How to Retrieve LQI for End Devices Connected via a Router in a Zigbee Network?

[Dalvadi Anil]

I am using three devices in my Zigbee network:

A Coordinator.
A Router.
An End Device.
When I retrieve the LQI data:

If both the Router and End Device connect directly to the Coordinator, I get the correct LQI values for all devices.
However, if the End Device is connected to the Coordinator via the Router (indirect connection), the LQI value for the End Device is returned as 0.


I'm using the following code to send an LQI request to the Coordinator and process the response:

 

void read_lqi_request()
{
zb_bufid_t buf = zb_buf_get_out();
zb_zdo_mgmt_lqi_param_t *req_param = ZB_BUF_GET_PARAM(buf, zb_zdo_mgmt_lqi_param_t);

req_param->start_index = 0;
req_param->dst_addr = 0x00; // Coordinator's short address

zb_uint8_t tsn = zb_zdo_mgmt_lqi_req(buf, get_lqi_cb);

if (tsn == RET_OK)
{
TRACE_MSG(TRACE_APS1, "LQI request sent successfully", (FMT__0));
}
else
{
TRACE_MSG(TRACE_ERROR, "Failed to send LQI request", (FMT__0));
}
}

void get_lqi_cb(zb_uint8_t param)
{
zb_bufid_t buf = param;
zb_uint8_t *zdp_cmd = zb_buf_begin(buf);
zb_zdo_mgmt_lqi_resp_t *resp = (zb_zdo_mgmt_lqi_resp_t *)(zdp_cmd);
zb_zdo_neighbor_table_record_t *record = (zb_zdo_neighbor_table_record_t *)(resp + 1);
zb_uint_t i;

printf("LQI Callback: status=%d, neighbor_table_entries=%d, start_index=%d, neighbor_table_list_count=%d\n",
resp->status, resp->neighbor_table_entries, resp->start_index, resp->neighbor_table_list_count);

for (i = 0; i < resp->neighbor_table_list_count; i++)
{
printf("Network Addr=%d, Dev Type=%d, RxOnWhenIdle=%d, Relationship=%d, PermitJoin=%d, Depth=%d, LQI=%d\n",
record->network_addr,
ZB_ZDO_RECORD_GET_DEVICE_TYPE(record->type_flags),
ZB_ZDO_RECORD_GET_RX_ON_WHEN_IDLE(record->type_flags),
ZB_ZDO_RECORD_GET_RELATIONSHIP(record->type_flags),
record->permit_join, record->depth, record->lqi);

record++;
}
}

[Edvin]

Hello,

It looks like you are trying to get the LQI of the coordinator from the end device? Are you sure you don't want to do it the other way around? The end device is not aware of the different nodes in the network, other than it's parent, if it is not a router itself. So I believe you should try to measure the LQI of the end device from the coordinator.

Best regards,

Edvin

[Dalvadi Anil]

Hi,

I want to receive end device LQI using coordinator even if the end device is connected through router

[Edvin]

So from your coordinator's application, you should do something like:

void read_lqi_request()
{
zb_bufid_t buf = zb_buf_get_out();
zb_zdo_mgmt_lqi_param_t *req_param = ZB_BUF_GET_PARAM(buf, zb_zdo_mgmt_lqi_param_t);

req_param->start_index = 0;
req_param->dst_addr = <ADDRESS>; // End device's short address. <--- This line

zb_uint8_t tsn = zb_zdo_mgmt_lqi_req(buf, get_lqi_cb);

if (tsn == RET_OK)
{
TRACE_MSG(TRACE_APS1, "LQI request sent successfully", (FMT__0));
}
else
{
TRACE_MSG(TRACE_ERROR, "Failed to send LQI request", (FMT__0));
}
}

void get_lqi_cb(zb_uint8_t param)
{
zb_bufid_t buf = param;
zb_uint8_t *zdp_cmd = zb_buf_begin(buf);
zb_zdo_mgmt_lqi_resp_t *resp = (zb_zdo_mgmt_lqi_resp_t *)(zdp_cmd);
zb_zdo_neighbor_table_record_t *record = (zb_zdo_neighbor_table_record_t *)(resp + 1);
zb_uint_t i;

printf("LQI Callback: status=%d, neighbor_table_entries=%d, start_index=%d, neighbor_table_list_count=%d\n",
resp->status, resp->neighbor_table_entries, resp->start_index, resp->neighbor_table_list_count);

for (i = 0; i < resp->neighbor_table_list_count; i++)
{
printf("Network Addr=%d, Dev Type=%d, RxOnWhenIdle=%d, Relationship=%d, PermitJoin=%d, Depth=%d, LQI=%d\n",
record->network_addr,
ZB_ZDO_RECORD_GET_DEVICE_TYPE(record->type_flags),
ZB_ZDO_RECORD_GET_RX_ON_WHEN_IDLE(record->type_flags),
ZB_ZDO_RECORD_GET_RELATIONSHIP(record->type_flags),
record->permit_join, record->depth, record->lqi);

record++;
}
}

It is your own implementation, but you need to call it from the coordinator, and use the end device's address as the destination address.

Best regards,

Edvin