I can't seem to get the exact router model from that command. I have included the output that I get below.
I am specifically looking for the text "Teltonika RUT240 LTE" exactly as you would see it on the "Status" -> "System" page on the WebUI.
{"jsonrpc":"2.0","id":1,"result":[0,{"values":{"system":{".anonymous":false,".type":"system",".name":"system",".index":0,"timezone":"UTC","conloglevel":"8","log_type":"circular","log_buffer_size":"128","enable_pppd_debug":"0","enable_chat_log":"1","enable_gsmd_log":"1","enable_hotplug_log":"1","enable_luci_reload_log":"0","enable_sim_switch_log":"0","device_code":"RUT24004XXXX","device_fw_version":"RUT2XX_R_00.01.02.3","routername":"RUT240","hostname":"Teltonika-RUT240.com"}}}]}