From 559a1bfe97d8a7c1ddbd97cd39bfe275f58e9e44 Mon Sep 17 00:00:00 2001
From: Ian Newton <i.newton@c-org.com>
Date: Fri, 7 Mar 2025 17:04:20 +0000
Subject: [PATCH] Make usb sensor timeout more robust

---
 validitysensor/usb.py | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/validitysensor/usb.py b/validitysensor/usb.py
index ae67576..7382509 100644
--- a/validitysensor/usb.py
+++ b/validitysensor/usb.py
@@ -122,10 +122,13 @@ def cancel(self):
 
     def wait_int(self):
         self.cancel = False
+        max_retries = 3  # Number of retry attempts before giving up
+        retry_count = 0
+        timeout_ms = 500  # Increased timeout from 100ms to 500ms
 
         while True:
             try:
-                resp = self.dev.read(131, 1024, timeout=100)
+                resp = self.dev.read(131, 1024, timeout=timeout_ms)
                 resp = bytes(resp)
                 self.trace('<int< %s' % hexlify(resp).decode())
                 return resp
@@ -133,6 +136,15 @@ def wait_int(self):
                 if e.errno == errno.ETIMEDOUT:
                     if self.cancel:
                         raise CancelledException()
+                    
+                    # Add retry logic for transient timeouts
+                    retry_count += 1
+                    if retry_count <= max_retries:
+                        self.trace(f'USB timeout, retrying ({retry_count}/{max_retries})...')
+                        continue
+                    else:
+                        self.trace(f'USB timeout after {max_retries} retries, giving up')
+                        raise
                 else:
                     raise e