at-command - 尝试在华为 E3531 上使用 AT 命令

Question

我想读取我的华为 E3531 的 RSSI。所以我找到了一些文档，展示了使用 AT 命令获取这些信息的简单方法。问题是我什至无法连接到我的华为 E3531。我的意思是，它作为调制解调器工作得非常好。我有很好的联系。但是当我在 dev 中寻找设备时，我只找到了 2 个设备(“sdb”和“sgm”)，它们似乎是 2 个磁盘，但与串口无关。

所以我尝试了一些我发现的东西:
- 插入华为后，我发现 Idvendor 和 Idproduct 正在执行 lsusb。
- 他们我做了一个 sudo modprobe usbserial vendor=0X"Idvendor"product=0X"Idproduct"
- 然后当我执行 dmesg 时，我可以阅读:

[ 1038.498282] usbcore: registered new interface driver usbserial
[ 1038.498299] usbcore: registered new interface driver usbserial_generic
[ 1038.498312] usbserial: USB Serial support registered for generic

通常我应该有类似的东西:

usb 1-1: generic converter now attached to ttyUSB0

我想我不得不说甚至不可能从我的 mac 上看到 sdb 和 sgm，所以我在我的 Ubuntu 上这样做。如果我启用我的 wifi，调制解调器将无法连接(所以我看不到 sdb 和 sgm)

如果有人需要它，这里是 dmesg 的第一部分:

[  742.756888] usb 3-1: USB disconnect, device number 6
[  743.123706] usb 3-1: new high-speed USB device number 7 using xhci_hcd
[  743.252854] usb 3-1: New USB device found, idVendor=12d1, idProduct=14dc
[  743.252861] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  743.252865] usb 3-1: Product: HUAWEI Mobile
[  743.252868] usb 3-1: Manufacturer: HUAWEI
[  743.482312] cdc_ether 3-1:1.0 usb0: register 'cdc_ether' at usb-0000:00:14.0-1, CDC Ethernet Device, 9a:c2:9b:ee:4c:d9
[  743.482859] usb-storage 3-1:1.2: USB Mass Storage device detected
[  743.483249] scsi11 : usb-storage 3-1:1.2
[  743.520839] audit: type=1400 audit(1427889713.269:79): apparmor="DENIED" operation="file_inherit" profile="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=3414 comm="nm-dhcp-client." lport=29180 family="inet" sock_type="dgram" protocol=17
[  743.520857] audit: type=1400 audit(1427889713.269:80): apparmor="DENIED" operation="file_inherit" profile="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=3414 comm="nm-dhcp-client." lport=47709 family="inet6" sock_type="dgram" protocol=17
[  744.481267] scsi 11:0:0:0: Direct-Access     HUAWEI   TF CARD Storage  2.31 PQ: 0 ANSI: 2
[  744.481722] sd 11:0:0:0: Attached scsi generic sg2 type 0
[  744.482933] sd 11:0:0:0: [sdb] Attached SCSI removable disk
[  753.752310] audit: type=1400 audit(1427889723.496:81): apparmor="DENIED" operation="file_inherit" profile="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=3423 comm="nm-dhcp-client." lport=29180 family="inet" sock_type="dgram" protocol=17
[  753.752328] audit: type=1400 audit(1427889723.496:82): apparmor="DENIED" operation="file_inherit" profile="/usr/lib/NetworkManager/nm-dhcp-client.action" pid=3423 comm="nm-dhcp-client." lport=47709 family="inet6" sock_type="dgram" protocol=17
[ 1038.498282] usbcore: registered new interface driver usbserial
[ 1038.498299] usbcore: registered new interface driver usbserial_generic
[ 1038.498312] usbserial: USB Serial support registered for generic

再次感谢你，如果你能给我一个小小的想法，我会接受的!
再见

编辑 9/04/2015
所以我发现了一些东西。做一个 lsusb 你会看到你的设备:

Bus 003 Device 020: ID 12d1:1f01 Huawei Technologies Co., Ltd.

