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Broker/Border router is working. I can ping it. I use tunslip6 and connection is established. But, my clients never connect to router. Any help?

Hi

I want to add MQTT in contiki and I followed https://github.com/esar/contiki-mqtt
I created a mqtt-service folder inside contiki/apps/directory and copied the files
How will i add mqtt-service to the APPS variable in application's makefile???

please help

Regards
Nabin Pradhan

Hi

I am trying to test MQTT in contiki using a msp430 mote.
To do that, I use the standard MQTT broker called "Mosquitto" in a computer. And I use the uip6-bridge of Contiki to communicate the 6lowpan sensor network with PC computer.

However, if check the mote sends the first message to establish the TCP connection towards the IPv6 of PC where Mosquitto-broker is running in port 1883. The message is shown by wireshark in the PC.
But there is not any response from Mosquitto-broker.

Please, could you say the broker compatible with the implementation of MQTT in contiki??
How do you test the MQTT client of contiki??

Best regards,
Rafa

What is the license of this project? I do not see this explained anywhere. Can you add one, for instance MIT?

I compiled example.c on my motes and set border router. When i start simulation and
"mosquitto_sub -t '#' -v"
motes send subscribe just once?
i am not sure what to do. Any help?

Hello Esar!

I have made considerable changes on a fork of your code in https://github.com/felipe-lavratti/contiki-mqtt, so now, I come back to discuss what should be merged into your project.

We must not considerer changes made in example.c and README. It is true that it would be of good help if I did some refactoring.

The most important change is the last BUG listed below:

Features added:

• Added support for QOS1 and QOS2 messaging (as long broker is configured with max_inflight_messages = 1)
• Created "mode2" publish interace, used to fill the transmission buffer with a callback.

BUG Fixes

• Fixed a connect case where auto reconnect would stop retrying.
• Fixed TCP data handling methodology: Now received buffer is considered byte-by-byte instead of expecting that a full and single mqtt packet will be received by each read call. In TCP packets, MQTT messages might get joined together by the sender, so payloads must be handled byte-by-byte.

Tell me how do you recommend me to filter code out in order to make a pull request.

Hello,
I am trying to compile the example.c for a Zolertia Z1 mote on the Cooja simulator (Contiki 3.0) but I get the following two errors:

In file included from example.c:1:0:
mqtt-service.h:60:1: error: unknown type name ‘process_event_t’
mqtt-service.h:84:18: error: unknown type name ‘uip_ip6addr_t’

What am I doing wrong?

Also my makefile is the following:

ifndef TARGET
TARGET=z1
endif

all: $(CONTIKI_PROJECT)
APPS= mqtt-service
CONTIKI = ../..
CONTIKI_WITH_RIME = 1
include $(CONTIKI)/Makefile.include