Tunnel – Change by SMS of up to 9 digital outputs or 9 relays.

Scenario details:

• You need to be able to change the status of 9 remote relays to enable / disable a number of devices connected to them. Such remote activation needs to be done by SMS messaging
• It should only be possible to change the status of the relays from the authorized telephone numbers: +34666123456, + 34666123457 and +346661234568
• The SMS messages to make the change of state must be simple. Therefore, to activate Relay 0 the SMS message will be “RL0ON” and to deactivate it “RL0OFF”. Exactly the same for the rest of the relays: “RL1ON” / “RL1OFF”, “RL2ON” / “RL2OFF”, … “RL8ON” / “RL8OFF”

Solution: MTX-Tunnel firmware + MTX-IOT-S [4-N]

Configuration example (config.txt file) for the indicated scenario:

Configuration

Observations

MTX_pin: 0000 MTX_model: 199802407 MTX_mode: none SMS_allPhones: off SMS_validPhone1: +34666123456 SMS_validPhone2: +34666123457 SMS_validPhone3: +34666123458 SMS_atEnabled: on SMS_atResponse: on SMS_alias1: RL0ON>AT^MTXTUNNEL=SETIO,0,1 SMS_alias2: RL0OFF>AT^MTXTUNNEL=SETIO,0,0 SMS_alias3: RL1ON>AT^MTXTUNNEL=SETIO,1,1 SMS_alias4: RL1OFF>AT^MTXTUNNEL=SETIO,1,0 SMS_alias5: RL2ON>AT^MTXTUNNEL=SETIO,2,1 SMS_alias6: RL2OFF>AT^MTXTUNNEL=SETIO,2,0 SMS_alias7: RL3ON>AT^MTXTUNNEL=SETIO,3,1 SMS_alias8: RL3OFF>AT^MTXTUNNEL=SETIO,3,0 SMS_alias9: RL4ON>AT^MTXTUNNEL=SETIO,4,1 SMS_alias10: RL4OFF>AT^MTXTUNNEL=SETIO,4,0 SMS_alias11: RL5ON>AT^MTXTUNNEL=SETIO,5,1 SMS_alias12: RL5OFF>AT^MTXTUNNEL=SETIO,5,0 SMS_alias13: RL6ON>AT^MTXTUNNEL=SETIO,6,1 SMS_alias14: RL6OFF>AT^MTXTUNNEL=SETIO,6,0 SMS_alias15: RL7ON>AT^MTXTUNNEL=SETIO,7,1 SMS_alias16: RL7OFF>AT^MTXTUNNEL=SETIO,7,0 SMS_alias17: RL8ON>AT^MTXTUNNEL=SETIO,8,1 SMS_alias18: RL8OFF>AT^MTXTUNNEL=SETIO,8,0 SMS_aliasResponse: result GPIO_mode0: output GPIO_config0: normal GPIO_mode1: output GPIO_config1: normal GPIO_mode2: output GPIO_config2: normal GPIO_mode3: output GPIO_config3: normal GPIO_mode4: output GPIO_config4: normal GPIO_mode5: output GPIO_config5: normal GPIO_mode6: output GPIO_config6: normal GPIO_mode7: output GPIO_config7: normal GPIO_mode8: output GPIO_config8: normal

PIN if it has one Device model Gateways used Phone numbers Phone number 1 Phone number 2 Phone number 3 Remote AT commands Responses to AT commands Alias to activate the relay RL0 Alias to deactivate the relay RL0 Alias to activate the relay RL1 Alias to deactivate the relay RL1 Alias to activate the relay RL2 Alias to deactivate the relay RL2 Alias to activate the relay RL3 Alias to deactivate the relay RL3 Alias to activate the relay RL4 Alias to deactivate the relay RL4 Alias to activate the relay RL5 Alias to deactivate the relay RL5 Alias to activate the relay RL6 Alias to deactivate the relay RL6 Alias to activate the relay RL7 Alias to deactivate the relay RL7 Alias to activate the relay RL8 Alias to deactivate the relay RL8 Not obtain as a response AT command executed GPIO0 configured as an output Configuration as a normal output GPIO1 configured as an output Configuration as a normal output GPIO2 configured as an output Configuration as a normal output GPIO3 configured as an output Configuration as a normal output GPIO4 configured as an output Configuration as a normal output GPIO5 configured as an output Configuration as a normal output GPIO6 configured as an output Configuration as a normal output GPIO7 configured as an output Configuration as a normal output GPIO8 configured as an output Configuration as a normal output

Details:

• The MTX-IOT-S family modems have up to 8 digital outputs (from GPIO0 to GPIO7) and 1 integrated relay (GPIO8). The 8 digital outputs are open collector type with enough current to switch an external relay
• Aliases, for convenience, are not case sensitive. That is, it is the same to send “RL1ON” as “Rl1ON” as “RL1on” or “rl1on”, among other combinations
• If for your application you only need to manage a low power relay (up to 1Amp), the use of GPIO8 is recommended, since it is connected to an internal relay of the MTX-IoT-S