esphome:
  name: host-write-after-close

host:

api:
  actions:
    - action: write_after_close
      variables:
        port: int
      then:
        - lambda: |-
            // A second connection to the test server carries the go signal.
            auto sync = socket::socket(AF_INET, SOCK_STREAM, 0);
            struct sockaddr_storage addr;
            socklen_t len = socket::set_sockaddr(reinterpret_cast<struct sockaddr *>(&addr), sizeof(addr), "127.0.0.1", port);
            struct timeval timeout = {10, 0};
            sync->setsockopt(SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout));
            uint8_t go;
            // The loop stays blocked, so the link cannot read the close before the writes.
            if (sync->connect(reinterpret_cast<struct sockaddr *>(&addr), len) != 0 || sync->read(&go, 1) != 1) {
              ESP_LOGE("test", "No go signal");
              return;
            }
            // The first write draws a reset from the closed peer, a later one fails with EPIPE.
            uint32_t start = millis();
            while (id(tcp_uart_1).is_connected() && millis() - start < 5000) {
              id(tcp_uart_1).write_byte('b');
              id(tcp_uart_1).flush();
              delay(1);
            }

logger:
  level: INFO

tcp_uart:
  - id: tcp_uart_1
    host: 127.0.0.1
    port: 18126
    reconnect_interval: 60s