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Yes, you can send Bluetooth commands to FMC640 if you need more information, please create a VIP helpdesk ticket.
Please check this link: How to debug FMB device over Android smartphone? - Wiki Knowledge Base | Teltonika GPS (teltonika-gps.com)
You need to contact your sales manager for the documentation and protocol for the Bluetooth commands.
If you don't have any contacts with our Sale managers, please contact with them on our official website https://teltonika-gps.com/ and click on the "Contact Us" button. When you will click, please fill the form and submit it. Note: as a topic, please choose "Vehicle telematics". Or you can send an e-mail with description of your situation to email@example.com When contacting Us, please provide: IMEI/Logs/Configuration file/Intenational GSM number/Firmware version/ect, please follow these recommendations: https://wiki.teltonika-gps.com/view/Recommendations_for_filling_a_query_description