Hi,
I am currently using TinyOS-2.0.2 and Micaz-type of motes to implement a
security APPLICATION in a building. We are using a door sensor (Reed
Switch) and Motion Sensor(PIR Sensor) to sense if people are present in
a certain ROOMS and doors are closed when they should be closed. We have
also added a small 8-segment DISPLAY to send some messages to the nodes
in case of an emergency. In total, we have about 20 ROOMS each with its
own ROOM ID and
To send a particular message to a particular node, I am using 'drip' and
in the message I send the node id. At the NODE END, I read the message
and if the source field matches with the TOS_NODE_ID then we process the
packet (I tried implementing TYMO but ending up using drip to do my
application). Now, we have some group of nodes which form a group so
that if an EMERGENCY message is sent, it goes to all these group of
nodes. For this purpose, I have GIVEN them the same TOS_NODE_ID. Now, if
I send a FIRE message through DRIP, it displays correctly on these group
of nodes.
I know dissemination was not designed for this purpose but all the
dissemination actions work correctly but I am observing something weird
WITH CTP (using 'link estimator'. A particular message from a
particular node seems to be receievd multiple times at the Root Node. My
question is that could it be possible that the group of nodes with the
same id is forwarding the same packet again. There are about 10 nodes
with the same id. I would believe that it should not happen like that
because each node in the ctp_data_header carries a unique originSeqno.
If the frame sent on the serial port at the Root Node is the following,
should there not be only one instance of this packet?? DOES THE ROOT
NODE REJECT any packet which is recieved TWICE with the same
originSeqNo????????
typedef nx_struct {
nx_am_addr_t dest;
nx_am_addr_t src;
nx_uint8_t length;
nx_am_group_t group;
nx_am_id_t type;
nx_ctp_options_t options;
nx_uint8_t thl;
nx_uint16_t etx;
nx_am_addr_t origin;
nx_uint8_t originSeqNo;
nx_collection_id_t type;
nx_am_addr_t source;
nx_uint16_t doorevent;
} msg_format_t;
My application is similar to Antitheft where I am interested in sending
only the status of the node, so I do not send items like parent,
hopcount, seqno, etc like in TestNetworkmsg. Should I be sending the
parent in each packet???
I hope I have been able to explain my application/problem
Cheers,
Varun Jain
R&D Embedded System Engineer
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