I have been developing a product which relies on the HL6528 for the past couple of months. There is only one function required, to open a secure tcp connection with kinesis.eu-west-1.amazonaws.com and send data.
I have been accomplishing this with the “Secure client” option on the built in TCP functionality. I have not been uploading my own certificates, not sure if there are built in certs or not.
Up until 2 weeks ago this worked. The secure socket opened, I sent the data and I closed the socket. However 2 weeks ago I ran the same firmware and it no longer works. This is the response I get:
AT+KTCPCNX=1 NO CARRIER +KTCP_NOTIF: 1,5
I have read from the datasheet that KTCP-NOTIF: 5 = “TCP connection error”
Please could I have some more information about how to diagnose this problem. What would be the cause of this TCP connection error? Has anything changed in the past 2 weeks (maybe an OTA firmware upgrade happened without me asking AirVantage to do it?) that would cause this error?