Allow sending raw AT commands to the modem (#28)

Author: DomAmato

scripts/hologram_modem.py

@@ -17,6 +17,8 @@
 import subprocess
 import time
 
+DEFAULT_TIMEOUT = 5
+
 help_connect = '''This subcommand establishes a cellular connection.\n
 '''
 
@@ -40,6 +42,8 @@
 help_location = '''Print the location of the modem based on cell towers if supported\n
 '''
 
+help_at_command = '''Send an AT command to the modem and print the result'''
+
 help_reset = '''Restart the modem\n'''
 
 help_radio_off = '''Turn off the cellular radio on the modem\n'''
@@ -87,6 +91,17 @@ def run_modem_signal(args):
     else:
         print('Signal strength: ' + str(cloud.network.signal_strength))
 
+def run_at_command(args):
+    cloud = CustomCloud(None, network='cellular')
+    cmd = ''
+    if args['command'] is not None:
+        cmd = args['command'].lstrip("AT")
+    val = None
+    if not cmd.endswith('?') and '=' in cmd:
+        cmd, val = cmd.split('=')
+    result, response = cloud.network.modem.command(cmd, val, timeout=args['timeout'])
+    print('Response: ' + ''.join(map(str, response)) + f'\n{result}')
+
 def run_modem_version(args):
     cloud = CustomCloud(None, network='cellular')
     version = cloud.network.modem.version
@@ -142,6 +157,7 @@ def run_modem_location(args):
 _run_handlers = {
     'modem_connect': run_modem_connect,
     'modem_disconnect': run_modem_disconnect,
+    'modem_command': run_at_command,
     'modem_sim': run_modem_sim,
     'modem_operator': run_modem_operator,
     'modem_signal': run_modem_signal,
@@ -212,6 +228,14 @@ def parse_hologram_modem_args(parser):
     parser_radio_off.set_defaults(command_selected='modem_radio_off')
     parser_radio_off.add_argument('-v', nargs='?', action=VAction, dest='verbose', required=False)
 
+    # at-command
+    parser_command = subparsers.add_parser('command', help=help_at_command)
+    parser_command.set_defaults(command_selected='modem_command')
+    parser_command.add_argument('command', nargs='?', help='AT command to send to the modem')
+    parser_command.add_argument('-t', '--timeout', type=int, default=DEFAULT_TIMEOUT, nargs='?',
+                        help='The period in seconds before the command exits if it doesn\'t receive a response')
+    parser_command.add_argument('-v', nargs='?', action=VAction, dest='verbose', required=False)
+
     # version
     parser_version = subparsers.add_parser('version', help=help_version)
     parser_version.set_defaults(command_selected='modem_version')