I've seen this modem mentioned a few times on this list and I'm aware of the cdc_ncm kernel patch, but I am still having trouble with it in ModemManager. The attached patch, huawei-e3276-port-types.diff, allows ModemManager to detect the modem. I think this is safe to push. However, ModemManager is still unable to establish a connection. The attached patch, huawei-e3276-bearer-hacks.diff, allows a connection to be made by forcing ip_type to IPV4 and dropping the encoded_auth parameter to the AT^NDISDUP command, although this is obviously not ideal. I'm not clear on where the ip_type should be set and why it is not. Any suggestions on where to start looking, please? Upon further investigation, I found that the E3276 is happy with encoded_auth set to 1 or 2, but fails with '+CME ERROR: Incorrect parameters' if encoded_auth is set to 0. This behaviour is slightly different to the E1820 and K4605 (E372) which will establish a connection with encoded_auth set to 0, 1 or 2. One solution might be to only add the encoded_auth parameter if it is non-zero. I have tested this with the E3276, E1820 and K4605 and all three modems will establish a connection when sending: AT^NDISDUP=1,1,"internet","","" Are there any objections to this? The output of AT^NDISDUP=? on the E3276 is ^NDISDUP: (1-20),(0-1) Which to me indicates the only parameters are the context ID and the connection state, i.e. AT^NDISDUP=1,1 to connect PDP context 1 and AT^NDISDUP=1,0 to disconnect. The PDP context being defined previously by AT+CGDCONT. However, I have tested on the E3276, E1820 and K4605 and I can confirm that the APN sent in the AT^NDISDUP command overrides what was defined by AT+CGDCONT. The E3276 even updates the value in the PDP context, confirmed by sending AT+CGDCONT? after AT^NDISDUP, although the E1820 and K4605 do not. I suppose we do need to send the extra parameters apn, user, passwd and encoded_auth as I don't know of any other way of specifying the username and password for a non-PPP connection. Another solution then, might be to send AT^NDISDUP=1,1 unless either user or passwd are not empty, in which case we send the longer form AT^NDISDUP=1,1,"apn","user", 'pass" [,encoded_auth != 0]. ________________________________ UNIVERSITY OF CAPE TOWN This e-mail is subject to the UCT ICT policies and e-mail disclaimer published on our website at http://www.uct.ac.za/about/policies/emaildisclaimer/ or obtainable from +27 21 650 9111. This e-mail is intended only for the person(s) to whom it is addressed. If the e-mail has reached you in error, please notify the author. If you are not the intended recipient of the e-mail you may not use, disclose, copy, redirect or print the content. If this e-mail is not related to the business of UCT it is sent by the sender in the sender's individual capacity.
Attachment:
huawei-e3276-port-types.diff
Description: huawei-e3276-port-types.diff
Attachment:
huawei-e3276-bearer-hacks.diff
Description: huawei-e3276-bearer-hacks.diff