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Scenario details:
- We need to access the vending machine RS232 port remotely from the company’s central offices. We will use a SIM card with a fixed IP address and the modem must be always online waiting for connections in the TCP 20010 port
- We need to give access to several maintenance people to the same RS232 port on-location. They have an Android cellphone with Bluetooth Low Energy (BLE) and an app which grants them a Bluetooth BLE connection with the RS232 port of the machine via the MTX
- We’ll be able to access the vending machine from the central offices anytime, and when there’s no connection, any worker will be able to Access via Bluetooth to make readings of the machine
- The friendly name Bluetooth needs to be called: MTXTUNNEL-BLE
Solution: MTX-3G-Java-IoT-N-BLE modem + MTX-Tunnel software
Configuration example (config.txt file) for said scenario:
| Configuration | Observations |
| COMM_baudrate: 9600 COMM_bitsperchar: 8 COMM_autorts: off COMM_autocts: off COMM_stopbits: 1 COMM_parity: none COMM2_baudrate: 115200 COMM2_bitsperchar: 8 COMM2_autorts: off COMM2_autocts: off COMM2_stopbits: 1 COMM2_parity: none GPRS_apn: internetestatico.movistar.es GPRS_login: MOVISTAR GPRS_password: MOVISTAR GPRS_timeout: 0 MTX_PIN: 0000 MTX_model: MTX-3G-Java-IOT-STD-N-BLE MTX_mode: server MTX_portAux: gateway MTX_ping: 30 MTX_pingIP: 8.8.8.8 MTX_urc: on TCP_port: 20010 BLUETOOTH_enabled: on BLUETOOTH_initCommands: AT+NM=MTXTUNNEL-BLE FIREWALL_enabled: off TELNET_enabled: on TELNET_login: user TELNET_password: 1234 TELNET_port: 20023 | Serial port baud rate Number of bits No flow control No flow control stop bit No parity Velocity of the Bluetooth serial port Number of data bits No Bluetooth flow control No Bluetooth flow control 1 stop bit configured No parity bit APN GPRS provided by the GSM operator GPRS Login GPRS Password Modem is always GPRS connected If SIM card doesn’t have PIN, leave as 0000 Modem model We do not want GPRS gateways Serial-Serial gateway necessary for Bluetooth Ping to ensure 3G/GPRS connectivity IP to execute the ping URC messages enabled TCP port waiting for connections Bluetooth activated Configuration parameters Firewall disabled Telnet is activated Login for Telnet Password for Telnet Telnet TCP port |
Details:
- COMM_ parameters refer to the vending machine RS232 serial port configuration. COMM2_ parameters refer to the MTX internal Bluetooth module RS232 port configuration and must be the values shown in the above example
- The serial Bluetooth BLE can be established if there’s not an already established socket (that is, a serial 3G gateway accessing the machine)
Enter the “ethernet” or “modem” connection type:
For an ethernet configuration, make sure the IP parameters are compatible with server access according to the concentrator local network configuration. For an ethernet connection, the configuration must be compatible with the concentrator’s local network topology so that it can access the servers. This configuration is done from the “Networks” configuration page (see section 3.2.2.3: “Networks”).
For a modem connection, the modem configuration must be correct before a connection can be set up. This configuration is done from the “Modem” configuration page (see section 3.2.2.4: “Modem”).
The parameters for the servers to be configured are at least the following:
Therefore the following fields need to be configured: “Interface”, “Type”, “Server type”, “Address”, “Port”, “Login” and “Password”.
The other fields can be left at the default values subject to the directories having been properly created beforehand. See section 3.1.2: “Configuration files” for more details.
Wait. The concentrator will reboot using its factory configuration.
