I have used waveshares 5G dongle module with 4G simcard(Airtel) inserted in it of quectel with model RM 500U-EA. Connected the 5 dongle module to Raspberry pi 4 for testing. First of all we switched off the wifi and ensured that there is no netwrk connectivity.Then ensured that “usb-serial” driver program is correctly upload to the module interface, and checked it by the `usb-devices and it shown similar output to the waveshare site of 5G dongle module. Then /dev/ttyUSB* is used to check whether “ttyUSB0~ttyUSB4” is correctly identified. Then installed minicom to test the AT commands. Opened minicom /dev/ttyUSB3 with baudrate 115200 and entered the AT commands and result got was:
AT+QCFG=“usbnet”,3
ok
AT+CGDCONT=1,“IPV4V6”,Airtel APN
ok
AT+CFUN=1,1
ok
After some time the modem startup again and the NET light became on. After that again entered the AT command and response got was:
AT+QENG=“servingcell”
+QENG: “servingcell”,“CONNECT”,“LTE”,“FDD”,404,95,DD2870D,229,265,1,4,4,BE5,-90,-9,-63,2,0,0,28
ok
Then in the terminal entered following commands for getting IP and result got was
command(OUTPUT2.1 IN THE ATTACHED DOCUMENT):
1)sudo dhclient -v usb0
response:
Listening on LPF/usb0/62:e1:08:5f:90:c7
Sending on LPF/usb0/62:e1:08:5f:90:c7
Sending on Socket/Fallback
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 7
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 12
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 9
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 14
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 17
DHCPDISCOVER on usb0 to 255.255.255.255 port 67 interval 2
No DHCPOFFERS received
No working leases in persistent database - sleeping.
command:
2)sudo udhcpc -i usb0
Response:
udhcpc:started,v1.35.0
udhcpc: broadcasting discover
udhcpc: broadcasting discover
udhcpc: broadcasting discover
udhcpc: broadcasting discover
udhcpc: broadcasting discover
and this continues
command:
3)sudo route add -net 0.0.0.0 usb0
when entered this no response was there . Then entered command ifconfig usb0 to check whether usb0 got ip address and it doesn’t got any ip address assigned to it.why?
is there any possible solution to solve this problem.
Please check
AT+QNETDEVCTL?
AT+QENG="servingcell"
AT+QCFG="nat"
For RM500U you need to set up data call with the AT command
AT+QNETDEVCTL=1,1,1 and then it works with dhclient or udhcpc.