MQTT + DASH7 Integration

May 11, 20170 likes7,949 views

An introduction to integrating MQTT with DASH7. Deploying MQTT over DASH7 is not too difficult and we show examples for getting started.

DASH7istheOppositeofTCP
DASH7��s networking technology is different than TCP/IP.?
DASH7 is designed to handle small data, but lots of devices at the same time. ?
TCP/IP handles large data, but only between two devices.
2

DASH7 Handles Connections in Groups
4
? DASH7 devices can do peer-to-
peer, multicast publishing
without a broker.
? QoS is dictated by the manner in
which devices acknowledge
(ACK) the Publisher.
? It��s a lot like peer-to-peer MQTT.
1. Multicast ?
Publish
2, 3, 4. Synchronized ACKs
2
3
4

DASH7 is Like Peer-to-Peer MQTT on a LAN
5
Broker
Unsubscribed?
Client(s) Subscribed?
Client(s)
1. Client publishes on?
topic ��X�� to broker
1
2
3
4
2, 3, 4. Broker forwards Pub (1)?
to all clients subscribed to ��X��,
�� one at a time.
1. Multicast ?
Publish
2, 3, 4. Synchronized ACKs
2
3
4

A Proxy Can Integrate it with Cloud MQTT
6
Broker
Unsubscribed?
Client(s) Subscribed?
Client(s)
1. Client publishes on?
topic ��X�� to broker
1
2
3
4
2, 3, 4. Broker forwards Pub (1)?
to all clients subscribed to ��X��,
�� one at a time.
DASH7 WAN/LAN
Prox
? A DASH7-MQTT Proxy can be just an MQTT Client
that has a second interface on a DASH7 WAN or LAN.
? It forwards pub and sub messages.
? Additional sophistication can make it more ef?cient,
although Topic naming best practices makes a big
improvement with minimal sophistication.

Topic Naming Best Practices
7
Keep topic names below 16 chars.
? e.g. topic/this_is_too_long
? e.g. topic/titl �� (ok)
DASH7 devices have limited communication
bandwidth and memory. Queries work fastest on
strings 16 characters or less.
Use Path separators to de?ne hierarchies
based on data latency requirements.
? e.g. rt/temp
? e.g. noncrit/temp
Here, we have real-time and ��non-critical�� groups of
temperature sensors. This structure allows the
proxy to be more intelligent.
Wildcards are cool.
? e.g. rt/#
? e.g. #/temp �� (not advisable for std MQTT)
DASH7 querying supports wildcards and other
search features. The second topic will bog down a
normal MQTT network, but a DASH7-MQTT proxy
can actually handle it without much drama.
The ��ID/�� topic can be used for addressing
? e.g. ID/# �� (broadcast)
? e.g. ID/0790 �� (16bit LAN address)
? e.g. ID/DA5701A976B31F54 �� (MAC)
This is a way to tunnel direct device addressing
through an MQTT proxy. (And yes, wildcards can
be used with partial addressing)

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MQTT + DASH7 Integration

1. DASH7 with MQTT? [Application Note]

2. DASH7istheOppositeofTCP DASH7��s networking technology is different than TCP/IP.? DASH7 is designed to handle small data, but lots of devices at the same time. ? TCP/IP handles large data, but only between two devices. 2

3. MQTT Handles Connections ��One at a Time�� 3 ? Client connects to MQTT server (called a ��Broker��) ? Client subscribes to some MQTT ��Topics�� (these are like feeds). ? When Broker is supplied new data on a given Topic, it forwards to all subscribers, one at a time. Broker Unsubscribed? Client(s) Subscribed? Client(s) 1. Client publishes on? topic ��X�� to broker 1 2 3 4 2, 3, 4. Broker forwards Pub (1)? to all clients subscribed to ��X��, �� one at a time.

4. DASH7 Handles Connections in Groups 4 ? DASH7 devices can do peer-to- peer, multicast publishing without a broker. ? QoS is dictated by the manner in which devices acknowledge (ACK) the Publisher. ? It��s a lot like peer-to-peer MQTT. 1. Multicast ? Publish 2, 3, 4. Synchronized ACKs 2 3 4

5. DASH7 is Like Peer-to-Peer MQTT on a LAN 5 Broker Unsubscribed? Client(s) Subscribed? Client(s) 1. Client publishes on? topic ��X�� to broker 1 2 3 4 2, 3, 4. Broker forwards Pub (1)? to all clients subscribed to ��X��, �� one at a time. 1. Multicast ? Publish 2, 3, 4. Synchronized ACKs 2 3 4

6. A Proxy Can Integrate it with Cloud MQTT 6 Broker Unsubscribed? Client(s) Subscribed? Client(s) 1. Client publishes on? topic ��X�� to broker 1 2 3 4 2, 3, 4. Broker forwards Pub (1)? to all clients subscribed to ��X��, �� one at a time. DASH7 WAN/LAN Prox ? A DASH7-MQTT Proxy can be just an MQTT Client that has a second interface on a DASH7 WAN or LAN. ? It forwards pub and sub messages. ? Additional sophistication can make it more ef?cient, although Topic naming best practices makes a big improvement with minimal sophistication.

7. Topic Naming Best Practices 7 Keep topic names below 16 chars. ? e.g. topic/this_is_too_long ? e.g. topic/titl �� (ok) DASH7 devices have limited communication bandwidth and memory. Queries work fastest on strings 16 characters or less. Use Path separators to de?ne hierarchies based on data latency requirements. ? e.g. rt/temp ? e.g. noncrit/temp Here, we have real-time and ��non-critical�� groups of temperature sensors. This structure allows the proxy to be more intelligent. Wildcards are cool. ? e.g. rt/# ? e.g. #/temp �� (not advisable for std MQTT) DASH7 querying supports wildcards and other search features. The second topic will bog down a normal MQTT network, but a DASH7-MQTT proxy can actually handle it without much drama. The ��ID/�� topic can be used for addressing ? e.g. ID/# �� (broadcast) ? e.g. ID/0790 �� (16bit LAN address) ? e.g. ID/DA5701A976B31F54 �� (MAC) This is a way to tunnel direct device addressing through an MQTT proxy. (And yes, wildcards can be used with partial addressing)

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