{"id":5097,"date":"2026-03-31T14:46:00","date_gmt":"2026-03-31T05:46:00","guid":{"rendered":"https:\/\/www.freelifemakers.org\/wordpress\/?p=5097"},"modified":"2026-03-31T15:07:28","modified_gmt":"2026-03-31T06:07:28","slug":"arduinoesp32-socket-comm-macos","status":"publish","type":"post","link":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/2026\/03\/31\/arduinoesp32-socket-comm-macos\/","title":{"rendered":"[Arduino]ESP32 Socket \ud1b5\uc2e0 \/ ESP32 Socket Communication(MacOS)"},"content":{"rendered":"\n

\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 Esp32 \uc640 nodejs\uc18c\ucf13 \ud1b5\uc2e0\uc5d0 \ub300\ud55c \uc608\uc81c\uc785\ub2c8\ub2e4.
Below is an example of Esp32 and Node.js socket communication.<\/p>\n\n\n\n

\ud83d\udc49\ud83c\udffb Esp32\uc124\uc815\uc740 \uae30\uc874\uacfc \ub3d9\uc77c\ud569\ub2c8\ub2e4.
The Esp32 settings are the same as before.<\/p>\n\n\n\n

\ud83d\udc49\ud83c\udffb Esp32\uc5d0\uc11c “sensor=42” \uba54\uc138\uc9c0\ub97c \uc11c\ubc84\ub85c \ubcf4\ub0b4\uace0 \uc11c\ubc84\ub294 “ACK:<Esp32\uc5d0\uc11c \ubcf4\ub0b8 \uba54\uc138\uc9c0>”\ud615\uc2dd\uc744Esp32\ub85c \ubcf4\ub0c5\ub2c8\ub2e4.
Esp32 sends the “sensor=42” message to the server, and the server sends a message in the format “ACK:” to Esp32.<\/p>\n\n\n\n

\ud83d\udc49\ud83c\udffb Esp32<\/p>\n\n\n\n

#include <WiFi.h>\n\nconst char* ssid = \"YOUR_ID\";\nconst char* password = \"YOUR_PASSWORD\";\n\n\/\/ \uc544\uc774\ud53c \uc8fc\uc18c \/  Ipaddress\nconst char* host = \"192.168.0.100\";\nconst uint16_t port = 3000;\n\nWiFiClient client;\n\nvoid connectToServer() {\n  Serial.print(\"Connecting to server...\");\n  if (client.connect(host, port)) {\n    Serial.println(\"connected\");\n  } else {\n    Serial.println(\"failed\");\n  }\n}\n\nvoid setup() {\n  Serial.begin(115200);\n  WiFi.begin(ssid, password);\n  while (WiFi.status() != WL_CONNECTED) { delay(500); }\n\n  Serial.print(\"WiFi OK. IP: \");\n  Serial.println(WiFi.localIP());\n\n  connectToServer();\n}\n\nvoid loop() {\n  \/\/ \ub04a\uacbc\uc73c\uba74 \uc7ac\uc5f0\uacb0 \/ If disconnected, reconnect\n  if (!client.connected()) {\n    client.stop();\n    connectToServer();\n    delay(1000);\n    return;\n  }\n\n  \/\/ ESP32 \u2192 \uc11c\ubc84\ub85c \uba54\uc2dc\uc9c0 \ubcf4\ub0b4\uae30\n  \/\/ ESP32 \u2192 Send message to server\n  client.println(\"sensor=42\");\n\n  \/\/ \uc11c\ubc84 \u2192 ESP32 \uc751\ub2f5 \uc77d\uae30\n  \/\/ Read server \u2192 ESP32 response\n  while (client.available()) {\n    String line = client.readStringUntil('\\n');\n    Serial.print(\"Server: \");\n    Serial.println(line);\n  }\n\n  delay(2000);\n}\n<\/code><\/pre>\n\n\n\n
\"\"
Screenshot<\/figcaption><\/figure>\n\n\n\n
\ud83d\udc49\ud83c\udffb server.js<\/p>\n\n\n\n
const net = require(\"net\");\n\nconst server = net.createServer((socket) => {\n  console.log(\"Client connected:\", socket.remoteAddress, socket.remotePort);\n\n  socket.on(\"data\", (data) => {\n    const msg = data.toString().trim();\n    console.log(\"RX:\", msg);\n\n    \/\/ \ubc1b\uc740 \uba54\uc2dc\uc9c0\uc5d0 \ub300\ud55c \uc751\ub2f5 \/ Response to a received message\n    socket.write(\"ACK:\" + msg + \"\\n\");\n  });\n\n  socket.on(\"end\", () => {\n    console.log(\"Client disconnected\");\n  });\n\n  socket.on(\"error\", (err) => {\n    console.error(\"Socket error:\", err);\n  });\n});\n\nserver.listen(3000, \"192.168.0.10\", () => {\n  console.log(\"TCP server listening on 192.168.0.100:3000\");\n});\n<\/code><\/pre>\n\n\n\n
\"\"
Screenshot<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"
\ud83d\udc49\ud83c\udffb \uc544\ub798\ub294 Esp32 \uc640 nodejs\uc18c\ucf13 \ud1b5\uc2e0\uc5d0 \ub300\ud55c \uc608\uc81c\uc785\ub2c8\ub2e4.Below is an example of Esp32 and Node.js socket communication. \ud83d\udc49\ud83c\udffb Esp32\uc124\uc815\uc740 \uae30\uc874\uacfc \ub3d9\uc77c\ud569\ub2c8\ub2e4.The Esp32 settings are the same as before. \ud83d\udc49\ud83c\udffb Esp32\uc5d0\uc11c “sensor=42” \uba54\uc138\uc9c0\ub97c \uc11c\ubc84\ub85c \ubcf4\ub0b4\uace0 \uc11c\ubc84\ub294 “ACK:<Esp32\uc5d0\uc11c \ubcf4\ub0b8 \uba54\uc138\uc9c0>”\ud615\uc2dd\uc744Esp32\ub85c \ubcf4\ub0c5\ub2c8\ub2e4.Esp32 sends the “sensor=42” message to the server, and the server sends a message in the format […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,1],"tags":[],"class_list":["post-5097","post","type-post","status-publish","format-standard","hentry","category-arduino","category-uncategorized","missing-thumbnail"],"_links":{"self":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5097","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/comments?post=5097"}],"version-history":[{"count":3,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5097\/revisions"}],"predecessor-version":[{"id":5103,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/posts\/5097\/revisions\/5103"}],"wp:attachment":[{"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/media?parent=5097"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/categories?post=5097"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.freelifemakers.org\/wordpress\/index.php\/wp-json\/wp\/v2\/tags?post=5097"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}