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Python import problems: requests and mraa

Created by: dvelas25 at: 9/7/2018 8:55 PM (15 Replies)

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9/7/2018 8:55 PM	Rate (0)
dvelas25 Posts: 3 Rating: (0)	Hello Siemens community. I'm currently developing a project to upload certain variables from IOT2040 to Thingworx platform using python. For this purpose, I require access to GPIO pins (using mraa) and a REST library (using requests). I have found two (2) problems: If I use python 2.7, the mraa library is working correctly (pre-installed) but if I try to add requests using "pip install requests" or "python -m pip install requests", python throws an error saying that it couldn't import runpy module. I tried various methods to install first pip, which didn't worked and downloading the requests library from github and then executing setup.py (python setup.py), which returns ImportError: No module named setuptools. If I use python 3.5.2, the requests library can be correctly installed using "pip3 install requests". But if I try to install mraa library "pip3 install mraa", it shows the following error: Could not find a version that satisfies the requirement mraa (from versions: ) No matching distribution found for mraa I hope someone can help me out because I require this two things working together (GPIOs and REST with Python).
dvelas25 Posts: 3 Rating: (0)
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9/10/2018 10:51 AM	Rate (0)
Fe_lipe Silver Member Joined: 12/12/2016 Last visit: 4/8/2024 Posts: 640 Rating: (60)	Hello, I recommend using python3, since mraa is preinstalled and supported by python3 in the current master branch. Check out this issue on github for more infos. If you build your own image using the current master branch you should be able to solve your issues. Kind regards!

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9/10/2018 12:22 PM	Rate (0)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Hi, I tried to install mraa for python3 from source, but "import mraa" doesn't work. Maybe I need to adapt some pathes or soemthing, don't know.. Another possibilitiy is to install pip for python2. I had some issues with the python version 2.712. Then I installed python 2.7.15 and ran get-pip.py. The steps are: Download python 2.7.15 as “Gzipped source tarball” Copy it to your IOT2000, e.g to /media cd /media tar xzf Python-2.7.15.tgz cd Python-2.7.15 ./configure make make install After that create a file called "get-pip.py" under /home/root with the content you can copy from here. Then run "python get-pip.py" and pip for python2 will be installed and you can install you required modules (I did not try to install it). That's a way how it should work. The recommended way is to build your own image with the current master branch like Fe_lipe mentioned. Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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9/11/2018 4:55 PM	Rate (0)
dvelas25 Posts: 3 Rating: (0)	Thanks for your answers. I tried building myself the OS image from github page. Now I'm facing problems with internet in the yocto linux... If I try to issue for example "npm install node-red-contrib-s7" I got the following error: 18 http request GET https://registry.npmjs.org/node-red-contrib-s7 19 info retry will retry, error on last attempt: Error: getaddrinfo EAI_AGAIN registry.npmjs.org:443 If I try to install requests using "pip3 install requests" I got the following error: Retrying (Retry(total=4, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0xb632682c>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/requests/ Retrying (Retry(total=3, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0xb6326c0c>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/requests/ Retrying (Retry(total=2, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0xb6326b4c>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/requests/ Retrying (Retry(total=1, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0xb6326fcc>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/requests/ Retrying (Retry(total=0, connect=None, read=None, redirect=None)) after connection broken by 'NewConnectionError('<pip._vendor.requests.packages.urllib3.connection.VerifiedHTTPSConnection object at 0xb6326b0c>: Failed to establish a new connection: [Errno -3] Temporary failure in name resolution',)': /simple/requests/ Could not find a version that satisfies the requirement requests (from versions: ) No matching distribution found for requests If I try to "ping www.google.com" I got this error: ping: bad address 'www.google.com' If I use "ifconfig -a" I got this results: eth0 Link encap:Ethernet HWaddr E0:DC:A0:3C:62:5F inet addr:192.168.200.1 Bcast:0.0.0.0 Mask:255.255.255.0 inet6 addr: fe80::e2dc:a0ff:fe3c:625f%134535408/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3760 errors:0 dropped:0 overruns:0 frame:0 TX packets:1789 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:578218 (564.6 KiB) TX bytes:348738 (340.5 KiB) Interrupt:48 Base address:0x8000 eth1 Link encap:Ethernet HWaddr E0:DC:A0:3C:62:60 inet6 addr: fe80::e2dc:a0ff:fe3c:6260%134535408/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3159 errors:0 dropped:0 overruns:0 frame:0 TX packets:8 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:569871 (556.5 KiB) TX bytes:648 (648.0 B) Interrupt:49 Base address:0xc000 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: ::1%134535408/128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric:1 RX packets:224 errors:0 dropped:0 overruns:0 frame:0 TX packets:224 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:15984 (15.6 KiB) TX bytes:15984 (15.6 KiB) sit0 Link encap:IPv6-in-IPv4 NOARP MTU:1480 Metric:1 RX packets:0 errors:0 dropped:0 overruns:0 frame:0 TX packets:0 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1 RX bytes:0 (0.0 B) TX bytes:0 (0.0 B) I don't know what to do, any solution for this? Example image 2.2.0 had the problems I mentioned at the beginning of this post and now latest image that I built with github and kas is facing internet problems. I hope that you could help me find any solution or idea for this IOT2040 module.
dvelas25 Posts: 3 Rating: (0)	Last edited by: dvelas25 at: 9/11/2018 4:56:24 PM
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9/12/2018 7:16 AM	Rate (0)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	OK, this is now a networking problem. Are you using dhcp on the second interface (eth1)? If so, you might be affected by a similar issue as reported and resolved in https://github.com/siemens/meta-iot2000/issues/93.

