Press CTRL + Z to send data, CoAP

IoT Modules LPWA Module
1

Hello,

I send 35 bytes of binary data every 30 seconds using CoAP. (BG95-M3)

With “AT+QCOAPSEND” it sometimes sends data successfully and fast with return code: “2.04”, but sometimes it takes a long time, about 10s-30s and sometimes it gets stuck and no result code appears at all.
Signal strength (CSQ): 20 - 31
LTE
How can I fix it? I tested my CoAP server using other clients, it takes 20-60 ms to send data without any problem.

AT+CEREG?
+CEREG: 0,5
AT+QGPSCFG="priority",1
OK
// delay 500 ms here to wait for priority change
AT+QCOAPCFG="pdpcid",0,1
OK
AT+QCOAPCFG="trans",0,2,4
OK
AT+QCOAPOPEN=0,"11.11.11.11",5683
OK
+QCOAPOPEN: 0,0
AT+QCOAPHEADER=0,0,1
OK
AT+QCOAPOPTION=0,0,0,11,"/ps/mytopic"
OK
AT+QCOAPOPTION=0,0,1,12,42 // Content format: application/octet-stream
OK

AT+QCOAPSEND=0,1,2,1,35
> �e�-�i�gm�X3�@�A���`N �� �Blil1)1l <--binary data (length: 35)
OK

// The following QCOAPRECV sometimes appears very fast, sometimes very slow (30s)
// and sometimes not at all, even if I wait so long (75s)
+QCOAPACK: 0,1,0,0
+QCOAPRECV: 0,0,2.04,0,,0,0

AT+QCOAPCLOSE=0
OK
2

UPDATE: It only happens when I switch priorities between GPS and Network.

AT+QGPSCFG="priority",0
AT+QGPSCFG="priority"
+QGPSCFG: "priority",0,4

// Get location here

AT+QGPSCFG="priority",1
AT+QGPSCFG="priority"
+QGPSCFG: "priority",1,3 // 3 Means WWAN is in loaded state. Should I check anything else too?

// Send data here

When I don’t switch between priorities, it is all good. Sends the data successfully everytime. Other than AT+QGPSCFG=“priority”, what else should I check to see if it is ready to send data?

3

If you choose network first, the test is normal, so this event may be related to your configured priority, BG95M3 GPS and network share RF