But eventually I realized, that OBD data is not that really needed for my purposes of tracking vehicle's location and movement. I tested to figure out the perpetrator: an expensive OBD-reader from another manufacturer could read my ODB data, and Freematics was able to read other car's data. In my case, Freematics DIDN'T work with my Renault's OBD-II port. I've also seen many complaints that Freematics has numerous problems with electric vehicles. If you have a car manufactured before 2000s, it probably will not support the OBD specification. I will fix so that it will ping server and also transmit latest location.
#Traccar devices Offline
NOT FIXED This approach has many flaws: if you had a ride in the area with bad network coverage, your route there will have significat gaps or if you stopped your car in place A with internet, then moved to place B while being offline and then internet appeared in place B, then Freematics will send just ping events (not location data), and Traccar will show that your are still in place A. Freematics doesn't re-send any data collected while being offline, but only stores them on disk. When in standby, Freematics pings the server every PING_BACK_INTERVAL seconds (15 min by default) and if there is no connection, then it just waits for the next 15 min. Wakes up after the accelerator sensor wakes it up. Freematics goes into standby mode after 180 seconds (the third value of STATIONARY_TIME_TABLE parameter).Always choose SD card as a storage ( #define STORAGE STORAGE_SD), since internal SPIFFS memory is very small and will cyclically rewrite itself. The data gets immediately written to file storage as CSV files (but flushed incrementally with each 1 KiB, equal to approximately 6 records). Device gathers data every X milliseconds (see the DATA_INTERVAL_TABLE parameter).It has 2 types of requests, the first sends only events and alarms (without location) and the other sends only key-value data payload (location, ODB data, etc.).How does Freematics internally work? (tracking logic of firmware_v5/telelogger.ino sketch)
#Traccar devices how to
Ways to circumvent it: A) make the requests to a regular server, that redirects/proxies it to the HTTPS server or B) use packet mirroring via WiFi router (any ideas how to do it?, does this work?). I tried using WiFiClientSecure library, but it didn't compile.
You can use an external GPS receiver (costs around $10), but that is more suitable to be used with model A which has no internal GPS. Due to the antenna being in the enclosure, sometimes the location of the OBD port may prevent the antenna from getting a good GPS signal from the sky. ONE+ Model B (as well as Traccar edition) has an internal GPS receiver.It means that if a theif cuts off the device, Freematics would not be able to send the SOS signal to the server. Works only when connected to USB (3.7V), OBD-II (12V), or SAE J1939 (24V). Doesn't work at all without external power, has no battery.
#Traccar devices windows
If you want to switch to a different WiFi or mobile operator - you need to open your bloody Windows and recompile everything :) Currently, Freematics cannot switch between WiFi and SIM depending on connectivity.What are the pitfalls and hardware drawbacks of Freematics? Both are open-source, thanks to which I was able to improve both and their cooperation. In this article I listed some common problems I encountered when I tried to use Freematics OBD-reader together with traccar device-tracking server.
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