1. in tos_at.h, added int fuzzy_matching; field into at_echo_st struct, if this field is set to K_TRUE, then if echo message contains the string in "echo_expect" field.
2. added __API__ int tos_at_echo_fuzzy_matching_create(at_echo_t *echo, char *buffer, size_t buffer_size, char *echo_expect_contains) api to tos_at.c, which will create an at_echo_t with fuzzy_matching = K_TRUE;
3. added RHF76_ATCMD_SET_DELAY and rhf76_set_delay to RHF76.h to allow set/query RX delay config
4. added RHF76_ATCMD_SET_DATA_RATE and rhf76_set_data_rate to RHF76.h to allow set/query date rate config
5. added rhf76_at_cmd_exe for DEBUG purpose, so that user can execute any AT+ commands they want
6. added code in lora_demo.c to demonstrate package segmentation.
1. remove the old msg queue and queue:
i. msg queue is not a common and reusable/flexible component(need user to config the msg pool size and this componet can only be used by tos_queue)
ii. tos_queue can only deliver the pointer message(cannot do a memory buffer deliver)
2. add ring queue(tos_ring_q) componet
rinq queue can be reused by tos_chr_fifi/tos_msg_q/tos_mail_q as the foundational data container
3. add message queue(tos_msg_q)
a little like the old queue mechanism, supply the capability to deliver a pointer message
4. add mail queue(tos_mail_q)
supply the capability to deliver a memory buffer
5. add binary heap(tos_bin_heap)
the basement componet to implement priority queue
6. add priority queue(tos_prio_q)
can be reused by the priority message/mail queue as the foundational data container.
7. add priority message queue(tos_prio_msg_q)
a message(pointer) deliver mechanism, supply the capability of delivering the message with priority(message with higher priority comes faster to the pender than with lower)
8. add priority mail queue(tos_prio_mail_q)
a mail(memory buffer) deliver mechanism, supply the capability of delivering the mail with priority(mail with higher priority comes faster to the pender than with lower)
