Support slow OBD adapters

Ircama · alistair23 · commit d5a0fcd87b2d · 2021-03-15T09:37:09.000-04:00
Increase "0100" query (PIDS_A) timeout to support inexpensive/slow OBDII adapters. This patch fixes the case in which "SEARCHING" is not shown after "0100", due to slow response of cheap devices. ``` [obd.elm327] write: '0100\r' [obd.elm327] read: b'SEARCHING...\r... ``` It should also fix the case in which the debug mode needs to be active: in fact the debug logs might slow down the query timeout enough to be able to catch the query answer. Reference brendan-w#205 Reference brendan-w#200 Reference brendan-w#187
diff --git a/obd/elm327.py b/obd/elm327.py
@@ -244,7 +244,7 @@ def auto_protocol(self):
         r = self.__send(b"ATSP0")
 
         # -------------- 0100 (first command, SEARCH protocols) --------------
-        r0100 = self.__send(b"0100")
+        r0100 = self.__send(b"0100", delay=1)
         if self.__has_message(r0100, "UNABLE TO CONNECT"):
             logger.error("Failed to query protocol 0100: unable to connect")
             return False
