open file only once

server.py

@@ -7,6 +7,7 @@ import base64
 
 
 NULL_CHAR = chr(0)
+file = open('/dev/hidg0', 'rb+')
 
 colors = {
     "Z": "a",  # Black
@@ -28,8 +29,7 @@ colors = {
 }
 
 def write_report(report):
-    with open('/dev/hidg0', 'rb+') as fd:
-        fd.write(report.encode())
+    file.write(report.encode())
 
 
 def release_keys():
@@ -52,7 +52,7 @@ def printchar(c):
     release_keys()
 
 
-def change_color(background: str, foreground: str):
+def change_color(background, foreground):
     if background in colors and foreground in colors:
         # DELETE keypress
         write_report(NULL_CHAR*2+chr(0x2a)+NULL_CHAR*5)
@@ -103,6 +103,7 @@ class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
         else:
             printstring(message + '\n')
         reset_color()
+        file.flush()
 
 
 httpd = HTTPServer(('0.0.0.0', 8000), SimpleHTTPRequestHandler)