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9/12/2018 9:18 AM	Rate (1)
bergmanu Platinum Member Joined: 4/28/2015 Last visit: 11/12/2024 Posts: 3345 Rating: (379)	Hi, I can confirm that with the github image mraa works for python3. I also have the dhcp problem. Workaround until it is fixed that worked for me: Open /etc/network/interfaces and add the last line in the box to the eth1 part. auto eth1 iface eth1 inet dhcp pre-up /sbin/udhcpc -R -b -p /var/run/udhcpc.eth1.pid -i eth1 -O 1 3 4 5 6 12 After that type in /etc/init.d/networking restart and you will have access to the internet. After a reboot the DNS configuration is gone so you will have to do /etc/init.d/networking restart after each reboot. I also had succes in installing requests with pip3 install requests Best regards!
	Not working for IOT2050 support anymore from March 1st, 2024. I really enjoyed the time supporting you! :)
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9/28/2018 8:56 AM	Rate (0)
106xsi Posts: 6 Rating: (0)	Should this solution also work for wlan0 interface? best regards Alex
106xsi Posts: 6 Rating: (0)
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9/28/2018 7:34 PM	Rate (0)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	That networking issue should be fixed with this commit: https://github.com/siemens/meta-iot2000/commit/aae68ced5962c7806f26eef0a14187957d92945d.

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9/29/2018 8:11 PM	Rate (0)
106xsi Posts: 6 Rating: (0)	Thank you for the quick fix i will test it and give you feedback if it works. Added 30.9.2018: Tested it today Wlan0 does not connect after reboot. Below you can see part of the DMESG output and i had to "unblock" the device. [ 229.380212] usb 1-1: new high-speed USB device number 4 using ehci-pci [ 229.718366] usbcore: registered new interface driver brcmfmac [ 230.141448] brcmfmac: brcmf_c_preinit_dcmds: Firmware version = wl0: Apr 3 2014 04:43:32 version 6.10.198.66 (r467479) FWID 01-32bd010e [ 230.192064] brcmfmac: brcmf_cfg80211_reg_notifier: not a ISO3166 code root@iot2000:~# rfkill list 0: phy0: wlan Soft blocked: yes Hard blocked: no root@iot2000:~# rfkill unblock wlan root@iot2000:~# ifup wlan0 Successfully initialized wpa_supplicant udhcpc (v1.24.1) started Sending discover... Sending discover... Sending select for 10.0.0.20... Lease of 10.0.0.20 obtained, lease time 864000 /etc/udhcpc.d/50default: Adding DNS 10.0.0.1 root@iot2000: After this wlan0 seems to work until the next reboot. I use a raspberry pi wifi usb dongle.
106xsi Posts: 6 Rating: (0)	Last edited by: 106xsi at: 9/30/2018 9:31:05 PM
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10/1/2018 3:20 PM	Rate (0)
jan-k Silver Member Joined: 4/28/2015 Last visit: 6/28/2024 Posts: 578 Rating: (43)	How do you trigger the reboot? Via software (reboot command), or simply by pressing the reset button? I'm wondering if some magic (though I do not find any ATM) tries to shutdown "cleanly" and issues rfkill soft-block during shutdown. Will try to reproduce.

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