We have migrated from a 3G modem HL8548 chip, to the 4G HL7692.
However, attempting to make a PPP connection always returned zero’s and failed.
We have since managed to get the 4G connection working by setting the PDP context to 2, i.e.
AT+CGDCONT=2,”IP”,”APN”
And dialling:
ATD99**2#
Here is the link on another forum that advises the same:
Can anyone tell me why this works?
Is this is correct?
According to the link above, PDP context 1 is reserved for retrieving an IP address and using it results in a conflict. Is this true? Does this refer to the Default EPS Bearer that is established when attaching to the network?
Why do we have to create another PDP context/Bearer for this to work?
Could this solution cause any other problems?
Thanks