Something similar, but using the HTTP POST using the Arduino EthernetClient 
if you're unable to modify the InfluxDB host config.

To use the code below: 1) Change the MAC address, 2) change the IP address 
to your InfluxDB IP address, 3) change the line in the POST construction to 
your InfluxDB and Port "client.println("Host:  192.168.1.136:8086");"

It starts breaking down when the loop delay is around 300ms. The POST is 
coming from a microcontroller and going to a Raspberry Pi 3.

#include <SPI.h>
#include <Ethernet.h>


// Enter a MAC address for your controller below.
// Newer Ethernet shields have a MAC address printed on a sticker on the 
shield
byte mac[] = { 0x00, 0x1A, 0xB6, 0x02, 0xF1, 0x16 };
IPAddress server(192, 168, 1, 136); // BBB

// Initialize the Ethernet client library
// with the IP address and port of the server 
// that you want to connect to (port 80 is default for HTTP):
EthernetClient client;


//data for HTTP Post;
String POSTData = "";

//data for HTTP response
char Response[255];

void setup()
{

//start Serial
Serial.begin(115200);

//initialize ethernet
if (Ethernet.begin(mac) == 0)
Serial.println("Failed to configure Ethernet");

// give the Ethernet peripheral a second to initialize:
delay(1000);

// let the monitor know it's starting
Serial.println("Starting");

  
}

void loop()
{

// connect to the influxdb port
if (!client.connect(server, 8086)) 
Serial.println("Did not connect");

// set some test data
String POSTData = "uCont value=" + String(millis());


// Make a HTTP request:
client.println("POST /write?db=mydb HTTP/1.1");
client.println("Host:  192.168.1.136:8086");
client.println("User-Agent: Arduino/1.6");
client.println("Connection: close");
client.println("Content-Type: application/x-www-form-urlencoded;");
client.print("Content-Length: ");
client.println(POSTData.length());
client.println();
client.println(POSTData);

delay(30);

if (client.available())
{
client.readBytes(Response, client.available());
Serial.println(Response);
}


delay(1000);

// let the monitor know something is going on in case nothing is returned.
Serial.println("loop...");

}


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