Thanks boterham and francis.

server.py

@@ -1,12 +1,13 @@
 #!/usr/bin/env python3
 # -*- coding: utf-8 -*-
+import datetime
+import time
 import string
 from http.server import HTTPServer, BaseHTTPRequestHandler
 from io import BytesIO
 import string
 import base64
 
-
 NULL_CHAR = chr(0)
 file = open('/dev/hidg0', 'rb+')
 
@@ -32,6 +33,40 @@ colors = {
     "w": "p"  # Light/blink White
 }
 
+special_chars = {
+    ' ': [NULL_CHAR, chr(44)],
+    '\n': [NULL_CHAR, chr(40)],
+    '\\': [NULL_CHAR, chr(0x31)],
+    '.': [NULL_CHAR, chr(0x37)],
+    '/': [NULL_CHAR, chr(0x38)],
+    ';': [NULL_CHAR, chr(0x33)],
+    '-': [NULL_CHAR, chr(0x2d)],
+    '=': [NULL_CHAR, chr(0x2e)],
+    '[': [NULL_CHAR, chr(0x2f)],
+    ']': [NULL_CHAR, chr(0x30)],
+    '*': [NULL_CHAR, chr(0x55)],
+    ',': [NULL_CHAR, chr(0x36)],
+    '!': [chr(32), chr(0x1e)],
+    '<': [chr(32), chr(0x36)],
+    '>': [chr(32), chr(0x37)],
+    '?': [chr(32), chr(0x38)],
+    ':': [chr(32), chr(0x33)],
+    '(': [chr(32), chr(0x26)],
+    ')': [chr(32), chr(0x27)],
+    '&': [chr(32), chr(0x24)],
+    '%': [chr(32), chr(0x22)],
+    '#': [chr(32), chr(0x20)],
+    '@': [chr(32), chr(0x1f)],
+    '$': [chr(32), chr(0x21)],
+    '_': [chr(32), chr(0x2d)],
+    '+': [chr(32), chr(0x2e)],
+    '{': [chr(32), chr(0x2f)],
+    '}': [chr(32), chr(0x30)],
+    '|': [chr(32), chr(0x31)],
+    '~': [chr(32), chr(0x35)],
+}
+
+
 def write_report(report):
     file.write(report.encode())
 
@@ -47,10 +82,8 @@ def printchar(c):
         write_report(chr(32) + NULL_CHAR + chr(4 + ord(c) - ord('A')) + NULL_CHAR * 5)
     elif c.isdigit():
         write_report(NULL_CHAR * 2 + chr(0x1e + ((ord(c) - ord('0') - 1) % 10)) + NULL_CHAR * 5)
-    elif c == ' ':
+    elif c in special_chars:
-        write_report(NULL_CHAR*2+chr(44)+NULL_CHAR*5)
+        write_report(special_chars[c][0] + NULL_CHAR + special_chars[c][1] + NULL_CHAR * 5)
-    elif c == '\n':
-        write_report(NULL_CHAR*2+chr(40)+NULL_CHAR*5)
     else:
         write_report(chr(32) + NULL_CHAR + chr(0x38) + NULL_CHAR * 5)
     release_keys()
@@ -85,6 +118,11 @@ def reset_color():
     change_color('Z', 'g')
     release_keys()
 
+def beep():
+    write_report(NULL_CHAR * 2 + chr(0x29) + 'ff' + NULL_CHAR * 3)
+    release_keys()
+    print('beep')
+
 
 class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
 
@@ -106,6 +144,7 @@ class SimpleHTTPRequestHandler(BaseHTTPRequestHandler):
             printstring('\n' * 32)
         else:
             printstring(message + '\n')
+            # beep()
         reset_color()
         file.flush()