1f01 是 Idproduct，但它有时会改变，因为调制解调器会自行进入不同的模式。如果是 1F01，请执行:

sudo usb_modeswitch -v 12d1 -p 1F01 -M '55534243123456780000000000000011062000000100000000000000000000' 

这将强制您的设备更改模式。现在你的设备将有一个等于 1001 的 Idproduct。执行 lsusb 来查看它:

Bus 003 Device 023: ID 12d1:1001 Huawei Technologies Co., Ltd. E169/E620/E800 HSDPA Modem

你有 4 个新的 USB 开发:USB0、USB1、USB2 和 USB3。
现在我要尝试使用 minicom 来发送 AT 命令。

Answer 1

所以基本上，我的问题是我无法将调制解调器视为串行。我解释了如何做到这一点，您必须使用以下命令强制调制解调器:

sudo usb_modeswitch -v 12d1 -p 1F01 -M '55534243123456780000000000000011062000000100000000000000000000'

然后我尝试了 Minicom，它非常好，您只需要使用正确的参数(例如波特率和端口)进行良好连接。所以寻找它并做一些测试。要查看您在 minicom 中写入的内容，只需启用本地回显(ctrl+a 然后 z 到选项)。
所以你可以发送你想要的所有信息。

但我想将它集成到一个 python 脚本中，所以这是我的代码:

def terminalComAndRead(a,b) :
    found = False
    proc = subprocess.Popen([a], stdout=subprocess.PIPE, shell=True)#send the command
    (out, err) = proc.communicate()
    string=str(out)
    #print(string)
    foundstring=string.find(b, 0, len(string))#look for the string b in the serial answer of my device
    if foundstring != -1 :
        found= True #send back true if it found it
    return found

def send(data,ser):
    try:
        ser.write(data)#write the command my serail port
    except Exception as e:
        print "Couldn't send data to serial port: %s" % str(e)
    else:
        try:
            sleep(1)
            data = ser.read(1)#read the serial
        except Exception as e:
            print "Couldn't read data from serial port: %s" % str(e)
        else:
            if data:  # If data = None, timeout occurr
                n = ser.inWaiting()
                if n > 0: data += ser.read(n)
                return data

def searchModem():

    foundmob= False
    foundusb= False

    sudoPassword='Figaro5558_'#my sudo password
    command="usb_modeswitch -v 12d1 -p 1f01 -M '55534243123456780000000000000011062000000100000000000000000000'" # the command that for ce the modem to be on serial mode
    while foundusb!= True : # this allows me to look for the modem as an usb and then force it

        foundmob=terminalComAndRead("lsusb",'12d1:1f01')#doing a ls usb and then looking for the id of my device
        changemob=terminalComAndRead("lsusb",'12d1:1001')#this is the id of my device when it is already in serial mode

        if foundmob == True :
            sleep(1)
            os.system('echo %s|sudo -S %s' % (sudoPassword, command))# this is the line who execute the command on sudo

            foundusb=terminalComAndRead("ls /dev/ttyUSB*",'ttyUSB1')


        if changemob == True :
            foundusb=terminalComAndRead("ls /dev/ttyUSB*",'ttyUSB1')

        if foundusb == True :
                print('Modem ready for connection')

    ttyusb0=terminalComAndRead('dmesg | tail -50','now attached to ttyUSB0') #look int he dmesg if there is my new usb port

    if ttyusb0 == True :
        usbPort='/dev/ttyUSB0'#give the path 

    return usbPort

ser = serial.Serial(usbPort, 9600, bytesize=8, parity='N', stopbits=1, timeout=1, rtscts=False, dsrdtr=False) #connect to your serial

cmd="AT^HCSQ?\r\n"#the AT command
msg=str(send(cmd,ser))#use the send function to send the AT command
print(msg)

所以这对我有用，我希望它会帮助你!
干杯