diff --git a/benchmark3.py b/benchmark3.py
index 347ee5f..91db647 100644
--- a/benchmark3.py
+++ b/benchmark3.py
@@ -9,6 +9,8 @@ from blist import blist
 from dataclasses import dataclass
 import threading
 import queue
+import sys
+import csv
 
 
 @dataclass(frozen=False, init=True)
@@ -125,6 +127,20 @@ def run_benchmark(num_workers: int, timeout: float, filename: str):
     return all_requests_completed
 
 
+def write_results(results, file_handle):
+    writer = csv.writer(file_handle)
+    # fire_time = Upload complete
+    # latency is in ms
+    writer.writerow(['id', 'fire_time', 'response_arrive_time', 'latency'])
+
+    for result in results.values():
+        latency = int((result.alert_arrived - result.upload_started) * 1000)
+        fire_time = datetime.fromtimestamp(result.upload_finished).isoformat()
+        response_arrive_time = datetime.fromtimestamp(result.alert_arrived).isoformat()
+        row = [result.id, fire_time, response_arrive_time, latency]
+        writer.writerow(row)
+
+
 def main():
     parser = argparse.ArgumentParser(
         description='Birbnetes Benchmarker 3'
@@ -141,6 +157,8 @@ def main():
     parser.add_argument('--inflight-timeout', type=int, required=False, default=30,
                         help='Number of seconds to wait for MQTT messages to arrive after uploading finished (not very precise) (0 for not waiting)')
 
+    parser.add_argument('--output', type=str, required=True, help='name of the file to write results to (- for stdout)')
+
     parser.add_argument('--mqtt-username', type=str, required=False, default="birbnetes",
                         help="Username for the MQTT server")
     parser.add_argument('--mqtt-port', type=int, required=False, default=1883, help="Port for the MQTT server")
@@ -183,7 +201,7 @@ def main():
     total_successful_uploads = len([req for req in benchmark_results.values() if req.upload_status_code == 200])
     all_arrived = False
     waiting_started = time.time()
-    for _ in range(int(args.inflight_timeout*1000)):
+    for _ in range(int(args.inflight_timeout * 1000)):
         if alerts_arrived_queue.qsize() >= total_successful_uploads:
             all_arrived = True
             break
@@ -225,6 +243,15 @@ def main():
     print(f"Test total runtime was {total_runtime} seconds")
     print("HTTP Request/sec:", len(benchmark_results) / total_runtime)
 
+    if args.output == '-':
+        print("Writing results to STDOUT")
+        print("\n---------- CUT HERE ----------\n")
+        write_results(benchmark_results, sys.stdout)
+    else:
+        print("Writing results to", args.output)
+        with open(args.output, 'w') as f:
+            write_results(benchmark_results, f)
+
 
 if __name__ == '__main__':
     main()