I am in search for some examples as to how can one use the AsyncUDPMessage in an Application for sending out UDP packets to a host with specific IP address and Port number from an ESP-WROOM-32 (Olimex ESP32-PoE) module?

The Class for AsyncUDPMessage in arduino-esp32 library inherits from Print.

I want to send sensor measurements to InfluxDB in the Line Protocol (InfluxDB specific).

Example

 imu,location=front,nodeid=node1 status=0.00,liac_x=-1.18,liac_y=0.02,liac_z=9.63,eul_x=0.00,eul_y=-6.81,eul_z=0.25 1538507409930

The above mentioned example is stored in the form of a String and the methods to send information via UDP viz. send() sendTo() all mention usage of AsyncUDPMessage as the first parameter.

###goal Send the above measurement to the particular Device's IP and port

udp.sendTo(Message, IPAddress(192,168,3,11), 8089);

I am currently using broadcastTo(const char * data, port) menthod to send information the InfluxDB instance.

Code

void loop(void) {

  DateTime now_time = rtc.now();

 // create a measurement
  influxMeasurement row("imu");
  row.addTag("location", "front");
  row.addTag("nodeid", "node1");

// get information from BNO055
  imu::Vector<3> li_ac = bno.getVector(Adafruit_BNO055::VECTOR_ACCELEROMETER);
  imu::Vector<3> euler = bno.getVector(Adafruit_BNO055::VECTOR_EULER);
//  Serial.print(li_ac.x());
//  Serial.print(li_ac.y());
  row.addField("status", 0);
  row.addField("liac_x", li_ac.x());
  row.addField("liac_y", li_ac.y());
  row.addField("liac_z", li_ac.z());
  row.addField("eul_x", euler.x());
  row.addField("eul_y", euler.y());
  row.addField("eul_z", euler.z());

  // add timestamp
  row.addTimeStamp_ms(String(now_time.unixtime()) + String(millis()%1000));

  // print the Line Protocol output
  Serial.println(row.postString());

  // UDP Sending 
  char buf[2048]; // make buffer for `broadcastTo()`
  row.postString().toCharArray(buf, sizeof(buf)); // string to char array
  // Serial.println(buf);
  udp.broadcastTo(buf ,8089);
  
  delay(100);
}

method

I create a Line protocol String, make a buffer, convert the string to char [] and send it out.

Question

1. how do I use AsyncUDPMessage so I can pass the string to it directly?

2. I am not sure but will char buf[2048] within a loop is a good idea as every time a buffer allocation might make the ESP32 run out of memory? And if AsyncUDPMessage can avoid this concern?