_CLOSE || ev == MG_EV_WS_MSG) {
+    *(bool *) c->fn_data = true;  // Signal that we're done
+  }
+}
+
+int main(void) {
+  struct mg_mgr mgr;        // Event manager
+  bool done = false;        // Event handler flips it to true
+  struct mg_connection *c;  // Client connection
+  mg_mgr_init(&mgr);        // Initialise event manager
+  mg_log_set(MG_LL_DEBUG);  // Set log level
+  c = mg_ws_connect(&mgr, s_url, fn, &done, NULL);     // Create client
+  while (c && done == false) mg_mgr_poll(&mgr, 1000);  // Wait for echo
+  mg_mgr_free(&mgr);                                   // Deallocate resources
+  return 0;
+}

tutorials/websocket/websocket-client/mongoose.c

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+../../../mongoose.c

tutorials/websocket/websocket-client/mongoose.h

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+../../../mongoose.h